THE CACTACEAE DESCRIPTIONS AND ILLUSTRATIONS OF PLANTS OF THE CACTUS FAMILY BY N. L. BRITTON anp J. N. ROSE VotumE I Tue CaRNEGIE INSTITUTION OF WASHINGTON A Cactus Desert in Arizona. Photograph by D. T. McDougal. THE CACTACEAE DESCRIPTIONS AND ILLUSTRATIONS OF PLANTS OF THE CACTUS FAMILY BY N. L. BRITTON anp J. N. ROSE a Volume LI . Tue CarneciE InstiruTIoN oF WASHINGTON tte Wasuincton, 1919 aN CARNEGIE INSTITUTION OF WASHINGTON PUBLICATION No. 248, VoLumE I Copies of this Boek were first issued JUN 21 i9fe PRESS OF GIBSON BROTHERS WASHINGTON Introduction...... . Order Cactales..... Family Cactaceae. . CONTENTS. CC Ce ee Key to Tribes........... 0... cece cee eee eee ee Tribe Pereskieae........... 0.0... cece cee eee ——~ Pereskia...... cee ee cee tenes Key to Species... 20... .. 0c cece ee eee eee Tribe Opuntieae... 00.0... eee eee ee Key to Genera........ 2... cece cece ce eeees Pereskiopsis........... 00 e cece cee e cece eee Pterocactus....... 0.0... eee e ee eee eee Opuntia..... ccc cece ee eee ees Key to Subgenera and Series.............. Subgenus Cylindropuntia................. Series Ramosissimae.................-- Series Leptocaules..............-.--6-- Series Thurberianae.................... Series Echinocarpae..............000005 Series Bigelovianae.................--5 Series Imbricatae...............00.005- Series Fulgidae...............-0 00-0 eee Series Vestitae......... 0.0.0 e eee eee Series Clavarioides..............-2..00.- Series Salmianae...............00 0 ee eee Series Subulatae................0000 00 Series Miquelianae...................4. Series Clavatae......... 0... cece eee eee Subgenus Tephrocactus..............506- Series Weberianae................0.005. Series Floccosae..........-. eee eee 4s Series Glomeratae............2-0-2-000- Series Pentlandianae................... PAGE. Family Cactaceae—continued. Tribe Opuntieae—continued. Opuntia—continued. Subgenus Platyopuntia................... 99 Series Pumilae... 0.0.0.0... cece ee eee 100 Series Curassavica€........... 0.000 c eee 102 Series Aurantiacae...............0.000 106 Series Tunae......... 0.0... cee cece eee 110 Series Basilares............. 0.000 ce eeee 118 Series Inamoenae................0.0005 125 Series Tortispinae.................0025 126 Series Sulphureae.......... 0.020.002 eee 133 Series Strigiles.......... 0... ...0 cee euee 136 Series Setispinae........... 00... cece eee 136 Series Phaeacanthae................... 139 Series Elatiores..............0.000ceuee 149 Series Elatae............. 0... cece eee 156 Series Scheerianae.................00.- 159 Series Dillenianae...................... 159 Series Macdougalianae ................. 169 Series Tomentosae.................000- 172 Series Leucotrichae.............0..0005 174 Series Orbiculatae.................008. 176 Series Ficus-indicae .................00. “4377 Series Streptacanthae.................. 181 Series Robustae............ 2.0. c cece 191 Series Polyacanthae.................... 193 Series Stenopetalae.................... 200 Series Palmadorae.................0005 201 Series Spinosissimae.................00- 202 Series Brasilienses.................0005 209 Series Ammophilae.................... 211 Series Chaffeyanae..................... 213 Grusonia... 0... cece eee eee tees 215 Appendix......... 0... c cee eee eee eee eee e eee 216 Index... 0... ccc cece cnet eeee . 227 PLATE I. PLATE 2. PLATE 3. PLATE 4. PLATE 5 PLATE 6. PLATE 7. PLATE 8. PLATE 9. PLATE 10. PLATE II. PLATE 12. PLATE 13. PLATE 14. PLATE 15. PLATE 16. PLATE 17. PLATE 18. PLATE Ig. PLATE 20. PLATE 21. PLATE 22. PLATE 23. PLATE 24. PLATE 25. PLATE 26. PLATE 27. PLATE 28. PLATE 29. PLATE 30. PLATE 31. PLATE 32. PLATE 33. PLATE 34. PLATE 35. PLATE 36. ILLUSTRATIONS. (1) Flowering joint of Opuntia spinosissima. Longitudinal section of flower of Op Opuntia spinosissima. (2, 3) Single flower of Opuntia spinosissima. (4, 5) untia spinosissima. (6) Cross-section of ovary of (7) Style of Opuntia spinosissima FACING PLATES _PAGE Cactus Desert in Arizona......... 0. eee cece eee eee ees oe ee eee ete Frontispiece (1) Flowering branch of Pereskia pereskia. (2 and 3) F ruit of Pereskia pereskia. (4) Leafy branch of Pereskia sacharosa (5) Proliferous fruit of Pereskia sacharosa. . weet e ees beeen seen ees 10 (1) Flowering branch of Pereskia grandifolia. (2) Leafy branch of Pereskiopsis chapistle. (3) Leafy branch of Pereskiopsis pititache........ cece eee eee eee e cence eee eens settee 20 (1) Upper part of flowering joint of Nopalea cochenillifera. (2) Upper part of flowering joint of Nopalea auberi. (3) Fruit of Nopalea auberi. (4) Flowering joint of Nopalea dejecta..... 34 . Nopalea auberi as it grows near Mitla, Mexico.............-..00e0+s eee ees bette tenes 38 (1 and 2) Branch of Opuntia mortolensis. (3 and 4) Branch of Opuntia leptocaulis. (5) Flowering branch of Opuntia arbuscula. (6) Flowering branch of Opuntia kleiniae cece eee eee eens 48 (1) Leafy branch of Opuntia kleiniae. (2) Terminal branch of Opuntia vivipara. (3) Branch of Opuntia parryi. (4) Flowering branch of Opuntia echinocarpa. (5) Fruiting branch of Opuntia versicolor. ...... 0... ee ee teen eee e eee e nent eee e eens 50 (1) Type plant of Opuntia vivipara, near Tucson, Arizona. (2) A much branched plant of Opuntia OSs 6) (0) C0) 52 (1) Joint of Opuntia tetracantha. (2, 3, 4, 5) Flowering joint of Opuntia versicolor. (6) Proliferous fruits of Opuntia fulgida....... 0... ee eee eee ne ene e eee neenee 54 (1) Joint of Opuntia tunicata. (2, 3, 4, 5) Joint of Opuntia spinosior..... 0.0.5... 66 (1) Leafy branch of Opuntia imbricata. (2) Flowering branch of Opuntia prolifera. (3, 4) Form of Opuntia alcahes. (5, 6) Opuntia vestita... 0.0... cece cee eee eee teen e ene 68 (1) Clump of plants of Opuntia fulgida. (2) A very open plant of Opuntia spinosior.............. 70 (1) Opuntia exaltata as seen in the highlands of Peru. (2) Clump of Opuntia floccosa as it grows in the valleys of the Andes of eastern Perul....... 0... eee eee e eee enes 76 (1) Flowering branch of Opuntia burrageana. (2) Opuntia cylindrica. (3, 4) Joint of Opuntia stanlyi. (5) Flowering joint of Opuntia macrorhiza........ 0.0... cee ce eee nees 78 (1, 2) Part of joint of Opuntia exaltata. (3) Upper part of joint of Opuntia macrarthra. (4) Upper part of joint of Opuntia tortispina...... 0. ec ce cnc ee eee eee eee eens 80 (1) Top of Opuntia miquelii. (2) Old and young joints of Opuntia invicta. (3) Upper part of joint of Opuntia ignescens.... 2.0... cee eect e eee teen ete teen ee te teenies 98 (1) Joint of Opuntia pascoensis. (2) Joints of Opuntia taylori. (3, 4) Form of Opuntia repens. (5) Flower of Opuntia repens. (6) Flowering joint of Opuntia drummondii............... 102 (1) Two plants of Opuntia drummondii. (2) Joints of Opuntia retrorsa with flower. (3) Joints of Opuntia triacantha. (4) Joint of Opuntia jamaicensis. (5) Section of fruit of Opuntia _ JAMAICENSIS. ee ee ec cece e ence eee teen tent eee ee ne eeeeee 104 (1) Plant of Opuntia jamaicensis. (2, 3) Flower of Opuntia jamaicensis. (4) Longitudinal section of flower of Opuntia jamaicensis. (5, 6) Stamen of Opuntia jamaicensis. (7) Style of Opuntia jamaicensis........ 0... ccc cece cece cece ee eeeeeeneeeaunnteeneeees 112 (1) Flowering joint of Opuntia decumbens. (2) Fruiting joint of Opuntia decumbens. (3) Hybrid 116 Group of hardy Opuntia, mostly Opuntia tortispina, in grounds of New York Botanical Garden.... 126 (1) Joints of Opuntia microdasys. (2) Flowering joint of Opuntia macrarthra. (3) Fruit of Opuntia macrarthra. (4) Seed of Opuntia macrarthra. (5) Flowering joint of Opuntia opuntia..... 128 (1) Flowering joint of Opuntia fuscoatra. (2) Upper part of joint of Opuntia sulphurea. (3) Joint of Opuntia tenuispina......... 0000 ccc cece cece cece ceuececbeeetnvatennsnees 132 (1) Plant of Opuntia santa-rita. (2) Plant of Opuntia discata.......... 000 cc ceeccecccueeeuces 142 (1) Flowering joint of Opuntia atrispina. (2) Flowering joint of Opuntia phaeacantha. (3) Upper part of joint of Opuntia engelmannii.......... 0.00000 e eee eeeeeeens 144 (1) Flowering joint of Opuntia bergeriana. (2) Flowering joint of Opuntia elatior. (3) Flowering joint of Opuntia boldinghii. (4, 5) Joint of Opuntia clata..........00.0 00.0 cece eee eee ees 152 (1) Upper part of fruiting joint of Opuntia schumannii. (2) Flower of Opuntia schumannii. (3) Flowering joint of Opuntia vulgaris. (4) Flowering joint of Opuntia stricta.............. 156 (1) Flowering joint of Opuntia laevis. (2) Flowering joint of Opuntia dillenii. (3) Upper part of flowering joint of Opuntia aciculata.... 2... ccc cece ccc ucccueeueeuenaeees 160 (1) View of Opuntia keyensis. (2) View of Opuntia dillenii...............................0 162 Flowering joint of Opuntia linguiformis. 0.0... cece ccc cece ec ce cece ccceeeeeees 164 Flowering joints of Opuntia lindheimeri. (1) Orange-flowered race. (2) Red-flowered race........ 166 (t) Upper part of flowering joint of Opuntia leptocarpa. (2) Fruit of Opuntia leptocarpa. (3) Flower- a) U ing joint ! Opuntia velutina. (4) Upper part of joint of Opuntia megacantha............ 172 ae part o pont of Opuntia tomentosa. (2) Flowering joint of Opuntia brasiliensis. (3) (1) Part of soint 5 manch of Opuntia brasiliensis. (4) Joint of Grusonia bradtiana............... 174 Joint of Opuntia leucotricha, (2) Part of joint of Opuntia maxima. (3) Joint of Opuntia lasiz . 2 a) PI asiacantha. (4) Joint of Opuntia robusta... 00... 0. oe eee ccc c le cece ee cece eee. 180 I ant of Opuntia fragilis. (2) Flowering branch of Opuntia rhodantha. (3) Flowering joint of Opuntia polyacantha................................ 194 204 FIG. THE CACTACEAE. TEXT-FIGURES. PAGE 1. Hedge of Pereskia pereskia............ 7 2. Tree of Pereskia autumnalis............ II 3. Branches of Pereskia autumnalis........ 12 4. Branch of Pereskia lychnidiflora........ 12 5. Leafy branch of Pereskia nicoyana...... 13 6. Branch of Pereskia zehntneri........... 13 7. Cultivated plant of Pereskia zehntneri. . 14 8. Herbarium specimen of Pereskia moorei. 15 g. Tree of Pereskia guamacho............. 15 10. Flowering branch of Pereskia guamacho. 16 11. Leafy branch and flower of Pereskia colombiana ................0.0 0000s 17 12. Branch and fruit of Pereskia bleo....... 18 13. Fruit of Pereskia bahiensis............. 19 14. Leafy branch of Pereskia bahiensis...... 19 15. Tree of Pereskia bahiensis.............. 20 16. Hedge containing Pereskia grandifolia... 21 17. Branch of Pereskia zinniaeflora......... 21 18. Tree of Pereskia cubensis.............. 22 19. Leafy branch of Pereskia cubensis....... 22 20. Branch and fruit of Pereskia portulaci- 10) 0 23 21. Potted plant grown from a cutting of Pereskiopsis velutina............... 26 22. Branch of Pereskiopsis diguetii......... 27 23. Branch of Pereskiopsis opuntiaeflora .... 27 24. Branch of Pereskiopsis rotundifolia...... 27 25. Shows aclump of Pereskiopsis rotundi- folia... 2. eee ee nee 28 26. Branch of Pereskiopsis porteri.......... 28 27. Branch of Pereskiopsis aquosa.......... 29 28. Leaf of Pereskiopsis kellermanii......... 30 29. Leaf of Pereskiopsis kellermanii......... 30 30. Leaf of Pereskiopsis kellermanii......... 30 31. Seed of Pterocactus hickenii............ 31 32. Plant of Pterocactus hickenii........... 31 33. Branch of Pterocactus fischeri.......... 31 34. Seed of Pterocactus fischeri............. 31 35. Seed of Pterocactus pumilus............ 31 36. Seed of Pterocactus tuberosus.......... 31 37. Plant of Pterocactus tuberosus, showing a very large root.............000000+ 32 38. Potted plant of Pterocactus tuberosus... 33 39. Joint of Nopalea guatemalensis......... 35 40. Joint of Nopalea lutea................. 35 41. Large plant of Nopalea dejecta......... 36 42. Joints of Nopalea dejecta.............. 37 43. Joints of Nopalea karwinskiana......... 37 44. Joint of Nopalea inaperta.............. 37 45. Flower of Tacinga funalis.............. 38 46. Longitudinal section of flower of Tacinga funalis.... 2.0.0... ee eee ee eee 38 47. Section of stem of Tacinga funalis...... 38 48. Tip of young branch of Tacinga funalis. 38 49. Plant of Tacinga funalis, climbing over bushes... 0.2.2.2... 00 eee eee eee 39 50. Plant of Maihuenia valentinil.......... 40 51. Fruit of Maihuenia poeppigii........... 41 52. Joint and flower of Maihuenia brachydel- PHYS... oe eee 41 53. Plant of Maihuenia tehuelches.......... 4! 54. Branch of Opuntia ramossissima . 46 55. Section of stem of Opuntia ramosissima. 46 56. Plant of Opuntia leptocaulis. . 48 FIG. V PAGE. . Section of stem of Opuntia leptocaulis’.. 48 . Joint of Opuntia caribaea............. 48 . Thicket formed of Opuntia caribaea..... 49 . Clump of Opuntia arbuscula............ 50 . Plant of Opuntia arbuscula............. 51 . Fruiting branch of Opuntia arbuscula... 51 . Flowering branch of Opuntia thurberi... 53 . Branch of Opuntia davisii.............. 55 . Branch of Opuntia viridiflora........... 55 . Branch of Opuntia whipplei............ 55 . Plant of Opuntia acanthocarpa......... 56 . Joint of Opuntia serpentina............ 58 . Plant of Opuntia bigelovil.............. 59 . Joint of Opuntia bigelovii.............. 59 . Potted plant of Opuntia ciribe.......... 60 . Joint of Opuntia ciribe..............0.. 60 . Potted plant of Opuntia cholla.......... 61 . Joint of Opuntia cholla................ 62 . Proliferous fruits of Opuntia cholla, devel- oping new joints..................... 62 . Proliferous fruits of Opuntia cholla, developing new joints................ 62 . Joints of Opuntia loydii................ 63 . Plant of Opuntia lloydii............... 63 . Plant of Opuntia imbricata............. 64 . Potted plant of Opuntia tunicata....... 65 . Plant of Opuntia pallida............... 65 . Potted plant of Opuntia molesta........ 67 . Joint of Opuntia prolifera.............. 69 . Potted plant of Opuntia prolifera....... 70 . Potted plant of Opuntia alcahes........ 70 . Joint of Opuntia verschaffeltii.......... 72 . Grafted plants of Opuntia clavarioides... 73 . Potted plant of Opuntia salmiana....... 74 . Joints of Opuntia salmiana............. 74 . Potted plant of Opuntia subulata....... 76 . Joint of Opuntia pachypus............. 77 . Joints of Opuntia schottii.............,. 81 . Joints of Opuntia clavata.............. 81 . Joints of Opuntia parishii.............. 82 . Joints of Opuntia pulchella............. 82 . Plants of Opuntia vilis...........0.0... 83 . Joints and cluster of spines of Opuntia bulbispina............0........0.00. 83 . Joints of Opuntia grahamii............. 84 . Plants of Opuntia weberi.............. 84 . Joints of Opuntia weberi............... 85 . Potted plant of Opuntia floccosa....... 86 . Mound of Opuntia lagopus............. 88 . Root, joints, and flower of O. australis. . 88 . Joints of Opuntia glomerata............ 89 . Joint of Opuntia aoracantha............ gt . Joint of Opuntia rauppiana............. 92 . Flowering plant and fruit of Opuntia sub- terranea....... ee eee 2 Joints of Opuntia hickenii.............. 92 Joint of Opuntia darwinii.............. 94 Joints of Opuntia atacamensis.......... 04 . Joints of Opuntia russellii. 94 . Joints of Opuntia ovata. .. Leas 95 . Potted plant of Opuntia sphacrica. Lees 96 . Joint of Opuntia skottsbergii..........., 97 . Joint of Opuntia nigrispina............. 97 . Joint of Opuntia pentlandii............. 97 VI Fic. 117. 118. 119. 120. 121. 122. 123. 124. 125. 126. 127. 128. 129. 130. 131. 132. 133. 134. 135. 136. 137. 138. 139. 140. 141. 142. 143. 144. 145. 146. 147. 148. 149. 150. I5I. 152. 153. 154. 155. 156. 157. 158. 159. 160. 161. 162. 163. 164. 165. 166. 167. 168. 169. 170. 171. 172. 173. 174. 175. 176. 177. 178. 179. 180. 181. 182. 183. 184. THE CACTACEAE. TEXT-FIGURES—continued. PAGE. Joints of Opuntia pentlandii............ 98 Joint of Opuntia ignescens............. 98 Mound of Opuntia ignescens........... 98 Plant of Opuntia campestris............ 99 Joints of Opuntia ignota............... 99 Thicket of Opuntia pumila............. 100 Joints of Opuntia pumila............... 101 Joints of Opuntia pubescens............ 101 Joints of Opuntia curassavica........... 102 Joints of Opuntia borinquensis.......... 104 Joints of Opuntia militaris............. 104 Joints and flower of Opuntia tracyi..... 105 Joints and flowers of Opuntia pusilla.... 106 Joints of Opuntia aurantiaca........... 107 Potted plant of Opuntia schickendantzii. 107 Plant of Opuntia kiska-loro............ 108 Joints of Opuntia canina............... 108 Plant of Opuntia retrorsa.............. 109 Plant of Opuntia utkilio............... 110 Joints of Opuntia anacantha............ 110 Thicket of Opuntia bella............... II Joints of Opuntia bella................ 112 Joint of Opuntia bella... ..0......0.000. 112 Plant of Opuntia triacantha............ 113 Plant of Opuntia tuna................. 114 Joints of Opuntia tuna................. 114 Thicket of Opuntia antillana........... 115 Joints of Opuntia antillana............. 115 Plant of Opuntia decumbens........... 117 Plant of Opuntia depressa.............. 118 Joints of Opuntia lubrica............... 119 Landscape showing Opuntia treleasei.... 119 Joints of Opuntia basilaris............. 120 Plant of Opuntia microdasys........... 121 Potted plant of Opuntia, probable hybrid 121 Joint of Opuntia macrocalyx........... 122 Plant of Opuntia rufida................ 122 Plant of Opuntia pycnantha............ 123 Potted plant of Opuntia comonduensis.. 124 Plant of Opuntia inamoena............. 125 Joint of Opuntia inamoena............. 125 Joints of Opuntia allairei............... 126 Joints of Opuntia pollardii............. 126 Plant of Opuntia opuntia.............. 128 Fruit of Opuntia grandiflora............ 129 Flowering joint of Opuntia grandiflora. . 129 Flowering joints of Opuntia austrina.... 1 30 Joints, flower, and fruit of O. plumbea. . 131 Fruit of Opuntia stenochila............. 132 Fruit of Opuntia stenochila............. 132 Joint of Opuntia stenochila............. 132 Potted plant of Opuntia delicata........ 133 Joint of Opuntia soehrensii............. 135 Joint of Opuntia microdisca............ 135 Joints of Opuntia strigil................ 136 Joints of Opuntia ballii................ 137 Joints of Opuntia pottsii............... 138 Joint of Opuntia setispina.............. 138 Plant and fruit of Opuntia mackensensii 139 Joint of Opuntia macrocentra.......... 140 Joint of Opuntia tardospina............, 141 Cluster of spines of Opuntia gosseliniana 141 Joint of Opuntia gosseliniana..... 141 Joint of Opuntia angustata............. 142 Plant of Opuntia azurea............... 143 Joints of Opuntia azurea............._. 143 Joint of Opuntia covillei..........0.... 145 Joint of Opuntia covillei............ 2. 145 Fic. 185 186. 187. 188. 189. 190. IgI. 192. 193. 194. 195. 196. 197. 198. 199. 200. 201. 202. 203. 204. 205. 206. 207. 208. 209. 210. 211. 212. 213. 214. 215. 216. 217. 218. 219. 220. 221. 222. 223. 224. 225. 226. 227. 228. 229. 230. 231. 232. 233. 234. 235. 236. 237. 238. 239. 240. 241. 242. 243. 244. 245. 246. 247. 248. 249. PAGE. Joint of Opuntia vaseyi................ 146 Potted plant of Opuntia occidentalis.... 147 Joint of Opuntia brunnescens........... 150 Fruit of Opuntia brunnescens........... 150 Joint of Opuntia galapageia............ 150 Flower of Opuntia galapageia........... 150 Joint and cluster of spines of Opuntia galapageia....... cc eee ee ce eee 151 Flowering joint of Opuntia delaetiana.. 152 Joints of Opuntia hanburyana.......... 154 Joint of Opuntia quitensis............. 154 Joint of Opuntia distans............... 155 Joint of Opuntia elata................. 157 Joints of Opuntia cardiosperma......... 157 Joint of Opuntia scheeri............... 159 Plant of Opuntia chlorotica............ 160 Joints of Opuntia chlorotica............ 160 Plant of Opuntia dillenii............... 162 Joint of Opuntia tapona............... 164 Potted plant of Opuntia littoralis....... 164 Joints of Opuntia cantabrigiensis........ 167 Part of joint and cluster of spines of Opuntia procumbens................. 167 Joint of Opuntia cafiada............... 167 Joint of Opuntia pyriformis............ 168 Joint of Opuntia durangensis........... 169 Plant of Opuntia macdougaliana........ 170 Potted plant of Opuntia macdougaliana. 171 Joint of Opuntia wilcoxii............... 172 Plant of Opuntia tomentosa............ 173 Joint of Opuntia tomentella............ 174 Potted plant of Opuntia leucotricha..... 175 Joints of Opuntia orbiculata............ 176 Potted plant of Opuntia pilifera......... 177 Plants of Opuntia ficus-indica.......... 178 Fruit of Opuntia ficus-indica........... 178 Plant of Opuntia crassa................ 179 Potted plant of Opuntia maxima........ 180 Joint of Opuntia spinulifera............ 182 Joint of Opuntia lasiacantha............ 183 Joint of Opuntia zacuapanensis......... 183 Joint of Opuntia hyptiacantha.......... 183 Joint of Opuntia streptacantha......... 184 Potted plant of Opuntia megacantha.... 185 Plants of Opuntia megacantha.......... 186 Joint of Opuntia megacantha........... 186 Joint of Opuntia deamii................ 187 Joint of Opuntia eichlamii.............. 188 Joint of Opuntia inaequilateralis........ 188 Joint of Opuntia pittieri............... 189 Joint of Opuntia cordobensis........... 189 Fruit of Opuntia cordobensis........... 189 Joint of Opuntia quimilo............... 190 Fruit of Opuntia quimilo............... 190 Joint and flowers of Opuntia quimilo.... 191 Plant of Opuntia robusta.............. 192 Plant of Opuntia fragilis............... 194 Joints of Opuntia arenaria............. 195 Joint of Opuntia trichophora........... 195 Plant of Opuntia erinacea...... 196 Joint of Opuntia juniperina............ 197 Seed of Opuntia juniperina............. 197 Joint of Opuntia hystricina............. 197 Joint of Opuntia sphaerocarpa.......... 198 Joints of Opuntia polyacantha.......... 199 Joint of Opuntia stenopetala........... 200 Upper part of joint and flower of Opuntia stenopetala i 2? FIG. 250. 251. 252. 253. 254. 255- 256. 257. 258. 259. 260. 261. 262. 263. 264. 265. 266. 267. 268. 269. 270. 271. 272. 273. 274. 275. 276. THE CACTACEAE. TEX T-FIGURES—continued. Plants of Opuntia palmadora.......... Joints of Opuntia palmadora........... Plants of Opuntia nashii............... Potted plant of Opuntia nashii.......... Joint of Opuntia bahamana............. Flower of Opuntia bahamana........... Plants of Opuntia macracantha......... Potted plant of Opuntia macracantha.. . Potted plant of Opuntia spinosissima.... Plants of Opuntia millspaughii.......... Plant of Opuntia moniliformis.......... Plant of Opuntia moniliformis.......... Plant of Opuntia moniliformis.......... Plants of Opuntia rubescens............ Plants of Opuntia rubescens............ Proliferous fruits of Opuntia rubescens. . Joint of Opuntia rubescens.............. Fruit of Opuntia brasiliensis............ Plant of Opuntia brasiliensis............ Branch of Opuntia bahiensis............ Joint and fruit of Opuntia bahiensis..... Plant of Opuntia bahiensis............. Plant of Opuntia ammophila........... Fruiting joint of Opuntia ammophila.... Flower of Opuntia argentina........... Potted plant of Opuntia chaffeyi........ Plant of Opuntia chaffeyi............... PAGE. F1G.277. 278. 279. 280. 281. 282. 283. 284. 285. 286. 287. 288. 289. 290. 291. 292. 293. 294. 295. 296. 297. 298. 299. 300. 301. 302. Small joint of Nopalea gaumeri......... Elongated joint of Nopalea gaumeri.... Plant of Opuntia depauperata.......... Joint of Opuntia depauperata.......... Plant of Opuntia pestifer.............. Plant of Opuntia discolor.............. Joints of Opuntia pestifer.............. Joint of Opuntia discolor............... Joint of Opuntia guatemalensis......... Joint of Opuntia pennellii.............. Joints of Opuntia caracasana........... Plant of Opuntia aequatorialis.......... Joints of Opuntia aequatorialis......... Joints of Opuntia lata..........0.00.... Fruits of Opuntia lata.............00... Joint with flower of Opuntia macateci... Joint of Opuntia macateei.............. Plants of Opuntia soederstromiana...... Plants of Opuntia zebrina.............. Fruit of Opuntia zebrina............... Plants of Opuntia keyensis............. Section of flower of Opuntia keyensis.... Flower of Opuntia keyensis............. Joint of Opuntia bonplandii............ Plant of Opuntia dobbieana............ Plant of Opuntia dobbieana (without legend). a ey VII THE CACTACEAE Descriptions and Illustrations of Plants of the Cactus Family THE CACTACEAE. INTRODUCTION. The writers began field, greenhouse, and herbarium studies of the Cactaceae in 1904 and in the years following they made studies and collections over wide areas in the United States, Mexico, and the West Indies. It was first intended that these should be followed by a general description of the North American species only, but a plan for a more complete investigation of the family was proposed by Dr. D. ‘T. MacDougal in January 1911. This was approved by the trustees of the Carnegie Institution of Washington at its next regular meeting and a grant was made to cover the expenses of such an investigation. Dr. Rose was given temporary leave of absence from his position as Associate Curator in charge of the Division of Plants, United States National Museum, and became a Research Associate in the Carnegie Institution of Washington, with William R. Fitch and Paul G. Russell as assistants; Dr. Britton, Director-in-Chief of the New York Botanical Garden, was appointed an honorary Research Associate, while R. S. Williams, of the New York Botanical Garden, was detailed to select and preserve the specimens for illustration. Work under this new arrangement was begun January 15, 1912, and thus several lines of investigation were undertaken in a comprehensive way. 1. Reexamination of type specimens and of all original descriptions: This was necessary because descriptions had been incorrectly interpreted, plants had been wrongly identified, and the errors perpetuated; thus the published geographical distribution of many species was faulty and conclusions based on such data were unreliable. Not only had specific names been transferred to plants to which they did not belong, but generic names were interchanged and the laws of priority ignored. Many valid species, too, had dropped out of collections and out of current literature and had to be restored. 2. Assembling of large collections for greenhouse and herbarium use: Extensive greenhouse facilities were furnished by the New York Botanical Garden and the United States Department of Agriculture, while the herbaria and libraries of the United States National Museum and of the New York Botanical Garden furnished the bases for the researches. The New York Botanical Garden has also cooperated in contributing funds in aid of the field operations, in clerical work, and a large number of the illustrations used have been made there, the paintings and line drawings mostly by Miss Mary E. Eaton. 3. Extensive field operations in the arid parts of both Americas: Many of these deserts are almost inaccessible, while the plants are bulky and if not handled care- fully are easily destroyed. Many plants require several years to mature, in some cases many years to flower in cultivation. Through these explorations were obtained the living material for the greenhouse collections and for exchange purposes, as well as herbarium material for permanent preservation. Of much importance, also, were field observations upon the plants as individuals, their form, habit, habitat, and their relations to other species. 3 4 THE CACTACEAE. Early in 1912 Dr. Rose went to Europe to study the collections there and to arrange for exchanges with various botanical institutions having collections of these plants. He spent considerable time at London, mainly at the Royal Botanic Gardens, Kew, where through the courtesy of the Director, Sir David Prain, he was able to examine the greenhouse, illustrative, and herbarium material for which this institution has long been famed. ‘The collection at the British Museum of Natural History and that of the Linnaean Society of London were examined. At Paris he studied the collections at the Natural History Museum, many of which have historic interest; one of his interesting discoveries there was that the Pereskia bleo, collected by Baron Friedrich Alexander von Humboldt in Colombia, is a very different species from the plant which for nearly a century has been passing in our collections and literature under that name. He also visited the famous botanical garden of the late Sir Thomas Hanbury, at La Mortola, Italy, and through the courtesy of Lady Hanbury was given every possible facility for the study of this collection; Mr. Alwin Berger, who was then curator in charge, had brought together one of the most extensive representations of this family to be found growing in the open in any place in the world. Here in the delightful climate of the Riviera were grown many species which were apparently just as much at home as they would have been in their desert habitats. Dr. Rose also visited Rome, Naples, Venice, and Florence, where he saw smaller collections in parks and private gardens. At Munich he examined certain types in the Royal Botanical Museum, then under the charge of Dr. L. Radlkofer, and saw some interesting species in the Royal Botanical Garden then being organized by Dr. K. Goebel. At Berlin he examined the herbarium and living specimens in the Berlin Botanical Garden, through the courtesy of Dr. A. Engler, and the West Indian collection through the courtesy of Dr. I. Urban. He then went to Halle and saw L. Quehl’s collection of mammillarias; to Erfurt, where he saw the Haage and Schmidt, and Haage Jr. collections; to Darmstadt to see the Botanical Garden under Dr. J. A. Purpus; and to Antwerp to see DeLaet’s private collection. In 1913 Dr. Britton and Dr. Rose visited the West Indies. Dr. Britton, who was accompanied by Mrs. E. G. Britton, Miss D. W. Marble, and Dr. J. A. Shafer, collected on St. Thomas and the other Virgin Islands, Porto Rico, and Curacao. At the latter island he rediscovered the very rare Cactus mammillaris, which had not been im cuyation cr many years. Dr. Rose, who was accompanied by William Coie St Chien , ; Russell, also stopped at St. Thomas, and collected on St. ot. pher, Antigua, and Santo Domingo. John F Can, ana oe eritton again visited Porto Rico and, assisted by Mr. vnct and the sat ee ewardson Brown, explored the entire southwestern arid s Desecheo, Mona, and Muertos. In 1914 Dr. Rose went to the west coast of at Jamaica and Panama. Peru, central Bolivi South America, making short stops a made extensive collections in central and southern a, and northern and central Chile. At Santiaso. Chil , ba qe *) e : “ 5 , Cs he examined a number of Philippi’s types in the National Museum and obtained some rare specimens from the B i Sohrens otanical Garden through the courtesy of Johannes INTRODUCTION. 5 In 1915 Dr. Rose, accompanied by Paul G. Russell, visited Brazil and Argentina on the east coast of South America, collecting extensively in the semiarid parts of Bahia, Brazil, and in the region about Rio de Janeiro, so rich in epiphytic cacti. In the deserts about Mendoza and Cérdoba, in Argentina, collections were also made. Here he also arranged for exchanges with the leading botanists and collec- tors. The following persons have made valuable contributions from the regions visited: Dr. Leo Zehntner, Joazeiro, Brazil; Dr. Alberto Lofgren, Rio de Janeiro, Brazil; Dr. Carlos Spegazzini, La Plata, Argentina; Dr. Cristébal M. Hicken, Buenos Aires, Argentina; and Dr. Carlos S. Reed, Mendoza, Argentina. In October and November 1916, Dr. Rose, accompanied by Mrs. Rose, visited Curacao and Venezuela, studying especially the cactus deserts about La Guaira and Puerto Cabello. A number of photographs were taken by Mrs. Rose. While en route for Venezuela, arrangements were made with Mr. Harold G. Foss to make a collection of cacti at Coro, Venezuela. Among the specimens obtained were species not found farther east in Venezuela, so far as known. In 1916 Dr. Britton, assisted by Mr. Percy Wilson, studied the cacti of Havana and Matanzas Provinces and those of the Isle of Pines, Cuba. In 1918 Dr. Rose, assisted by George Rose, visited Ecuador on behalf of the United States Department of Agriculture, aided by the Gray Herbarium of Har- vard University and the New York Botanical Garden; about thirty rare or little- known species were obtained. Through the expenditure of about $2,400, contributed by Dr. Britton, a very important collection of cacti was made by Dr. J. A. Shafer during a six months’ exploration from November 1916 to April 1917 of the desert regions of northwestern Argentina, southeastern Bolivia, northeastern Argentina, and adjacent Uruguay and Paraguay. Fortunately, for the purposes of this work, this collection was brought back to New York by Dr. Shafer in time for the information yielded by it and by his field observations to be used in the manuscript. It has given us first-hand information concerning over 120 species of cacti as to which we have previously known little. There are still a few cactus regions which ought to be explored, but the following summary will show the wide field from which we have obtained information. Our field investigations have covered practically all the cactus deserts of Mexico. The most important of these are the vicinities of Tehuacan and Tomellin, the plains of San Luis Potosi, the chalky hills surrounding Ixmiquilpan, the lava fields in the Valley of Mexico and above Cuernavaca, the deserts of Querétaro, the west coast of Mexico extending from the United States border to Acaponeta, and the seacoasts and islands of Lower California. Other regions in Mexico containing cacti, but not in such great abundance as the foregoing, are those about Pachuca, Oaxaca City, Mitla, Jalapa, Iguala, Chihuahua City, and Guadalajara. All the work in Mexico, however, was done prior to 1912, for, owing to political disturb- ances, no field work there has been feasible since that time. In the United States our work has extended over the cactus regions of Florida, Texas, New Mexico, Arizona, southern California, western Kansas, and south- eastern Colorado. 6 THE CACTACEAE. In the West Indies we have explored all of the Greater Antilles, the Bahamas, the Virgin Islands, St. Christopher, Antigua, Barbados, and Curacao. In South America our field study included the most important deserts of Peru, Bolivia, and Chile, and parts of Brazil, Venezuela, Ecuador, and Argentina. The cactus deserts of South America are so extensive and so remote from one another that it was possible to visit only a part of them in the four seasons allowed for their exploration. Among many enthusiastic volunteers whose contributions of specimens and data have greatly supplemented our own collections and field studies, the following deserve especial mention: Mr. Henry Pittier has made valuable sendings from Colombia, Venezuela, Panama, Costa Rica, and Mexico; Mr. O. F. Cook, from Guatemala and Peru; Mr. G. N. Collins, the late Federico Eichlam, Mr. R. H. Peters, Mr. C. C. Deam, Mrs. T. D. A. Cockerell, Baron H. von Tiirckheim, and the late Professor W. A. Kellerman have sent important collections from Guatemala; Mr. A. Tonduz, Mr. Otén Jiménez, Dr. A. Alfaro, Mr. C. Wercklé, and Mr. Alfred Brade, local collectors and naturalists in Costa Rica, have sent much good material from their country; Mr. William R. Maxon has sent new and rare material from Costa Rica, Guatemala, and Cuba; Professor C. Conzatti and his son, Professor Hugo Conzatti, Dr. C. A. Purpus, Dr. Elswood Chaffey, Mrs. Irene Vera, M. Albert de Lautreppe, and the late Mr. E. A. H. Tays have sent us many interesting specimens from Mexico; Mr. W.E. Safford made a valuable collection in Mexico in 1907; E. W. Nelson and E. A. Goldman, who have collected so extensively in Mexico and the Southwest, have obtained many herbarium and living specimens for our use; Mrs. Gaillard, who lived at Panama several years while the late Colonel D. D. Gaillard was a member of the Isthmian Canal Commission, collected interesting cacti, including Epiphyllum gaillardae; the late Dr. H. EK. Hasse sent specimens from southern California and Arizona; C. R. Orcutt, the well-known cactus fancier, has aided us In many ways besides sending us specimens from his collections; Dr. R. E. Kunze has frequently sent specimens, especially from Arizona: General T imothy FE. Wilcox, for whom Wilcoxia was named, has sent us specimens from the Southwest, while his son, Dr. G. B. Wilcox, contributed several sendings from the west coast of Mexico and Guatemala; Dr. D. T. MacDougal has sent many specimens from all over the Southwest, especially from Mexico, Arizona, and southern California; ne nas — Mas contin se remote deserts, which have yielded interesting ) ; y excellent photographs, quite a number of which are reproduced in this report (Plate 1, etc.). Professor F. E. Lloyd, while located nd fa and neta ses Nex, mace saree collections of living, herbarium, photographs. Dr. Forrest Shreve has ‘sent vain acid alk Sketches, and Arizona and Mr. W. H. Long from New M ico: My am Beals yom none Schaller have furnished interesting speci pre ene E euler enaes be fornia species; Professor J.J Thoraber has my fe ‘laabe tain “ti Souter ne and notes from Arirong : a 7 a as made valuable contributions of material ; - M. E. Jones, Mr. I. Tidestrom, Mr. Thomas H. INTRODUCTION. 7 Kearney, and Professor A. O. Garrett have all sent specimens from Utah; Profes- sor T. D. A. Cockerell and Mr. Merritt Cary have sent specimens from Colorado; Dr. P. A. Rydberg has brought many specimens from the Rocky Mountain region; Messrs. Paul C. Standley, EF. O. Wooton, Vernon Bailey, and H. L. Shantz have sent specimens from the southwestern United States; Brother Leén, of the Colegio de la Salle, Havana, and Dr. Juan T. Roig, of the Estacién Agrondémica, Santiago de las Vegas, Cuba, have contributed Cuban specimens, and Dr. J. A. Shafer has collected widely in Cuba; Mr. William Harris, of Hope Gardens, Jamaica, has col- lected for us in Jamaica; Dr. John K. Small has obtained collections from nearly all over the southeastern United States, aided by Mr. Charles Deering. Dr. Henry H. Rusby and Dr. Francis W. Pennell have contributed plants and specimens from Colombia, collected in 1917 and 1918. Mr. Frederick V. Coville, of the United States Department of Agriculture, has made many valuable suggestions during the progress of the investigation. In our studies we have also had use of the cacti of the following American collections: Herbarium of the Missouri Botanical Garden at St. Louis; the Gray Herbarium of Harvard University; the Rocky Mountain Herbarium at Laramie, Wyoming; the collection of the United States Department of Agriculture; the herbarium of the University of California, especially the Brandegee collection; and the herbarium of the Field Museum of Natural History. The types of the new species described in this work are deposited in the herbaria of the New York Botanical Garden and the United States National Museum, unless otherwise indicated. In greenhouse collections many kinds of cacti grow very slowly, and flower only after many years’ cultivation. We have a number of plants of this kind from various parts of America. It is hoped that some of them may bloom during the period of publication of this book and thus enable us to include them in an appendix. Fic. 1.—Pereskia pereskia. Grown as a hedge. 8 THE CACTACEAE. Order CACTALES. Perennial, succulent plants, various in habit, mostly very spiny, characterized by specialized organs termed areoles. Leaves usually none, except in Pereskia and Pereskiopsis, where they are large and flat but fleshy, and in Opuntia and its relatives, where they are usually much reduced and mostly caducous, terete, or subulate. Spines very various in size, form, arrangement, and color, sometimes with definite sheaths. The areoles are peculiar and complex organs, situated in the axils of leaves when leaves are present, and bearing the branches, flowers, spines, glochids, hairs, or glands; in some genera two kinds of areoles occur, either distinct or united by a groove. Flowers usually perfect, either regular or irregular, usually solitary but sometimes clustered, sometimes borne in a specialized terminal dense inflorescence called a cephalium; perianth-tube none, or large and long, the limb spreading or erect, short or elongated, the lobes few or numerous, often inter- grading in shape and color, but sometimes sharply differentiated into sepals and petals; stamens commonly numerous, elongated or short, sometimes clustered in series, the filaments usually borne on the throat of the perianth, the small oblong anthers 2-celled; style one, terminal, short or elongated; stigma-lobes 2 to many, usually slender; ovary 1-celled, distinct, or immersed in a branch or forming a part of a branch; ovules numerous. Fruit a berry, often juicy and sometimes edible, sometimes dry, in one species described as capsular and dehiscing by an operculum, in others opening by a basal pore. Seeds various; cotyledons two, accumbent, sometimes minute knobs, often broad or elongated; endosperm little or copious; radicle terete. The order consists of the following family only: Family CACTACEAE Lindley, Nat. Syst. ed. 2. 53. 1836. Characters of the order as given above. The family is composed of three tribes. KEY To TRIBES. Leaves broad, flat; glochids wanting; flowers stalked (sometimes short-stalked), often clustered Leaves (except in Pereskiopsis) terete flowers sessile. Areoles with glochids (except in Mathuenia); vegetative parts bearin small and fugacious; flowers rotate (petals erect in Nopalea) Areoles without glochids; usually no leaves on the vegetative par with definite tubes (except Rhipsalis) g leaves, which are usually occ c ec eee eee cece eee eee 2. Opuntieae ts (except cotyledonary); flowers eee eee eee cece e teen een eeeeee 3. Cereeae Tribe 1. PERESKIEAE. Stems and foliage as in other dicotyledonous plants; flowers more or less stalked, their parts all distinct; gloc testa of seed thin, brittle. inflorescence in some species compound; hids wanting; ovule with short funicle; The genus Pereskia, the only representative of this tribe, is, on account of its similarity to other woody flowering plants, considered the nearest cactus relative to the other families, but this relationship is in all cases remote. The nearest generic relatives of Pereskia in the cactus family are doubtless the following: Pereskiopsis, some of whose species were first assigned to the genus Pereskia, but they have different foliage and the areoles often bear glochids. Opuntia, whose species have leaves, though much reduced and usually caducous, other- wise very different ; but some of the species of Opuntia were first referred to Pereskia. Mathuenta (two of whose species have only recently been taken out of Pereskia), whose seeds are similar but the areoles lack glochids, otherwise very different. This tribe has a wide geographic distribution, but is found wild only in the tropics. [7)- ¢ ils of the leaves, neither sheathed nor barbed: glochids (found only in the Opuntieae) wanting; leaves alternate, broad, flat, deciduous, or somewhat fleshy ; wheel-shaped; stamens numerous: shell, the embryo strongly curved ; Lees 1. Pereskieae PERESKIA. 9 Type species: Cactus pereskia Linnaeus. In 1808 about 25 names had been proposed in Pereskia, but, in his monograph published that year, Karl Schumann accepted only 11 species. Several new ones have been proposed since the publication of Schumann’s monograph. The species are native in Mexico, the West Indies, Central America, and South America. Some of the species are much used as stocks for growing the various forms of Zygocactus, Epiphyllum, and other cacti requiring this treatment; P. pereskia is most used and P. grandifolia next. Several species are widely cultivated as ornamentals in tropical regions; they do not flower freely under glass in northern latitudes. All species studied by us in the living state grow readily from cuttings. The typical species seems to have been first introduced into Europe from the West Indies in the latter part of the sixteenth century. A straight-spined species was first described and figured by L. Plukenet in 1696, who called it a portulaca, and the next year by Commerson as an apple (Malus). In 1703 C. Plumier described the genus Pereskzia, basing it upon a single species. The genus was repeatedly recognized by Linnaeus in his earlier publications, and by some pre-Linnaean botanists, but in 1753 Linnaeus merged it into Cactus along with a number of other old and well-established genera; but it was retained by Philip Miller in 1754 in the fourth edition (abridged) of his Gardeners’ Dic- tionary and has since been generally recognized as a genus by botanical and horticultural authors. The name is variously spelled Pezrescia, Peireskia, Perescia, and Pereskia. Named for Nicolas Claude Fabry de Peirese (1580-1637). KEy TO SPECIES. Climbing vines, the twigs with a short pair of reflexed spines from each areole, the stem with acicular spines (Series 1. Typicae)........-5 6.6.0 e eee eee 1. P. pereskia Shrub or trees with slender straight spines (Series 2. Grandifoliae). Petals toothed or fimbriate. Petals somewhat toothed..........060 cece eee ett ene eee e eee 2. P. autumnalis Petals fimbriate. Species from Mexico; ovary turbinate.. 0... ett ee eee 3. P.lvchnidiflora Species from Costa Rica; ovary pyriform. 2.66 eee 4. P. nicoyana Petals entire, at least not fimbriate. Branches and leaves very easily detached. .... 6... 5.0.5 See 5. P. zehntneri Branches and leaves not easily detached. Axils of sepals bearing long hairs and bristles. Leaves lanceolate... 2.0... 00 e ec cece e etree tenet een n nes 6. P. sacharosa Leaves orbicular. 2.0.2.0 02 nee eee eee sess 7. P. mooret Axils of sepals not bearing long hairs and bristles. Flowers white... 0.0.00 e cece eee teeter tet enn n eerste ener ease eannes 8. P. weberiana Flowers not white. Petals yellow. Leaves lan eolate to oblong or obovate. .... 6-6. seer eee eet eee 9. P. guamacho Leaves orbicular or broadly ovate..... 6... 60-0 e eee reer eee e es 10. P. colombiana Petals red or purple. ; Spines few Or NOME... 6... eee eens 11. P. tampicana Very spiny, at least on old branches. Flowers terminal. lowers panicled. Fruit naked, broadly truncate. . 0.0.6... 6550s eee eee ees 12. P. bleo Fruit leaf-bearing, not truncate. Leaves of ovary cuneate at base... 2-2... eee eee eee eee 13. P. bahiensis Leaves of ovary broad at base.... 6.0... 00-5 e eee e seen 14. P. grandifolia Flowers solitary... 2... 00-0 cece eee e rete nett nent e eens 15. P. sinniaeflora Flowers usually axillary and solitary. Leaves 1 cm. long or longer, obtuse or acute. Flowers 2 to 5 together, 1 cm. long; South American species.... 16. P. horrida Flowers solitary, 1.5 em. long; petals elliptic-obovate; Cuban SPECIES... eee eee teen ence ete ce ees 17. P. cubensis Leaves emarginate, 1 cm. long or less, petals obovate.......-...-. 18. P. portulacifolia Affinity unknown. .........0000020 00s eee ce essen ersten ens e nse s sess eee e sees eee 19. P. conzattii 10 THE CACTACEAE. Series 1. TYPICAE. Consists of only the typical species, which is widely distributed, and much cultivated through- out tropical America. Schumann regarded it as a subgenus under the name Eupereskia. 7 7 1. Pereskia pereskia (Linnaeus) Karsten, Deutsch. Flora 888. 1882. Cactus pereskia Linnaeus, Sp. Pl. 469. 1753. - ‘ } Pereskia aculeata Miller, Gard. Dict. ed. 8. 1768. - 7 Cactus lucidus Salisbury, Prodr. 349. 1796. p Pereskia lcengispina Haworth, Syn. Pl. Succ. 178. 1812. Pereskia aculeata longispina De Candolle, Prodr. 3: 475. 1828. Pereskia fragrans Lemaire, Hort. Univ. 2: 40. 1841. Pereskia undulata Lemaire, Ilustr. Hort. 5: Misc. 11. 1858. poix — Pereskia foetens Spegazzini in Weingart, Monatsschr. Kakteenk. 14: 134. 1904. Pereskia godseffiana Sander, Gard. Chron. III. 43: 257. 1908. Shrub, at first erect, but the branches often long, clambering, and forming vines 3 to 10 meters long; spines on lower part of stem solitary or 2 or 3 together, slender and straight; spines in the axils of the leaves paired, rarely in threes, short, recurved; leaves short-petioled, lanceolate to oblong, or ovate, short-acuminate at the apex, tapering or rounded at base, 7 cm. long or less; flowers in panicles or corymbs, white, pale yellow, or pinkish, 2.5 to 4.5 cm. broad; ovary leafy and often spiny; fruit light yellow, 1.5 to 2 cm. in diameter, when mature quite smooth; seeds black, somewhat flattened, 4 to 5 mm. in diameter; hilum basal, circular, depressed, or crater-shaped. The plant and fruit have several common names, one of which, blade apple, was in use as early as 1697. Lemon vine, Barbados gooseberry, and West Indian gooseberry are three others, with various French and Dutch modifications. In Argentina it is called sacharosa, according to Sir Joseph Hooker (Curtis’s Bot. Mag. 116: pl. 7147), but this name is prop- erly applied only to the P. sacharosa of Grisebach, native of Argentina, a distinct species, which Hooker thought identical with this. . 7 The berries are eaten throughout the West Indies and the leaves are used as a pot herb ' in Brazil. The species was in cultivation in the Royal Gardens of Hampton Court in 1696 i and has been at Kew ever since its establishment in 1760, but did not flower until 1889. In Washington we have one plant among a dozen which flowers abundantly each year; three plants at New York bloom annually. _ In tropical America the plant climbs over walls, rocks, and trees, and at flowering time is covered with showy, fragrant blossoms, followed by beautiful clusters of yellow berries. In La Plata it is grown sometimes for hedges (see fig. 1), but its strong, almost offensive i odor makes it objectionable for growing near habitations. 1 Type locality: Tropical America. Distribution : West Indies and along the east and north coasts of South America; found also in Florida and Mexico, but perhaps only as an escape; widely grown for its fruit. This species consists of several races, differing in shape and size of the leaves and in color of the flowers. One of these races, with ovate-orbicular leaves rounded at the base, had heretofore been known to us only in cultivation, but in October 1916, while collecting in Venezuela, Dr. Rose found this broad-leafed form common in the coastal thickets near Puerto Cabello. Pereskia lanceolata (Forster, Handb. Cact. 513. 1846), P. acardia Parmentier (Pleiffer, Enum. Cact. 176. 1837), and P. brasiliensis Pfeiffer (Enum. Cact. 176. 1837), usually referred as synonyms of P. aculeata, were not formally published in the places above cited. fan vcolaie Proves (num ed on the shape of the leaves, are recorded under P. aculeata: name only): mum. Cact. 176. 1837); latifolia Salm-Dyck (Hort. Dyck. 202. 1834, y); rotundifolia Pfeiffer (Enum. Cact. 176. 1837); rotunda (Suppl. Dict. Gard. Nicholson 589. 1901) is perhaps the same as rotundtfolia. | . . Pereskia aculeata rubescens Pfeiffer (Enum. Cact. 176 green leaves above, tinged with red beneath. ) Chron the last belongs Pereskia godseffiana, described as a sport in the Gardeners’ in 1908. It is a very attractive greenhouse plant, often forming a round, 1837) is described with glaucous- BRITTON AND ROSE PLATE ‘M. E. Eaton del, A MOEN & CO. 1. Flowering branch of Pereskia pereskia. 4. Leafy branch of Pereskia sacharosa. 2,3. Fruits of the same. ; 5. Proliferous fruit of the same. (All natural size.) PERESKIA. tI densely branched bush, but is sometimes grown as a climber, as a basket plant, or in the form of a pyramid. It is especially distinguished by the rich coloration of the leaves, which are variously mottled or blotched above with crimson, apricot-yellow, and green, but of a uniform purplish crimson beneath. We have seen this form in the New York Botanical Garden, where it is grown only as a bush. It was exhibited first at Ghent, Belgium, in 1908, and is supposed to have originated in Queensland, Australia. Illustrations: Stand. Cycl. Hort. Bailey 5: pl. 87; Blithende Kakteen 2: pl. 86; Bot. Reg. 23: pl. 1928; Curtis’s Bot. Mag. 116: pl. 7147; Gard. Chron. III. 29: f. 61; Plumier, Nov. Pl. Amer. pl. 26, in part; Safford, Ann. Rep. Smiths. Inst. 1908: f. 10; Schumann, Gesamtb. Fic. 2.—Pereskia autumnalis. Kakteen f. 109, all as P. aculeata. Descourtilz, Fl. Med. Antill. ed. 2. 4: pl. 294, as Cactier a Fruits Feuilles; Vellozo, Fl. Flum. 5: pl. 26, as Cactus pereskia; Gard. Chron. IIT. 43: f. 114, as P. godseffiana. . ; Plate 1, figure 1, of this volume is a flowering branch of a plant at the New York Bo- tanical Garden obtained from M. Simon, of St. Ouen, Paris, France, in 1901; figure 2, fruit of same plant; figure 3, fruit of another plant. Text-figure 1, from a photograph taken by Paul G. Russell at La Plata, Argentina, in September 1915, shows the plant used as a hedge. Series 2. GRANDIFOLIAE. In this series we include 18 species, all tropical American, both continental and insular. Schumann, regarding the series as a subgenus, applied to it the name A hoplocarpus. 2. Pereskia autumnalis (Eichlam) Rose, Contr. U.S. Nat. Herb. 12: 399. 1909. Pereskiopsis autumnalis Eichlam, Monatsschr. Kakteenk. 19:22. 1909. Tree, 6 to 9 meters high, with a large, round, much branched top, the trunk usually very definite ? . . 2 a . - . ve and 4o cm. or more in diameter, often covered with a formidable array of spines; young branches 12 THE CACTACEAE. cherry-brown, smooth; spines in the axils of the leaves usually solitary, sometimes in threes, long and slender, 3 to 4 cm., rarely 16 cm. long; leaves thickish, oblong to orbicular, 4 to 8 cm. long, rounded or somewhat narrowed at base, mucronately tipped; flowers solitary, near the tops of the branches, short-peduncled; ovary covered with leafy scales; flowers 4 to 5 cm. broad; petals entire, orange- colored; stamens numerous; fruit globular, 4 to 5 cm. in diameter, fleshy, glabrous, bearing small, scattered leaves, these naked in the axils; seeds black, glossy, 4 mm. long. Type locality: In Guatemala. Distribution: Widely distributed in Guatemala, usually at an altitude of 120 to 300 meters; but we do not know of its occurrence elsewhere. oe ~L) ™ ~~ ae a on “, “ Fic. 3.—Pereskia autumnalis. Xo.5. Fic. 4.—Pereskia lychnidiflora. Tr plant, 80 far as we know, has no common name and no use is made of its fruit. “e08. Hstrations. | Sout U.S. Nat. Herb. 12: pl. 52 to 54; Safford, Ann. Rep. Smiths. Inst. 906: pl. 10, 1. 1; Monatsschr. Kakteenk. 21: 37, the last as Pereskiopsis autumnalis. Text-figures 2 and 3 are copi . . pied from the above-cited il : . photographs were obtained by O. F. Cook in Guatemala. eg Mlustrations. ‘The original 3. Pereskia lychnidiflora De Candolle, Prodr. 32475. 1828. Evidently Le . a oblong oolnte a tree " parub; branches cylindric, woody; leaves large, 4 to 7 cm. long, oval to bearing a stout spine’. “d at pase, sessile, fleshy, with a prominent midvein; axils of leaves each “ ; spine 2 to 5 cm. long and sever irs: a re 5 al long hairs; flowers large, 6 cm. broad, solitary, borne at the ends of short, s . ; short, stout branches: petals BS turbinate, bearing small leaves, hes; petals broadly cuneate, laciniate at the apex; ovary Type locality: In Mexico, Distribution: Mexico, Ri ea PERESKIA. 13 This species was described by De Candolle from Mocifio and Sessé’s drawing, but it has never been collected since, so far as we can learn. Its large flowers with laciniate petals must make this a very striking species and it is surprising that it has not been rediscovered. Schumann thought it might be the same as P. nicoyana of Costa Rica, but a study of recent Costa Rican collections indicates that the species are distinct. The measurements given in the description are taken from De Candolle’s plate, and may require some modification. Cactus fimbriatus Mocifio and Sessé (De Candolle, Prodr. 3: 475. 1828) was published only as a synonym of this species. Illustrations: Mém. Mus. Hist. Nat. Paris 17: pl. 18; Férster, Handb. Cact. ed. 2. 1003. f. 136; Safford, Ann. Rep. Smiths. Inst. 1908: 545. f. 11. Text-figure 4 is copied from the first illustration above cited. 4. Pereskia nicoyana Weber, Bull. Mus. Hist. Nat. Paris 8: 468. 1902. Tree, usually about 8 meters high; branches rigid, stout, covered with smooth brown bark; spines wanting or single, long (4 cm. long), stout and porrect; leaves in fascicles on old branches, but alternate on young shoots, lanceolate or oblanceolate, subsessile, the lateral veins almost parallel and some- Fic. 5.—Pereskia nicoyana. Xo.6. Fic. 6.—Pereskia zehntneri. X0.6. times seeming to come from the base, acute, bright green, and somewhat shining ; axils of the young leaves containing long white hairs; petals reddish yellow, fimbriate; ovary pyriform, bearing 8 to 12 spreading leaves, except the uppermost ones, which are much smaller and connivent. Type locality: Gulf of Nicoya, Costa Rica. Distribution: Costa Rica. oo. The spines, hairs in the axils of the leaves, and fimbriate petals indicate a relationship to the little-known P. lychnidiflora. ; Mr. H. Pittier informs us that this species is common in the open coastal forests along the Pacific side of Costa Rica. The plant illustrated by Mr. Pittier, referred to below, has a long, slender trunk and is very spiny. ; According to Mr. W. E. Safford, it has long, slender spines and the habit of the Osage orange, and is used as a hedge plant in Costa Rica, where it is known as matéare or puipute. Illustration: Pittier, Pl. Usuales Costa Rica pl. 2. ; Text-figure 5 was drawn from a plant obtained by Mr. C. Wercklé at San José, Costa Rica, in 1912. 14 THE CACTACEAE. 5. Pereskia (?) zehntneri sp. nov. Shrub, 2 to 3 meters high, with a central erect trunk, very spiny; branches numerous, horizontal, usually in whorls, sometimes as many as Io in a whorl; branches terete, green, fleshy, very easily detached from the stem; leaves stiff, fleshy, numerous, small, 2 to 4 cm. long, ovate to orbicular, acute, standing at right angles to the branches; areoles large, filled with short white wool and numerous slender white spines; flowers at tops of branches, large, 7 to 8 cm. broad, bright red, appear- ing in November; petals broad, retuse; ovary borne in the upper end of the branch, very narrow, 3 to 4 cm. long, bearing the usual leaves, areoles, and spines of the branches. Collected by Dr. Leo Zehntner (Nos. 567 and 630, type) November 15 and 16, 1912, at Bom Jesus da Lapa, Bahia, Brazil, on the Rio Sao Francisco. This is a very rare plant and seen in only one locality, in soil of a peculiar chalky formation. Liv- ing plants were taken by Dr. Zehntner to the Horto Florestal, Joazeiro, Brazil, where they grew well, and whence Dr. Rose obtained specimens in 1915 which were shipped to the United States under No. 19722. The plant is known in Bahia under the name quiabento. It is probably not a true Pereskia; it sug- gests in its habit and foliage some of the Mexican spe- cies of Pereskiopsis, but it may represent a distinct genus. Text-figures 6 and 7 are from the type plant above cited. 6. Pereskia sacharosa Grisebach, Abh. Ges. Wiss. Gottin- gen 24: 141. 1879. Pereskia amapola Weber, Dict. Hort. Bois 938. 1898. Pereskia argentina Weber, Dict. Hort. Bois 938. 1898. Small tree or shrub, 6 to 8 meters high; branches green and smooth, but in age becoming yellowish or light brown; leaves lanceolate to oblanceolate, 8 to 12 cm. long, cuneate at base, more or less pointed at apex; young areole with 1 to 3 spines, the longest 5 cm. long, the others when present not over half as long, all acicular and dark in age; older Fic. 7.—Pereskia zehntneri, Photograph areoles often with 6 or more spines; pedicels sometimes 10 7 ; grap . : . by Paul G. Russell. mm. long; flowers in terminal clusters, either white or rose-colored and very showy, 8 cm. broad, open at midday; sepals about 8, 1 or 2 petal-like, the others scale-like, the outer sepals and upper scales bearing long hairs; petals 8, rose-colored, oblanceolate, 3 cm. long; stamens free from the petals, numerous, unequal, erect; filaments, style, and stigma- lobes white; ovules borne on the lower part of ovary; ovary bearing small leaves, their axils filled with short wool and occasionally bearing a spine; fruit hard, 2.5 to 4 cm. in diameter, more or less tapering at base, many-seeded, leafless or nearly so, sometimes proliferous. Type locality: Cobos, Oran, Argentina. Distribution: Paraguay and Argentina. Schumann (Gesamtb. Kakteen 765. 1898) gives Opuntia sacharosa Grisebach as a synonym of this species, but erroneously, since it was never taken up by Grisebach as an Opuntia. The Index Kewensis refers this species to P. aculeata, doubtless following Hooker s references in Curtis’s Botanical Magazine for 1890 in regard to Argentine plants, which even then were little known. The common name of this plant in Argentina is sacharosa. It is sometimes used as a hedge plant. Plate u, figure 4, represents a leafy branch of lant gi k Botanical Garden by Frank Weinb y a piant given to the New Yor erg in 1903; figure 5 shows its fruit. ae AOR Te ee PERESKIA. 15 7. Pereskia moorei sp. nov. A much branched shrub about 1 meter high, covered with brown bark; branches stout; leaves orbicular or obovate-oblong, rounded or apiculate at the apex, somewhat cuneately narrowed at the base, thick and fleshy, 4 to 8 cm. long, 3.5 to 6 cm. wide; areoles suborbicular, 4.5 mm. in diameter, the wool gray; spines at each areole mostly 2 to 4, very unequal, the longest 7.5 cm. long or less, ashy gray, blackish toward the apex; flowers purplish red, about 4.5 cm. long; ovary few-leafed, its leaves obovate-oblong, 2.5 to 3 cm. long, bearing 1 to 3 black spines about 5 mm. long in the axils; sepals narrowly oblong-obovate, bluntly acute, 2.5 cm. long, bearing long bristles in their axils; petals obovate, obtuse, 3.5 cm. long, rose-colored; stamens about 2 cm. long; areoles on the ovary large, filled with a mass of short, white wool and bearing an occasional short spine; fruit not known. Fic. 8.—Pereskia moorei. Xo0.66. Fic. 9.—Pereskia guamacho. Described from the specimen preserved in the herbarium of the British Museum of Natural History collected at Corumba, Brazil, by Spencer Moore, No. 955, who has kindly furnished us with data for this description, together with a sketch of the type specimen. Specimens were also collected at Corumba by F. C. Hoehne in 1908, No. 4863, who sup- posed it to be P. sacharosa. Figure 8 is from a photograph of an herbarium specimen from Matto Grosso, Brazil, received from F. C. Hoehne in 1915. 8. Pereskia weberiana Schumann, Gesamtb. Kakteen 762. 1898. Shrubby, much branched, glabrous, 2 to 3 meters high, the slender round branches about 3 mm. thick; leaves ovate to elliptic, about 3 cm. long and 2 cm. wide, sessile, acute at the apex, obtuse at the base; areoles circular, slightly elevated, the wool short, whitish, fading brown; spines 3 to 6 at the lower areoles, solitary at the upper, 2 cm. long or less, terete, acicular, yellow or horn-colored ; flowers clustered, white, about 1 cm. long or less; ovary about 2 mm. long, bearing a few white, woolly areoles; outer segments of the perianth triangular, acute, woolly at the axils, the inner spatulate to obovate; stamens a little longer than the petals; stigma-lobes 3 or 4, erect. 16 THE CACTACEAE,. Type locality: Tunari Mountains,* Bolivia, at 1,400 meters altitude. Distribution: Bolivia, known only from the type locality. This species is said to flower in May. The description has been drawn from a cotype in the herbarium of the New York Botanical Garden, and from Professor Schumann’s original account of the species in his Gesamtbeschreibung der Kakteen, p. 762. Dr. Kuntze obtained the specimens during his botanical exploration of Bolivia in 1892. The species was named, but not-#escribed, by Professor Schumann in Dr. Kuntze’s Revisio Genera Plantarum (37: 107. 1893). The material preserved is too imperfect to enable us to give an illustration of this plant. Fic. 10.—Pereskia guamacho. Xo.8. 9. Pereskia guamacho Weber, Dict. Hort. Bois 938. 1898. __ Plant very spiny, usually a small shrub 1 to 3 meters high, but often a tree 10 meters high with a trunk up to 4 dm. in diameter and 3 meters long or more below the much branched top; areoles rather prominent, especially in age often standing out like small knobs on the branches filled with brown felt, at first usually with only 1 to 4 spines along with a few short accessory ones but in age often with 20 spines or more; spines somewhat divaricate, rigid, brown, the longer ones often 4 cm. long; leaves on young branches solitary, but on old wood growing in fascicles, acute, lanceolate to ovate or obovate with cuneate bases, usually about 3 cm. long, but sometimes 5 tog cm. long by 3, to 6 cm. broad, deshy; flowers probably solitary, but so thickly set along the branches as to appear ; spica c: sessile, bright yellow, 4 cm. broad; ovary covered with small, lanceolate-acuminate eaves, these hairy in the axils; stamens numerous; fruit globular, about 2 cm. in diameter, becoming naked, said to be orange-colored and edible; seeds black, flattened, 4 mm. broad Type locality: Basin of the Orinoco, Venezuela. Distribution : Venezuela mainland and on Margarita Island. This plant is very common not only in the flat land along the coast of Venezuela but also m tne mountains. It is also widely grown in and about yards, for the leaves are pposed to have medicinal properties, and when properly grown as a hedge it forms a * . . Tunari Mountains, just northwest of Cochabamba, Bolivia, about at the site of Sacaba Re aA ee es eee i Ea OS REE, ce Ae ae Se PERESKIA. 17 most formidable protection. In the grazing regions of the country and along railways where wire fencing is employed, the trunks and larger branches are used for posts and smaller branches for intervening supports; these posts and stays, however, do not die, but in time grow to considerable size. Although the wood, especially the branches, has little strength or endurance, it is used somewhat for making hanging baskets for orchids. It is known everywhere as guamacho, which was taken by Weber as the specific name for the plant. Figures 9 and 10 are from photographs taken by Mr. H. Pittier at Cardcas, Venezuela, in 1913. 10. Pereskia colombiana sp. nov. A tree, 6 to 11 meters high, or sometimes smaller and shrub-like; main stem covered with clus- ters of slender spines, 2.5 to 7 cm. long; branches glabrous, either bearing spines or naked, covered with light-brown bark; areoles small, woolly; leaves oblong to obliquely orbicular, short-petioled, unarmed at base, often broad above, usually acute, probably fleshy, glabrous, 4 cm. long or less; flowers bright yel- low, opening about midday, borne on the old wood, solitary, sessile, 4 cm. broad; ovary covered with small ovate, acute leaves, these hairy in the axils; sepals oblong, obtuse, about 1 cm. long, entire on the margins; stamens numerous; fruit not known. Collected by Herbert H. Smith at low altitudes near Santa Marta, Colombia, in April, 1898 to 1905 (No. 1886, type), and from the same locality by Justin Goudot in 1844, and by Francis W. Pennell in 1918 (No. 4765). Mr. Smith remarks that the leaves are deciduous in March or April, and that the tree is leafless when in bloom in the spring. Figure 11 is copied from a drawing of an herbarium specimen collected by Herbert H. Smith at Ronda, Santa Marta, Colombia. 11. Pereskia tampicana Weber, Dict. Hort. Bois 939. 1898. Shrub; branches often without spines or the spines several, needle like, black, 2 to 3 cm. long; areoles globular, appearing as knobs along the stem; leaves about 5 cm. long, petioled; flowers 2.5 cm. long; petals entire, rose-colored. Fic. 1 1.—Pereskia colom- Type locality: Near Tampico, Mexico. biana. Xo.5. Distribution: Eastern Mexico, but known only from the type locality. P. tampicana is not well known and has been reported only from Tampico, Mexico. Dr. E. Palmer made a careful search for it some years ago at the type locality, but in vain. In 1912 Dr. Rose examined the two small specimens of the Species preserved in the herbarium of the Royal Botanical Garden of Berlin, and is convinced that it is a Pereskia and not a Pereskiopsis. Pereskia rosea A. Dietrich (Allg. Gartenz. 19: 153. 1851; Opuntia rosea Schumann, Gesamtb. Kakteen 764. 1898) is supposed to have come from Mexico, but we have not been able to identify it; Schumann refers to it in a note under P. tampicana. Here he also takes up Pereskia zinniaeflora De Candolle (Prodr. 3: 475. 1828). Both these specific names are much older than P. tampicana, and should either of them be found identical with it, the name P. tampicana would be rejected. 12. Pereskia bleo (HBK.) De Candolle, Prodr. 3:475. 1828. Cactus bleo Humboldt, Bonpland, and Kunth, Nov. Gen. et Sp. 6:69. 1823. Pereskia panamensis Weber, Dict. Hort. Bois 739. 1898. A tree, sometimes 7 meters high; trunk 10 cm. in diameter or less, when old becoming naked, but young shoots often bear large fascicles of spines (sometimes 25 or more); young branches red, leafy, its spines in fascicles of 5 and 6, but young shoots often bear but 1 to 4, black, acicular, up to 2. 5 cm. 18 THE CACTACEAE. long; leaves thin, oblong to oblanceolate, 16 to 21 cm. long, 4 to 5.5 cm. wide, acuminate, cuneate at base, tapering into petioles 2 to 3.5 cm. long; areoles circular, bearing when young a little wool, but soon becoming naked; calyx turbinate, somewhat angled, naked, with linear deciduous sepals; petals 12 to 15, rose-colored, obovate, 3.5 cm. long; style longer than the stamens, red, thick; stigma- lobes 5 to 7; ovary depressed; fruit yellow, truncate, 5 to 6 cm. long; seeds 6 mm. long, black, shining. Type locality: Near Badillas, on the Magdalena River, Colombia, South America. Distribution: Northwestern South America and throughout Panama. This species was collected by Bonpland during Humboldt’s trip through the New World and was described and published by Kunth in 1823. Dr. Rose examined two of the original specimens in the herbarium of the Museum of Natural History at Paris, one being the specimen given by Bonpland and the other the specimen in the Kunth Herbarium, Fic. 12.—Pereskia bleo. which is kept distinct from the general herbarium. The only other representatives of this species from South America which we have seen are a specimen in the herbarium of the same museum, which was collected by Justin Goudot in Colombia in 1844, and one collected in 1852, by I. F. Holton at San Juancito, Colombia, preserved in the Torrey Herbarium and one recently brought by Francis W. Pennell from Boca Verde, Rio Sinu, Colombia Heretofore Pereskia bleo has been considered one of the most common ‘species for many living collections as well as herbaria contain manly specimens under that name: the plant which has been known as P. bleo, however, is P. grandifolia Haworth, now known to be a native of Brazil and not found wild in Colombia. | he pince aerermining at the so-called Pereskia bleo of our gardens and of Brazil is not same a SJ ? ‘bl O° um 0 it, we have become convinced that P. panamensis Weber is the s /*. bleo; Mr. Pittier’s exhaustive exploration of Panama has strengthened our con- clusions, for he has traced this speci ’ : pecies as far th a: . . , plant came from northern Colombia. south as the Colombian border. Humboldt’s PERESKIA. 19 In Panama the plant is known under the name fiajii de Culebra. Illustrations: All illustrations referred to this species which we have exainined are cited under P. grandifolia. Figure 12 is from a photograph taken by Henry Pittier, near Chepo, Panama, October 30, IQII. 13. Pereskia bahiensis Giirke, Monatsschr. Kakteenk. 18:86. 1908. Shrub or tree, sometimes 8 meters high, with a more or less definite trunk, sometimes 1 meter or more long and 1.5 to 2 dm. in diameter, and a large, rounded, much branched top; spines on new growth wanting, but on old wood 5 to 40 at an areole, some of them 5 to 9 cm. long; young branches green; leaves lanceolate, 6 to 9 cm. long, deciduous, somewhat pointed, narrowed at base into short petioles; flowers in small panicles, rose-colored; ovary bearing large leaves with cuneate bases; fruit often proliferous, yellowish when mature, more or less irregularly angled, bearing large leaves 3 to 4 cm. long, which ulti- mately fall away; seeds black, oblong, 5 mm. long. Type locality: In the southeast catinga between Rio Paraguacu at Tambury and Rio das Contas at Caldeirao, Bahia, Brazil. Distribution: Dry parts of eastern Brazil. « This species is very common in the dry regions of Bahia; and is often planted for hedges about small towns. The fruit is proliferous; as many as eight were found hanging from a single peduncle; it is said to be edible, but while half-ripe is very astrin- gent. The perfect fruits can seldom be _ found, because the birds peck into them for the large black seeds. Called in Brazil, according to Dr. Leo Zehntner, Iniabanto, Espinha de Sado Antonio, and Flor de Céra. He Fics. 13, 14.—Pereskia bahiensis. Xo.5. also. says: “I think ; . . . Iniabanto is the best and ought to be generalized. It is derived from Iniabo = Okra = Hibiscus esculentus, without doubt because the leaves of the pereskias are sometimes eaten by people, giving a mucilaginous dish like that of the Hibiscus fruit.” Illustration: Monatsschr. Kakteenk. 18: 87. Figure 13 is from a specimen, preserved in formalin, collected by J. N. Rose near Machado Portello, Bahia, Brazil, in June 1915; figure 14 is from a plant from the same place ; figure 15 is from a photograph obtained by J. N. Rose at Barrinha, Bahia, in June 1915. 14. Pereskia grandifolia Haworth, Suppl. Pl. Succ. 85. 1819. Cactus rosa Vellozo, Fl. Flum. 206. 1825. ; ; Pereskia ochnacarpa Miquel, Bull. Sci. Phys. Nat. Neerl. 48. 1838. “Tree or shrub, 2 to 5 meters high, usually with a definite, very spiny, woody trunk up to 1 dm. in diameter, the branches fleshy, glabrous, elongated, usually with 1 or 2 acicular spines at the areoles; leaves oblong, obtuse or acute, somewhat narrowed at base, 8 to 15 cm. long; petioles short; inflorescence terminal, usually few-flowered; 3.5 to 4 cm. broad ; sepals green; petals rose-colored, sometimes white; filaments red; style and stigma-lobes white; ovary leaf-bearing; fruit described as large, pear-shaped, many-seeded; seeds black. 20 THE CACTACEAE. Ty lity: In Brazil. Dnibution. Brazil, widely planted and subspontaneous throughout the West Indies. The plant is extensively used for hedges in tropical America. , It is planted by pushing ings into the ground, its spiny stems soon forming a capital barrier. | “ Illustrations: Vellozo, FI Flum. 5: pl. 27, as Cactus rosa. Amer. Garden II: 462; Blithende Kakteen 3: 137; Curtis’s Bot. Mag. 63: pl. 3478; Cycl. Amer. Hort. Bailey ‘i f. 309; Dict. Hort. Bois f. 678; Edwards’s Bot. Mag. 17: pl. 1473; Engler and Pran’t Pflanzenfam. 3°: f. 71; Gard. Chron. III. 20: f. 75; Karsten, Deutsch. F1. 887. . 95 Martius, Fl. Bras. 47: pl. 63; Pfeiffer and Otto, Abbild. Beschr. Cact. 1: pl. 30; Reichen- bach, Fl. Exot. pl. 328, all as Pereskza bleo. Fic. 15.—Pereskia bahiensis. Photograph by Paul G. Russell. Plate 1, figure 1, represents a flowering branch of a plant obtained by N. L. Britton on St. Christopher in rgor. Figure 16 is from a photograph of the plant used as a hedge near Rio de Janeiro, Brazil. 15. Pereskia zinniaeflora De Candolle, Prodr. 3: 475. 1828. Shrub; leaves oval to oblong, 2 to 4 cm. long, branches 1 or 2 at an areole, on old branches 4 Or 5, 5 cm. wide, rose-red; petals entire, bearing small, stalked leaves. Type locality: In Mexico. Distribution: Mexico. Nicholson associates this species with Pereskia bleo, that is, P. relationship is not close. acuminate, cuneate at base; spines on young all short, less than 1 cm. long; flowers broad, obtuse or retuse; style and stamens very short; ovary truncate, grandtfolia, but the The measurements of the flower given above are taken from sini ie iiia haat ES M. E. Eaton del ¥ i. 1. Flowering branch of Pereskia grandifolia. 2. Leafy branch of Per: skiopsis chapistle. 3. Leafy branch of Pereskiopsts pititache. (All natural size.) PERESKIA. 21 De Candolle’s plate cited below, and may not be quite correct. This species, so far as we are aware, has not been again collected. Cactus zinniaeflora Mocifio and Sessé (De Candolle, Prodr. 3: 475. 1828) was given as a synonym. Illustrations: Forster, Handb. Cact. ed. 2. f. 135; Mém. Mus. Hist. Nat. Paris 17: pl. 17; Riimpler, Sukkulenten f. 127; Suppl. Dict. Gard. Nicholson f. 624. Figure 17 is a copy of the second illustration above cited. Fic. 16.—Pereskia grandifolia. Exposed branches are Fic. 17.—Pereskia zinniaeflora. shown above the other foliage. 7 16. Pereskia horrida (HBK.) De Candolle, Prodr. 3:475. 1828. Cactus horridus Humboldt, Bonpland, and Kunth, Nov. Gen. et Sp. 6:70. 1823. Tree, 4 to 6 meters high, with terete slender branches; spines often solitary, sometimes 2 or 3, Slender, dark in color, unequal, the longest 2 to 3 cm. long; leaves solitary, alternate, narrowly oblong, 3 cm. long, subsessile, entire, glabrous; flowers 3 to 5 together in upper axils, about 10 mm. long; calyx described as 5-toothed and persistent; petals 5 or 6, red, lanceolate, spreading; fruit fleshy, many-seeded. l'ype locality: “Ad flumen Marafion prov. Jaen de Bracamoros.”’ (Schumann says this locality is in Peru.) Distribution: Northwestern South America. _ The above description is compiled from Kunth’s original description and from notes made by Dr. Rose upon the type material in the herbarium of the Museum of Natural History at Paris, in which there are specimens from both Bonpland and Kunth. Both of these sheets lack flowers and fruit, and only Kunth’s bears leaves. So far as we are aware, 22 THE CACTACEAE. no other material of this species has been collected since Humboldt’s time except that in 1912 Dr. Weberbauer wrote that he had visited the Marajfion, at Humboldt’s locality, and had collected a single specimen, which had been sent to the Botanical Museum at Berlin. 17. Pereskia cubensis Britton and Rose, Torreya 12:13. 1912. A tree, 4 meters high, with a trunk 2. 5 dm. in diameter and a large, flat, much branched top; bark brownish, rather smooth, marked here and there by black bands (representing the old areoles) these broader than high; young branches slender, smooth, with light-brown bark: spines from young areoles 2 or 3, needle-like, brownish, 2 to 4 cm. long, from old areoles very numerous (25 or more), and much longer (5 cm. or more long); leaves several at each areole, sessile, bright green on both sides, oblanceolate to oblong or obovate, 1 to 4 cm. long, 10 to 12 mm. wide, acute at both ends or obtuse at the apex, fleshy, the midvein broad, the lateral veins very obscure; peduncle very short, jointed near the base, bearing 1 to 3 leaf-like bracts; flowers terminal and also axillary, solitary; sepals 5, obtuse or rounded, ovate-oblong to orbicular, unequal, 7 to 9 mm. long, the larger ones with broad purple margins; petals 8, about 1 5 mm. long, deep reddish purple, obovate-elliptic, rounded; stamens many, about 6 mm. long; anthers light yellow; ovary turbinate, naked, spineless; fruit not seen. TAR My BOS SY aE rant ae <\ y o oi 4 pee * X = 4 X0.5. dnamo and Caimanera, Oriente, collected; it also inhabits coastal thickets at Ensenada de y bearing leaves with less acute A single plant was also observed on La Vigia Hill, ) and smaller leaves than either of PERESKIA. 23 18. Pereskia portulacifolia (Linnaeus) Haworth in De Candolle, Prodr. 3: 475. 1828. Cactus portulacifolius Linnaeus, Sp. Pl. 469. 1753. A tree, 5 to 6.6 meters high, the branches terete, very spiny; spines acicular, sometimes almost bristle-like, 2 cm. long, on old wood in clusters of 7 to 9, but on new growth usually solitary; leaves Yo ys de Fic. 20.—Pereskia portulacifolia. 0.66. only 1 cm. long or less, cuneate at base, often retuse at apex; peduncles short but definite, 2 to 5 mm. long, bearing several small spatulate to broadly obovate leaves; flowers rose-colored, about 3 cm. broad; sepals about 3, ovate to shortly oblong, obtuse, fleshy, 8 mm. or less long; petals oblong, about 2 cm. long, thin, obtuse; ovary small, truncate, naked or bearing a single small leaf; immature fruit hard, depressed, 2 cm. long, 2.5 cm. broad, smooth, naked or with a single small leaf 5 to 6 mm. long, with a broad scar at the top 8 to ro mm. in diameter; fruit globular, naked; seeds large, black. Type locality: Tropical America, doubtless Hispaniola. Distribution: Haiti. The usual reference for the first publication of the plant under Pereskia is Haworth’s Synopsis (Syn. Pl. Succ. 199. 1812), but it was not here formally transferred from the genus Cactus. His statement is: ‘‘Cactus portulacifolius is another species of this genus.” Our knowledge of this plant is drawn from the illustration below cited and descriptions, and from a fragmentary specimen collected by W. Buch near Gonaives, Haiti, in 1900, 24 THE CACTACEAE. where it grows on dry calcareous rocks, and one obtained by Paul Bartsch at Tomaseau in April 1917. Dr. Bartsch states that the flower reminds one very much of a rose and the fruit is pendent like a green plum. Lunan in 1814 (Hort. Jam. 2: 236) described a tree nearly a foot in diameter, growing at a residence near Spanish Town, Jamaica, stating that it differed from Pereskia by the absence of tufts of leaves on its fruit. His description points to Pereskia portulacifolia, but nothing is known of the species in Jamaica at the present day; according to Grisebach, Macfadyen recorded it as cultivated there. Illustration: Plumier, Pl. Amer. ed. Burmann pl. 197, f. 1. Figure 20 is copied from the illustration above cited. 19. Pereskia conzattii sp. nov. Tree, 8 to 10 meters high; bark of stems and branches brown and smooth; leaves orbicular to obovate, acute, 1 to 2.5 em. long; areoles small, with short white wool and a few long hairs; spines 2 to 6 on young branches, 10 to 20 on main stem, acicular, 2 to 2.5 cm. long, at first yellowish brown, dark brown in age; flowers not known; ovary bearing small scales; fruit naked, pear-shaped, more or less stalked at base, 3 to 4 cm. long; seeds black, glossy, 3 mm. long, with a small white hilum. Collected at Salina Cruz and Tehuantepec, Oaxaca, Mexico, in February and April, 1913, by Professor C. Conzatti; probably also in Guatemala. SPECIES UNKNOWN TO US. Pereskia affinis and P. haageana Meinshausen, Wochenschr. Girtn. Pflanz. 2:118. 1859. Pereskia cruenta, P. grandiflora, and P.(?) plantaginea, the first two given as synonyms and the last merely mentioned by Pfeiffer (Enum. Cact. pp. 176, 177, and 179) can not be identified. The same is true of P. grandispina Forbes (Journ. Hort. Tour Germ. 159. 1837). Tribe 2. OPUNTIEAE. __ Plants usually very fleshy, never epiphytic, branched (usually much branched), one to many- jointed; joints diverse in structure, terete, compressed, or much flattened, with irregularly scattered areoles, ribless, except one species; leaves usually caducous, but in some species more or less persist- ent, small or minute, subulate or cylindric, in one genus broad and flat; areoles usually glochidif- erous (except in Maihuenia; in Grusonia only those of the ovary), mostly spine-bearing; spines usually slender, straight or nearly so, sometimes sheathed; corolla mostly rotate (sepals and petals in Nopalea erect) ; flowers sessile, diurnal, one from an areole; fruit usually a fleshy berry, sometimes dry, rarely capsular; seed white or black, globular, flattened or even winged, with a thin or hard testa; cotyledons large, elongated. This tribe contains 7 genera and at least 300 species, various in habit, flower, fruit, and seeds. It is more closely related to the Pereskieae than to the Cereeae. ‘The following characters possessed by some or all genera of the Opuntieae are wanting in the Cereeae: Leaves on the stem (see also Harrisia and Hylocereus); glochids in the areoles; sensi- tive stamens; sheathed spines; winged, white, and bony-covered seeds; the separation of withering calyx, stamens, and style from the ovary; areoles irregularly distributed over the stem in all the genera except Grusonia, in which they are arranged on ribs as in many of the Cereeae. y The tribe is distributed through i i ghout the cactus regions of the A: except Opuntia, are localized. 5 oni peat easy K Leaves broad and flat EY TO GENERA. Leaves subulate or eylindrig, eee 1. Pereskiopsis Seeds broadly winged ................. Seeds wingless. eee 2. Pterocactus Stamens much longer than the petals. Petals erect; joints flat................ 4 Petals recurved: joints terete eee 3. Nopalea Stamens shorter than the petale, ene 4. Tacinga Joints flat to terete, not ribbed. Testa of the seed thin, black, shining....... L ] Testa thick, pale, dale ME ee eee eee eee nee eee 5. Mathuenia Joints terete, longitudinally fisbed : Ports e eee eee eee 6. Coun cen Perec cece cece eee e eens eee nenes 7. Grusonia PERESKIOPSIS. 25 fo \ 2/ 1. PERESKIOPSIS Britton and Rose, Smiths. Misc. Coll. 50: 331. 1907. Trees and shrubs, in habit and foliage similar to Pereskia; old trunk forming a solid woody cylinder covered with bark and resembling the ordinary dicotyledonous stem: areoles circular, spine-bearing or sometimes spineless, also bearing hairs, wool, and usually glochids; flowers similar to those of Opuntia; ovary sessile (one species described as pedunculate), with leaves at the areoles (except in one species) ; fruit red, juicy; seeds bony, few, covered with matted hairs. Type species: Opuntia brandegeei Schumann. The plants are common in hedges and thickets of Mexico and Guatemala. As to the number of species to be recognized in this genus we are uncertain; about 16 have been described. In our first discussion of the genus (op. cit.) we recognized 11 species, including several known only from descriptions. There now seem to be at least 10 species, of which 8 are in cultivation in Washington and New York. ‘Two of the plants were described, as early as 1828, as species of Pereskia, and here they remained with 2 later-described species until, in 1898, Dr. A. Weber transferred them to Opuntia, placing them in a new subgenus, Pereskiopuntia. "The same year Dr. Karl Schumann adopted Weber’s conclusions, publishing his treatment of the subgenus and assigning 5 species to it. In its large leaves and woody, spiny stems, this group suggests Pereskia, but it has glochids and different flowers, fruit, and seeds; in flowers, fruit, seeds, and glochids it re- sembles Opuntia, but on account of habit and foliage must be excluded from that genus. In view of these differences, Britton and Rose in 1907 established the genus Peres- kiopsis and listed 11 species, 4 of which had been originally described as species of Pereskia and 5 as species of Opuntia. Since then we have grown most of these plants along with the pereskias and opuntias so as to compare them. Unfortunately we are not able to describe all the species fully, for they have never been known to flower in cultivation, although some of the species, at least, bloom freely in the wild state. The leaves on the lower parts of shoots are sometimes broader and shorter than those on the upper parts, and in greenhouse cultivation the leaves of some species are narrower than when the plants are growing under natural conditions. The generic name is from the Greek and signifies resembling Pereskia. KEY TO SPECIES. Stems, ovary, and often the leaves more or less pubescent. Normal leaves long-acuminate, narrow, with narrow cuneate bases...................... 1. P. velutina Normal leaves abruptly pointed, somewhat cuneate at base............................ 2. P. diguetii Stems, ovary, and leaves glabrous. Leaves, at least some of them, not much longer than broad. Fruit without leaves, at least so figured... 2.00.0... cee eee eee 3. P. opuntiaeflora Fruit with leaves subtending the areoles. Areoles white, with few glochids or none. ; — Leaves orbicular or nearly so, rounded or apiculate ce cae ere ec ebaccccscecesance 4. P. rotundifolia Leaves, at least the upper ones, obovate or elliptic, acute at both ends......... 5. P. chapistle Areoles dark, filled with numerous brown glochids, cece eee cece eee eee eee eae 6. P. porteri Leaves, at least some of them, twice as long as broad or longer. , Leaves spatulate................000022005- Le eee ee cece eee eee ee eee 7. P. spathulata Leaves elliptic to oblong, or obovate. 8. P. pititache Leaves pale green, glaucous...........00.00 000 eee eee Leaves bright gr Fic. 21.—Pereskiopsis velutina. original description and illustration; otherwise nothing is known of the plant. This species, as illustrated by De Candolle, is unlike anything we know. culate fruit it is like Pereskia, but its leafless ovar exclude it from that genus. and we suspect that the deli specimen drawn. In its pedun- y and its areoles filled with glochids would In a general way the illustration looks more like a Pereskiopsis, neation 1s incorrect or that the leaves had fallen away from the PERESKIOPSIS. 27 Cactus opuntiaeflorus Mocifio and Sessé (Pfeiffer, Enum. Cact. 178. 1837) was published as a synonym of Pereskia opuntiaeflora. Illustrations: Forster, Handb. Cact. ed. 2. f. 137; Mém. Mus. Hist. Nat. Paris 17: pl. 19, both as Pereskia opuntiaeflora. Figure 23 is copied from the second illustration above cited. 4. Pereskiopsis rotundifolia (De Candolle) Britton and Rose, Smiths. Misc. Coll. 50: 333. 1907. Pereskia rotundifolia De Candolle, Prodr. 3: 475. 1828. Opuntia rotundifolia Schumann, Gesamtb. Kakteen 652. 1898. Stem thick, more or less woody; branches slender, glabrous; leaves nearly orbicular, mucronate; spines elongated, solitary; flowers 3 cm. broad, borne on the second-year branches; petals reddish yellow. broad, with mucronate tips; ovary leafy; fruit obovoid, red, leafy. Fic. 24.—Pereskiopsis rotundifolia. X Tereskia spathulata Otto in Pfeiffer, Enum. Cact. 176. 1837. : Vic. 26.—Pereskiopsis Opuntia spathulata Webe s. Hist. Nz aris 41 165 sorter . L p ata Weber, Bull. Mus. Hist. Nat. Paris 4: 165. 1898, porteri. 0.66. oy ranching shrub, I to 2 meters high, branches few, glaucescent, deflexed: leaves spatulate, ue green, 2. ° to 5 cm. long; areoles distant, woolly, hairy when young; spines 1 or 2, rigid, white sclow, 2.5 cm. long; glochids brown, borne in the upper part of the areoles; flowers red; seeds white. PERESKIOPSIS. 29 Type locality: In Mexico. Distribution: Probably southern Mexico, but no definite locality is known. There is some confusion in the literature of this species; Schumann describes it as pubescent, while in the original description nothing is said about pubescence; this error is probably due to a misidentification, for Dr. Rose found in the Museum of Paris two specimens collected by Diguet at Guadalajara, Mexico, which were labeled Opuntia spathulata, and which have pubescent branches and leaves; these are undoubtedly O. diguetii. Pereskia crassicaulis Zuccarini (Pfeiffer, Enum. Cact. 176. 1837) was never published, simply being given as a synonym of P. spathulata. 8. Pereskiopsis pititache (Karwinsky) Britton and Rose, Smiths. Misc. Coll. 50: 332. 1907. Pereskia pititache Karwinsky in Pfeiffer, Enum. Cact. 176. 1837. Pereskia calandriniaefolia Link and Otto in Salm-Dyek, Cact. Hort. Dyck. 1849. 252. 1850. (Accord- ing to Schumann.) Opuntia pititache Weber, Bull. Mus. Hist. Nat. Paris 4: 166. 1808. Stems rather low and somewhat branching; bark light brownish and flaking off; areoles on main trunk each bearing 1 to 4 slender acicular spines and a small cluster of yellowish glochids; branches, even when several years old, bearing a single long, acicular spine from an areole and no glochids; young and growing branches rather slender and green, their areoles small, black in the center, with long, white hairs from their margins and no spines; leaves obovate or oblong- obovate, 4 cm. long or less, pale green, thin, acute or bluntish at the apex, narrowed at the base. Type locality: In Mexico. Distribution: Uncertain, but reported from southern Mexico. In the original description this species is said to have a very spiny, erect woody trunk, the branches spreading nearly horizontally, the spines unequal, 3 to 6, 25 to 37 mm. long, the leaves fleshy, green, lanceolate to ovate, 37 mm. long, 16 mm. broad. It was named by Baron Wilhelm von Karwinsky and probably collected by him in Mexico, but no definite locality was given; Weber states it is from Tehuantepec, while Schumann gives Tehuacan on a statement of Weber. Pereskia calandriniaefolia we have referred here, follow- ing Schumann, but the original description is somewhat dif- ferent from that of P. pititache, the leaves being described as spatulate to lanceolate, strongly narrowed below, 7.5 em. long. Our description is mostly drawn from specimens grow- ing in the New York Botanical Garden obtained from M. Simon, of St. Ouen, Paris, in 1go1. Illustrations: Abh. Bayer. Akad. Wiss. Miinchen 2: pl. 1, sec. 6, f. 1, 2; pl. 2, f. 9, both as Pereskia pititache. Plate 111, figure 3, represents a leafy shoot of a plant sent by M. Simon, of St. Ouen, Paris, France, to the New York Botanical Garden in rgotr. 9. Pereskiopsis aquosa (Weber) Britton and Rose, Smiths. Misc. Coll. 50: 331. 1907. Opuntia aquosa Weber, Bull. Mus. Hist. Nat. Paris 4: 165. 1898 Shrub, with glabrous, glaucous, green branches, the young shoots with long white hairs at the areoles; leaves bright green, nearly elliptic, acute, about twice as long as wide, narrowed at the base, glabrous; spines usually solitary, standing at right angles to the stem, white; glochids few, yellow; flowers yellow; outer petals blotched with red; fruit pear-shaped, 4 to 5 cm. ong, 2 to 2.5 Fic. 27.—Pereskiopsis aquosa. cm. in diameter, yellowish green. X0.66. 30 THE CACTACEAE. Type locality: Guadalajara, Mexico. Distribution: In hedges about Guadalajara, Mexico. The fruit, called in Mexico tuna de agua and tasajillo, is used in making a cooling drink and for preserves. Opuntia spathulata aguosa (Bull. Mus. Hist. Nat. Paris 4: 165. 1898) was given as a synonym of this species, but was never published. Illustration: Safford, Ann. Rep. Smiths. Inst. 1908: pl. ro, f. 2. Figure 27 represents a leafy shoot of the plant collected by W. E. Safford near Guadalajara, Mexico, in 1907. 10. Pereskiopsis kellermanii Rose, Smiths. Misc. Coll. 50: 332. 1907. Stem glabrous, herbaceous, weak, and clambering over shrubs to a length of 4 to 5 meters, about 2 cm. in diameter; second-year branches usually at right angles to main stem, with cherry- red bark; old stem bearing several slender, acicular brown spines, sometimes only 1, sometimes wanting, and numerous brown glochids; young branches green, fleshy, their areoles circular, white, filled with long white hairs, brown glochids, and often with several acicular brown spines; spines on wild plants often stout, usually solitary, nearly black, 2 to 3 cm. long; leaves various, shining green, glabrous, thickish, elliptic and two or three times as long as wide, or suborbicular, acute at the apex, narrowed at the base, 5 cm. long or less, 2 to 2.5 cm. broad; flowers not known; fruit red, glabrous, leafy, 3 to 6 cm. long, bearing large areoles filled with brown glochids; seeds covered with matted hairs. Fics 28, 29, and 30.—Pereskiopsis keller- manii, showing three leaf forms. Xo0.5. Type locality: Trapichite, Guatemala. Distribution: Guatemala. Figures 28, 29, and 30 are copied from sketches of the leaf-forms of the type plant, made by W. A. Kellerman in Guatemala in 1908. ( 3) 2. PTEROCACTUS Schumann, Monatsschr. Kakteenk. 7:6. 1897. Stems low, more or less branched above, cylindric, from tuber-like and often greatly enlarged roots; leaves minute, caducous; spines weak, several or many at each areole; glochids small, cadu- cous as in Opuntia; flower terminal, regular, without tube; perianth-segments several, erect; fila- ments and pistil shorter than the petals; ovary nearly turgid, bearing numerous small clusters of spines; fruit dry, capsular, dehiscent; seeds winged, white; embryo curved. Type species: Pterocactus kuntzet Schumann. Four species have already been described, but three of these we have combined and the fourth is referred to Opuntia. Three additional species, however, are here described. The generic name refers to the winged seeds. This is a remarkable genus, and it is surprising that it remained unrecognized so long, for one of its species was known as long ago as 1837; the fruit and seeds, however, seem not to have been known until about 1897. In habit the plants are nearest some of the anom- alous species of Opuntia, having large roots and short, weak stems like Opuntia chaffeyi, of Mexico; the seeds, however, differ, not only from those of Opuntia, but from those of all other cactus genera, in being winged. The fruit, according to Schumann although we have not been able to confirm his observation definitely, is a capsule with an opercu- lum. Another peculiarity is that the fruit is borne in the end of the stem or branch. While this genus has good characters, it is no more distinct than many others and does not deserve the relative importance given to it by T. von Post and Otto Kuntze in Lexicon PTEROCACTUS. jl KEY TO SPECIEs. Seeds narrowly winged; spines up to 2 cm. long....................... Seeds broadly winged; spines 3 to 10 mm. long. Joints strongly tuberculate..........000000000000.0000....0020-00000..01 ee Joints scarcely tuberculate. Ovary densely covered with weak spines; wing of seed 1 mm. wide...___. See .. 3. P. pumilus Ovary loosely covered with stiff spines; wing of seed 2mm. wide......................... 4. P. tuberosus 1. P. hickenti 2. P. fischeri WY, i) i eee Oo iN ou i OW) at oe: b SW . in) te ‘ “Site 5 Ta ey YZ Wig EZ S iG \ Whe ¢ Wi 4 Fics. 31, 32.—Pterocactus Fic. 33.—Pterocactus fischeri. 1.12. Photograph hickenii. Xo.7. by Paul G. Russell. 1. Pterocactus hickenii sp. nov. a Rootstocks moniliform, consisting of at least 4 joints widely separated; joints above ground 2 or 3, 2 to 3 cm. long, almost hidden by the spines; spines from each areole numerous, slender, yellow above, brown at base; glochids numerous; fruit and flower not known; seeds thick, 5 mm. in diameter, with narrow lateral wing. Collected by Cristé6bal M. Hicken (No. 3284) January 10, 1914, near Como- doro Rivadavia, southeastern Chubut, a 34 Argentina. Figures 31 and 32 represent a plant and a seed from the specimen above cited 2. Pterocactus fischeri sp. nov. er i i ylindric, 1.5 cm. in diameter, tuberculate; Stems low, 1 dm. high or less, spreading or erect, cy Cy Fs ; een leaves minute, actite: tubercles about as long as broad, arranged in spiral ridges somewhat resembling those of Opuntia whipplei; spines numerous, the radials 12 or more, white, annie 6 mr ong, spreading; centrals usually 4, 1 to 1.5 cm. long, brownish, the tips and bases often yellowish; 30 36 Fics. 34. 35. 36.—Seeds of three species of Pterocactus. Natural size. 32 THE CACTACEAE. glochids numerous, yellowish, 3 to 4 mm. long; flowers, in only specimen seen, terminal, almost con- tinuous with the stem; ovary tuberculate and spiny like the stem, deeply umbilicate; seed one, large, flat-winged. Collected by Walter Fischer in 1914 in the Province of Rio Negro, Argentina, and given to Dr. Rose during his visit to Argentina in 1915 by Professor Crist6bal M. Hicken. While this species resembles some of the species of Cylindropuntia of the United States, the spines are not sheathed. Figure 33 is from a photograph of the specimen above cited; figure 34 shows a seed of the same specimen. 3. Pterocactus pumilus sp. nov. Plants low, usually prostrate or ascending; joints cylindric, 1 em. in diameter, covered with weak appressed spines; areoles very woolly; flower terminal; ovary sunk in the apex of the terminal joint, somewhat umbilicate; ovules several; seed flattened, 7 mm. in diameter, very thin. Collected by Crist6bal M. Hicken (No. 3286), January 8, 1914, at Puerto Piramides, Chubut, Argentina. Figure 35 shows a seed of above speci- men. 4. Pterocactus tuberosus (Pfeiffer). Opuntia tuberosa Pfeiffer, Enum. Cact. 146. 1837. _> Pterocactus kuntzei Schumann, Monatsschr. Kak- teenk. 7:6. 1897. Pterocactus kurtzet Schumann in Engler and Prantl, Pflanzenfam. Nachtr. 259. 1897. Pterocactus decipiens Giirke, Monatsschr. Kakteenk. 17: 147. 1907. Roots tuber-like, single or in clusters, usually small but sometimes large and thick, up to 12 cm. long by 8 cm. in diameter, deep-seated, giving off several erect stems, these branching at surface of the ground; terminal branches purplish, turgid, 3 to 40 cm. long, 1 cm. in diameter, more or less clavate; areoles numerous, small, bearing numer- ous small white appressed spines; flowers terminal, 2 to 3 cm. long; petals long, lanceolate, apiculate, yellow; ovary with numerous areoles bearing long bristles; ovules numerous; fruit dry; seeds large, flat, winged, 10 to 12 mm. in diameter. Type locality: Near Mendoza, Argentina. Distribution: Western provinces of Argen- Fic. 37.—Pterocactus tuberosus. Natural size. Photograph tina, chiefly in the mountains. by Paul G. Russell. We have not seen the type of P. kuntzet, which is doubtless at Berlin, but we have examined cotypes in the Kurtz Herbarium at Cérdoba, Argentina, and at New York. Opuntia tuberosa, described from Mendoza as long ago as 1837, has long been a puzzle to botanists, who have tried to associate it with various opuntias. Dr. Rose, who visited Mendoza in 1915, found a tuberous-rooted cactus in the mountains above that city, which we are convinced is the plant described by Pfeiffer. There is no doubt, on the other NOPALEA. 33 hand, that it is Pterocactus kuntzei, from the same region, which was described as new by Schumann in 1897. Opuntia alpina Gillies (Pfeiffer, Enum. Cact. 146. 1837) was not published, but was given as a synonym of Opuntia tuberosa. Schumann referred both names to Opuntia platyacantha. Illustrations: Monatsschr. Kakteenk. 7: 7; Schumann, Gesamtb. Kakteen f. 107, both as Pterocactus kuntzet; Blithende Kakteen 3: pl. 140, as P. decipiens. Figure 36 shows a seed of a plant, collected by Dr. Rose near Mendoza, Argentina, in 1915; figure 37 is from a photograph of same plant; figure 38 is from a photograph taken by Dr. Carlos Spegazzini. . Fic. 38.—Pterocactus tuberosus. (yf 7 \ 3. NOPALEA Salm-Dyck, Cact. Hort. Dyck. 1849. 63. 1850. Much branched cacti with definite cylindric trunks; roots so far as known fibrous; branches or joints flattened, fleshy, often narrow; glochids usually less abundant than in O punti, spines so lita y or in clusters at the areoles, sheathless; leaves small, subterete, soon deciduous; areo “ a n 8 white wool, glochids, and often spines; flowers originating in the areoles usually at or near | na ges of the joints; sepals ovate, erect; petals red or pinkish, erect, closely appressed against t ie ume ous stamens and the style; filaments and style slender, much longer than the pe als; vary ne othe tuberculate, naked or spiny, with a very deep umbilicus; fruit a juicy berry, red, , us } spineless; seeds numerous, flat, covered by a hard bony aril. Nopalea is closely related to Opuntia, with which it 1s petals and elongated filaments and style are constant in N opalea, however described. of Three species were included by Salm-Dyck in this genus when i wed whe type which Opuntia cochenillifera Linnaeus was the first and is therefore co then two species, Karl Schumann described five species in his monograph, but since en secre N. guatemalensis and N. lutea, have been described by Dr. Rose, an 2 wor i by Dr. Griffiths. N. moniliformis (Linnaeus) Schumann, based on plate 19: is Opuntia moniliformis (Linnaeus) Steudel. di “ube The species are natives of Mexico and Guatemala, and have Some of them are widely although none has recently been observed wild on that island. Som it is sometimes united; the erect 34 THE. CACTACEAE. cultivated and may be found throughout the warmer parts of the world. Two are of some economic importance and two or three are grown as ornamentals. The name Nopalea is doubtless from nopal, the common name of Mexicans for certain opuntias and nopaleas. KEY TO SPECIES. Spineless, or rarely a few short spines on old joints...........0.0..000 00 ccc cece e cece ee eee, 1. N. cochenillifera Joints spiny (spines few in N. auberi). Spines, at least those of young joints, very slender, acicular, several at each areole. Spines white... 0.0.6... ccc cece cette tebe eee ee ee ee. 2. N. guatemalensis Spines yellow or becoming brown. Joints obovate to oblong, 10 to 22 cm. long, 5 to 10cm. wide ..................... 3. N. lutea Joints linear-oblong to oblong-lanceolate, 6 to 12 cm. long, 2 to 3 cm. wide.......... 3a. N. gaumert Spines stouter, subulate. Areoles with 1 or 2 spines, or spineless; joints glaucous............................. 4. N. auberi Areoles with 2 to 4 spines; joints green. - Joints linear or linear-oblong, 4 to 7 times as long as wide....................... 5. WN. dejecta Joints oblong or oblong-obovate, 2 to 4 times as long as wide. Spines 2 to 4; joints not tuberculate.........0.0.0.000 00000000 eee 6. N. karwinskiana Spines 4 to 12; joints strongly tuberculate................................, 7. WN. inaperta 1. Nopalea cochenillifera (Linnaeus) Salm-Dyck, Cact. Hort. Dyck. 1849. 64. 1850. Cactus cochenillifer Linnaeus, Sp. Pl. 468. 1753. Opun'ia cochinelifera Milter, Gard. Dict. ed. 8. No. 6. 1768. Often tall plants, 3 to 4 meters high, with trunks up to 2 dm. thick; branches of ascending or spreading oblong joints, sometimes 5 dm. long, green, bright green at first; spines none or rarely minute ones develop on the older joints; glochids numerous, caducous; leaves small, awl-shaped, soon deciduous; flowers appearing from the tops of the joints, usually in great abundance; flower, from base of ovary to tip of style, 5.5 cm. long; ovary nearly globular, 2 cm. long, with low diamond- shaped tubercles, its areoles bearing many glochids; sepals broadly ovate, acute, scarlet ; petals a little longer than the sepals, otherwise similar, persistent; stamens pinkish, exserted 1 to 1.5 cm. beyond the petals; stigma-lobes 6 or 7, greenish, exserted beyond the stamens; style swollen just . above its base into a broad disk; fruit red, about 5 cm. long, seeds about 5 mm. long and 3 mm. wide. Type locality: Jamaica and tropical America. Distribution: Cultivated in the West Indies and tropical America; its original habitat unknown. , Opuntia magnifolia Noronha (Verhandl, Batav. Genootsch. 51: 22. without description, is referred to this species by Schumann and oth Opuntia mexicana, although it has been used for more than one species, Pfeiffer’s Enumeratio (p. 150. 1837) as a synonym of O. cochenillifera. Link (Steudel, Nom. ed. 2. 1: 246. 1840) rarely maturing in greenhouse plants; 1790), published ers. The name it was not until 1703 that, by the aid of the microscope, it was definitely determined to be of insect origin. The cochineal indust established when they conquered Mexico in 1 518, and began at once As early as 1523 Cortez was ordered to obtain and send to S crown. From Mexico and Peru the industry was taken to southern Spain South Africa, New Granada (Colombia), Jamaica, and the Canary Islands. grew rapidly and was very profitable. The greatest source of the cochineal was robably the Canary Islands. In about the year 1868 more than 6,000,000 pounds, valued at $4,000,000 were exported from these islands alone, of which the largest part was sent to England. The cochineal insects were placed on the joints or branches of the cact they rapidly multiplied and in about four months were collected by b into baskets or bags. Then, after being dried in various ways, they beca of commerce. Two or three such collections were made each year. us plants, where rushing them off me the cochineal M. E. Eaton del. Fruit of Aopalea audert. t Usieer 5 ps, ; oe 2 est part of flowering joint of Mopalea cochentllifera. 4a - Upper part of flowering joint of Nopalea audert. (All natural size.) Flowering joint of Nopalea dejecta. ff ee a NOPALEA. 35 The cactuses upon which the cochineal was raised were often grown in large planta- tions called nopalries, sometimes containing 50,000 plants in rows about 4 feet apart. Since the introduction of the aniline dyes, the cochineal industry has almost dis- appeared. The cochineal colors, while brilliant and attractive, are not very permanent. According to J. J. Johnson, this plant was introduced into cultivation in England, in 1688; but according to Ray it was growing in Chelsea before that time. Illustrations: Hernandez, Nov. Pl. Hist. 78 and 479. f. 1. 1651, as Nopalnochetzli; Andrews, Bot. Rep. 8: pl. 533; Curtis’s Bot. Mag. 54: pl. 2741, 2742; Descourtilz, FI. Pict. Antilles 7: pl. 516, all as Cactus cochenillifer. Cycl. Amer. Hort. Bailey 1: 205. f. 308; Gard. Chron. III. 34: 92. f. 41; Pfeiffer and Otto, Abbild. Beschr. Cact. 1: pl. 24, all as Opuntia cochenillifera; Forster, Handb. Cact. ed. 2. f. 3, as Opuntia coccifera; Dillenius, Hort. Elth. pl. 297, as tuna, etc.; Agr. Gaz. 25: pls. opp. p. 884; Amer. Garden 11: 457; Martius, Fl. Bras. 4’: pl. 60. Schumann Gesamtb. Kakteen f. 109, B. Plate Iv, figure 1, shows a plant which flowered in the New York Botanical Garden in 1912. | 2. Nopalea guatemalensis Rose, Smiths. Misc. Coll. 50: 330. 1907. ‘Tree-like, 5 to 7 meters high, branched, sometimes nearly to the base; joints bluish green, ovate to oblong, 15 to 20 cm. long; areoles numerous, filled with short white wool; spines 5 to 8, unequal, nearly or quite porrect, white or sometimes rose-colored, the longest 2.5 to 3 cm. long; leaves small, linear, reflexed; flower, including ovary, 5 to 6 cm. long; sepals ovate, thickened; petals red; fruit 4 to 5 cm. long, clavate, red, more or less tuberculate, deeply umbilicate, without prominent glochids; seeds irregular, 4 mm. broad. - Type locality: El Rancho, Guatemala. Distribution: Arid valleys of Guatemala. Illustrations: Safford, Ann. Rep. Smiths. Inst. 1908: f. 13, 14; Smiths. Misc. Coll. 50: pl. 41, 42. , Figure 39 illustrates joints of a plant obtained from Frank Weinberg in 1910. : 41g. 40.—Nopalea lutea. Xo.4. Fic. 39.—Nopalea guatemalensis. Xo.4. Fic. 40 op 3. Nopalea lutea Rose, Contr. U. S. Nat. Herb. 12: 405. 1909. with a short, definite trunk and several large, te to elliptic or oblong, 10 to 22 cm. long, pale filled with short brown wool; spines weak, m. long; petals red, 2 cm. long; More or less arborescent, 5 meters high or less, lateral, more or less spreading branches; joints obova green, slightly glaucous; areoles about 2 cm. apart, large, yellow, acicular or bristle-like, the longest 4 cm. long; flowers 5 ¢ 36 THE CACTACEAE. ovary with numerous prominent areoles filled with yellow bristles; fruit red, 4 cm. long; seeds 4 to 5 mm. in diameter. Type locality: Near El Rancho, Guatemala. Distribution: Guatemala, Honduras, and Nicaragua. This species, although not discovered until 1907, is very common, extending from altitude 300 meters at El Rancho to altitude 1,100 meters near Aguas Calientes. Accord- Fic. 41.—Nopalea dejecta ing to Mr. Charles C. Deam, who has explored extensively in Guatemala, the plant when growing on river sand-bars is low, but in rich soil is tall. Our reference of this species to Nicaragua is based on a specimen collected by A. S. Oersted in 1845-1848 between Granada and Tipitapa. The joints of this, however, are nearly orbicular or a little longer than broad, with numerous brown spines and glochids More material may show that this specimen should be referred elsewhere. Illustration: Contr. U.S. Nat. Herb. 12: pl. 58. Figure 40 shows a joint of a plant from Guatemala, received from F. Eichlam in 1911. — as aeenenhaneneeneceasatantatesits NOPALEA. 37 3a. Nopalea gaumeri sp. nov. (See Appendix, p. 216.) _= 4. Nopalea auberi (Pfeiffer) Salm-Dyck, Cact. Hort. Dyck. 1849. 64. 1850. Opuntia auberi Pfeiffer, Allg. Gartenz. 8: 282. 1840. Often 8 to 10 meters high, with a cylindric, jointed trunk, never very spiny, but the areoles bearing tufts of brown glochids; branches often at right angles to the stem; joints narrow, thick, 3 dm. long, bluish green and glaucous; areoles circular, about 2 mm. broad, bearing short white wool and later a tuft of brown glochids; spines, when present, 1 or 2, subulate, the upper one about twice as long as the other, white or nearly so, with brownish tips, the longest one 2 to 3 cm. long; flowers from base of ovary to tip of style about 9 cm. long; petals erect, closely embracing the stamens, rose-pink, ovate-lanceolate, acuminate, 2 to 3.5 cm. long; filaments 12 to 15 mm. longer than the petals, white below, but the exposed parts pinkish; anthers dehiscing before maturing of stigma; style stout, light pink with a large, white, circular disk just above the constricted base; stigma- lobes green; ovary 4 cm. long, with low but very distinct tubercles and a deep umbilicus, its areoles bearing many brown glochids, these sometimes 10 mm. long. I'tc. 44.—Nopalea inaperta. X0.5. Fic. 42.—Nopalea Fic. 43.—Nopalea karwinskiara. dejecta. Xo0.33. X0.5 Type locality: Erroneously cited as Cuba. Distribution: Central and southern Mexico. . Illustration: Addisonia 1: pl. 10. . Plate rv, figure 2, represents a flowering joint of a plant obtained by W. E. Safford at Guadalajara, Mexico, in 1907; figure 3 shows young fruit of the same plant; plate v is from a photograph taken by Dr. MacDougal near Mitla, Mexico, in 1906. 5. Nopalea dejecta Salm-Dyck, Cact. Hort. Dyck. 1849. 64. 1850. Opuntia dejecta Salm-Dyck, Hort. Dyck. 361. 1834. Plant 1 to 2 m. high, with a definite trunk, very spiny, the old areoles often bearing 6 or 8 spines joints narrow, 10 to 15 cm. long, only moderately thick, often drooping, bright green ev en eee bearing usually two somewhat spreading spines at an areole; spines at hirst pa - yen wer P pet X in age gray, the longest 4 cm. long; flower, including ovary and style, 5 cm. long; sepals se; erect, dark red; stamens long-exserted, dark red. Type locality: Erroneously cited as Havana, Cuba. a Distribution: Common in cultivation in tropical America; perhaps native in Panama. Opuntia diffusa and O. horizontalis are both given by Pfeiffer (Enum. Cact. 159. 1837) as synonyms of this species. 38 THE CACTACEAE. Illustrations: Agr. Gaz. N. S. W. 25: pl. opp. p. 138; Roig, Cact. Fl. Cub. pl. [6], this st Plate Se eure 4, shows a flowering joint of a plant obtained from Mr. S. F. Curtis in 1897. Figure 41 is from a photograph taken by Dr. Juan T. Roig in the Havana Botanical Garden, Cuba; figure 42 shows a joint of a plant collected by Mr. J. F. Cowell at Panama in 1905. 6. Nopalea karwinskiana (Salm-Dyck) Schumann, Gesamtb. Kakteen 752. 1898. Opuntia karwinskiana Salm-Dyck, Cact. Hort. Dyck. 1849. 239. 1850. A tree, 2 meters high or more, with a definite jomted terete spiny trunk; joints oblong, 1.5 to 3 dm. long, light dull green, only slightly glaucous; leaves elongated, acute; areoles distant; spines 3 to 7 from an areole, porrect, 1 to 2 cm. long, pale yellow to nearly white; glochids yellow, numerous, caducous; flowers red, 11 to 12 cm. long; ovary deeply umbilicate, 3 cm. long. Type locality: In Mexico. Distribution: Mexico. Fics. 45, 46.—Flower of Tacinga funalis. X Pereskia poeppigti ¢alm-Dyck, Cact. Hort. Dyck. 1849. 252. 1850. _ Shrubby, much branched, prostrate, lorming dense cespitose masses 1 meter broad; joints spiny to the bases, cylin- dric, 6 cm. long or more, 1.5 cm. in diam- eter; leaves cylindric, green, 4 to 6 mm. long; spines 3 from each areole, the 2 late- tals very short, the central one 1.5 to 2 cm. long; flowers terminal, yellow; fruit oblong to obovoid, about 5 cm. long and 3 cm. thick. Type locality: In Chile, without definite locality. Distribution: High mountains of Chile. Lllustrations: Schumann, Ge- samtb. Kakteen f. 108, B, ¢.; Gar- tenflora 32: pl. 1129, f. 1 to 4, as Opuntia poeppigii; Dict. Gard. Nich- olson 3: f. 82, as Pereskia poe ppigit. Figure 51 is from a fruit obtained by Dr. Rose at the National Museum of Chile, Santiago, in IgI4. Fic. 53.—Maihuenia tehuelches 42 THE CACTACEAE. 3. Maihuenia brachydelphys Schumann, Gesamtb. Kakteen 756. 1898. Cespitose, prostrate; joints cylindric or nearly ellipsoid, naked below, 2 cm. long; spines 2 or 3, one much stouter and longer, yellow except at base and there brown; leaves terete, 2 to 3 mm. long; areoles circular, full of white wool; flowers usually from the tips of joints, red, 3.5 cm. long. Type locality: Pasco Cruz, Argentina, 34° south latitude, province of Mendoza. Distribution: Western Argentina. Opuntia brachydelphys Schumann is mentioned by Kuntze (Rev. Gen. PI. 37: 107. 1898) by name only. Illustration: Schumann, Gesamtb. Kakteen f. 108, A. Figure 52 is copied from Schumann’s illustration above cited. 4. Maihuenia valentinii Spegazzini, Anal. Mus. Nac. Buenos Aires II. 4: 289. 1902. Shrubby, 1 to 2.5 dm. high, dull green; joints cylindric, somewhat clavate, 1 to 3.5 cm. long; leaves ovate, small; spines 3, the central much larger, 2 to 6 cm. long; flowers from near the ends of the branches, 2 cm. broad, the sepals reddish, the petals white to light yellow; stamens indefinite ; filaments white; style 6 mm. long, white, longer than the stamens; stigma-lobes 5, short, 2 mm. long, purplish; ovary globular to obconic, 5 to 8 mm. long, bearing numerous triangular fleshy leaves with long white hairs and sometimes 1 or 2 spines in their axils; fruit unknown. Type locality: Near Trelew, Chubut, Argentina. Distribution: Territory of Chubut, southern Argentina. Related to M. tehuelches and M. poeppigii, but said to be very distinct. Figure 50 is from a photograph furnished by Dr. Carlos Spegazzini. 5. Maihuenia tehuelches Spegazzini, Anal. Mus. Nac. Buenos Aires II. 4: 288. 1902. Shrubby, 2 to 3 dm. high, with many intricate branches, dull green; joints cylindric, ellipsoid to somewhat clavate, 2 to 8 cm. long by 10 to 12 cm. in diameter; leaves ovate, small, 2 to 4 mm. long; spines 3, the central one erect, 2 to 4 cm. long, the 2 lateral ones only 5 to 10 mm. long; flowers at the apex of the branches, 35 to 45 mm. broad, white to yellowish white; fruit globose, naked, dry, 2 cm. in diameter; seeds black, 3 mm. broad. Type locality: Between San Julian and Rio Deseado, Argentina. Distribution: Dry, rocky deserts, southwestern Argentina. Figure 53 is from a photograph furnished by Dr. Carlos Spegazzini. 7 ) 6. OPUNTIA (Tournefort) Miller, Gard. Dict. Abridg. ed. 4. 1754. Cactodendron Bigelow, Pac. R. Rep. 3: 102; 4:7, II, ili. 1856. Consolea Lemaire, Rev. Hort. 1862: 174. 1862. Tephrocactus Lemaire, Cact. 88. 1868. Ficindica St. Lager, Ann. Soc. Bot. Lyon 7: 70. 1880. Cacti, sometimes with definite trunks, or more often much branched from the base, the branches often spreading, reclining, or prostrate, sometimes clambering, but never climbing (one species known with annual stems); roots fibrous or rarely tuberous and large and fleshy; ultimate branches (joints or pads) cylindric to globose or flattened, usually very fleshy, sometimes woody; areoles axillary, bearing spines, barbed bristles (glochids), hairs, flowers, and sometimes glands; leaves usually small, terete, mostly early deciduous; spines solitary or in clusters, terete or flattened, naked or sheathed, variously colored; glochids usually numerous, borne above the spines; flowers usually one at an areole; ovary inferior, one-celled, many-ovuled, bearing leaves, the areoles often with spines and glochids; sepals green or more or less colored, usually grading into the petals; petals usually of various shades and combinations of green, yellow, and red (rarely white), widely spreading; stamens much shorter than the petals, sensitive; style single, thick; stigma-lobes short; fruit a berry, dry or juicy, often edible, spiny or naked, globular, ovoid or ellipsoid; seed covered by a hard, bony aril, white, flattened; embryo curved; cotyledons 2, large. T he species grow naturally from Massachusetts to British Columbia south to the Strait of Magellan. Several have been naturalized and have become very abundant locally in the Old World and in Australia. OPUNTIA. 43 ‘The type species is Cactus opuntia Linnaeus. Karl Schumann recognized 131 species in his ‘‘Gesamtbeschreibung der Kakteen,” published during the years 1897 and 1898. Many have been described since this mono- graph was published. The name Opuntia was that of a town in Greece, where some cactus-like plant is said to have grown. The genus is important economically. It furnishes the well-known tuna fruit largely imported into our eastern cities from Italy and which is common in the markets of Mexico. Some species are used for hedges, the branches of others are cooked like spinach, and still others furnish forage for stock. The species are numerous and very diverse, and have at various times been grouped by authors into several genera, while other species, now referred by us to Nopalea, Mathuenia, and Pereskiopsis, were included in Opuntia. The following genera now referred to Opuntia have been regarded as distinct from it: Consolea was described by Lemaire in 1862. He described five species, of which C. rubescens is the first and therefore the type. This group is a striking one, characterized by a pronounced cylindric trunk in old plants, with an unjointed central woody axis, peculiar semaphore-like branches at the top, and very small flowers. There are eight species of this group, described under our series Spinosissimae. ‘They are confined to the West Indies, although C. rubescens, the spineless racé of Opuntia catacantha, was originally described as from Brazil—doubtless etroneously. Tephrocactus was described by Lemaire in 1868, and to it he referred eight species of Opuntia. T. diadematus is the type species. Schumann included it in Opuntia as a sub- genus, with 15 species. They are all South American, chiefly in Argentina and Bolivia. Ficindica was established by St. Lager in 1880, based on Opuntia ficus-indica, which is clearly congeneric with Opuntia opuntia. | oo, ; In 1856 the name Cactodendron was proposed in an account of Whipple’s Expedi- tion, published in volumes 3 and 4 of the Pacific Railroad Reports. It was apparently not intended to be a formal publication, but as a definite species is indicated, the name is published. It will be of interest to record here the evidence upon which we reach this conclusion: Cactodendron Bigelow Pac. R. Rep. 3: 102; 4:7, II; Additional Notes and Corrections iii. 1856. . ieties: i i f-like joints, others of There are * * * Opuntia of many varieties; some with wide lea if shrubby form and woody fibre, which the botanist proposes to name Cactodendron.”” Pac. R. Rep. 3: 102. “Immediately on our entrance into this valley (November 19 [1856]) we found and collected a : ar ‘oi i id of woody fibre; * * *. new species of Opuntia, with prostrate, nearly terete joints, entirely devoi Lieutenant Whipple discovered the first specimen of our new C actodendron, as we were pleased to call it, to distinguish it from the O. arborescens.”” Pac. R. Rep. 4: 7- |. ; “The arborescent Opuntia, first found near Zuni, which, to distinguish from me true ©. arb Pac. cens, we called Cacto-dendron, finds its western limits near the termination o gion. .R -4: . ’ i 1 ep. 4: 10 ’ called also ‘our new Cactodendron,’ pages 7 and 11, is Opuntia 15. ‘ tia, Ww : vee whip pler i & Be new apeciee " ‘Pac. R. Rep. 4: Additional Notes and Corrections 111. Opuntias are known under a great variety of names. Among the names for te Hat jointed species, the most. common are: prickly pear in the United States: an nee have. sucker and bullsucker in the Lesser Antilles. For the round-stemme id. Griffiths has cane cactus, and such Mexican names as cholla and tasajo. Dr. Davi ubli i i ico. . cee oped, & list of names used in, Mexico is composed of at least 250 species, but more The genus Opuntia, as understood by us, he found i the species than 900 names are to be found in literature. No type specimens of many of the spe 44 _ THE CACTACEAE. were preserved by their authors, some have, apparently, been lost, and some, which are probably preserved, we have been unable to study. The genus shows a great range in stem structure, varying from cylindric to broad and flat. These extremes suggest different generic types, but these characters can not be used except in the most general way, for some species have both rounded and flattened stems. Some with round stems have flowers which suggest a closer relationship with the species with flattened stems. The habits of some of the species are very characteristic, while others show a wide range of forms. Many of the erect or tree-like forms, when grown from cuttings, develop bushy habits much unlike their normal shapes. The spines, while somewhat constant in color in some species, vary considerably in others, and the number of spines is rather inconstant. Species which are normally abun- dantly spined are sometimes naked when cultivated, while species which are normally naked sometimes develop spines in cultivation; cultivated specimens usually have weaker spines and sometimes decidedly different ones from wild plants. The flowers often vary greatly in color, as is seen especially in O. versicolor and O. lindheimeri, which show wide ranges of color forms. Some flowers vary in color during the day. We group the species known to us into 3 subgenera, 46 series, and with the following characteristics: KEY TO SUBGENERA AND SERIES OF OPUNTIA. A. Joints all terete, elongated or short, cylindric to globose. B. Branches several, many-jointed..................0cceeeees Subgenus 1. CyLINDROPUNTIA C. Spines with papery sheaths. D. Spines, at least some of them, solitary, sometimes several, acicular; ultimate branches slender, rarely more than 1 cm. thick. FE. Stem and branches conspicuously marked by flattened, diamond-shaped tubercles; fruit dry, covered with long bristle-like spines............... "suet s's Series 1. Ramosissimae (N. A.> EE. Tubercles not flattened nor diamond-shaped; fruit usually a naked berry....................... Series 2. Leptocaules (N. A.) DD. Spines always more than 1; ultimate branches stouter. E. Ultimate branches not over 2 cm. thick............... Series 3. Thurberianae (N. A.) EE. Ultimate branches, 2 cm. thick or more. F, Fruit dry....... 0. ccc eee cece nee eees Series 4. Echinocarpae (N. A.) FF. Fruit fleshy. G. Tubercles of young joints scarcely longer than broad. Series 5. Bigelovianae (N. A.) GG. Tubercles distinctly longer than broad. H. Tubercles narrow, high, laterally flattened. ..... Series 6. Imbricatae (N. A.) HH. Tubercles broad, low................00-0eeeee Series 7. Fulgidae (N. A.) CC. Spines without sheaths. D. Joints not tuberculate, or with broad or flat tubercles. in O. verschaffeltit).......0.0 00. c cece eee Series 8. Vestitae (S. A.) EE. Areoles neither long-woolly nor long-hairy. F. Joints clavate or crested...........000... 000 cece eee Series 9. Clavarioides (S. A.) FF. Joints neither clavate nor crested. G. Low, slender species, scarcely, if at all, tuberculate.. Series 10. Salmianae (S. A.) GG. Tall, stout species, the tubercles broad or flat ’ ; leaves large... 6... ce eee Series 11. Subulataz (S. A.) DD. Joints strongly tuberculate, the tubercles elevated. E. Tall, shrubby species; joints cylindric................ Series 12. Miquelianae (S. A.) EE. Low, prostrate species; joints clavate (transition to Tephrocactus) 0.0.0.0. ccc cece eens Series 13. Clavatae (N. A.) BB. Branches 1 to few-jointed, the short joints usually clustered... . Subgenus 2. TEpHRocactus (S. A.) C. Joints, at least some of them, cylindric, tuberculate, the tubercles contiguous (transition to Cylindropuntia) Series 1. Weberianae CC. Joints globose to oblong, mostly little, if at all, tuberculate. D. Areoles normally bearing many long white hairs, which often cover the whole plant....................... Series 2. Floccosae DD. Areoles without hairs. into flat, papery processes.............0..00cceeeee Series 3. Glomeratae somewhat flattened.......... 0.0.0.0... 0 cece ce ceeee Series 4. Pentlandianae OPUNTIA. 45 KEY TO SUBGENERA AND SERIES OF OPpUNTIA—continued. AA. At least some of the joints flat or compressed.................... Subgenus 3. PLATYOPUNTIA B. Stems perennial, stout or slender. C. Plants branching from near or at the base, not forming erect, cylindric unjointed trunks; flowers mostly large. D. Epidermis glabrous or pubescent, not papillose-tuberculate when dry. E. Flowers perfect; petals obovate to oblong. F. Fruit a juicy berry (exceptions in Series 5, Basilares). G. Joints readily detached. H. Joints very readily detached; low, mostly small- jointed species. I. Joints little flattened, subterete (transition to Cylindropuntia) .... 06... e ccc ccc eee Series 1. Pumilae (N. A.; S. A.) II. At least the ultimate joints distinctly flattened. J. Ultimate joints or all joints turgid.......... Series 2. Curassavicae (N. A.; S. A.) JJ. Ultimate joints flat and thin............... Series 3. Aurantiacae (S. A.) HH. Joints less readily detached; mostly taller and . larger-jointed species.................0.000 Series 4. Tunae (N. A.; S. A.) GG. Joints not readily detached, persistent. H. Areoles small, 1 to 2 mm. in diameter, not ele- vated, mostly close together................ Series 5. Basilares (N. A.) HH. Areoles larger, mostly distant. I. Prostrate or spreading species; joints relatively small. (O. austrina suberect.) J. Joints not tuberculate. K. Flowers small, brick-red................ Series 6. Inamoenae (S. A.) KK. Flowers large, yellow................... Series 7. Tortispinae (N. A.) JJ. Joints strongly tuberculate................ Series 8. Sulphureae (S. A.) I!. Bushy, depressed or tall species. J. Spines, when present, brown or yellow (white in O. setispina). K. Spines brown, at least at the base or tip. L. Bushy or depressed species. M. Fruit very small.................. Series 9. Strigiles (N. A.) MM. Fruit large. . . N. Spines acicular................-. Series 10. Setispinae (N. A.) NN. Spines subulate.................. Series 11. Phaeacanthae (N. A.) LL. Tall species, sometimes with a definite trunk (O. galapageia sometimes de- pressed). ; . M. Spines several at each areole....... i Series 12. Elatiores (N. A.; S. A.) MM. Spines, when p:esent, 1 to few at eac ; Pareole sees a Series 13. Elatae (S. A.) KK. Spines, if any, yellow, at least partially. L. Epidermis glabrous. . Areol lose together, bearing long M ‘brown wool. 7 Lecce eee eee eee Series 14. Scheerianae (N. A.) MM. Areoles distant, without long wool. Series 15. Dillenianae (N. A.) LL. Epidermis, at least that of the ovary, pubescent...........600 eee eee ees Series 16. Macdougalianae (N. A.) JJ. Spines, when present, white (or faintly yellow). K. Epidermis pubescent. ; L. Spines, when present, acicular.......... Series 17. Tomentosae (N. A.) LL. Spines several, setaceous, flexible........ Series 18. Leucotrichae (N. A.) KK. Epidermis glabrous. . L. Areoles bearing long, soft hairs LL. Areoles without long hairs. M. Joints green or bluish green. N. Spineless, or with few, usually short, Lecce eae Series 19. Orbiculatae (N. A.) Series 20. Ficus-indicae (N. A.; S. A.) NN. Spr tieast old joints $0.01... Series 21. Streplacanthae (N.A:; S. A.) MM Joints blue... 0... eevee eee eee ees Series 22. Robustae (N. A.) FF. Fruit dry, not juicy ec ce cece cece ee ne ete e eee ennees Series 23. Pol yacanthae ( N. A) EE. Flowers dicecious; petals very narrow .......---+---+> Series 24. Stenopetalae (N. A.) : Series 25. Palmadorae (S. A.) , DD. Epidermis densely papillose-tuberculate when dry.......- CC. Plants with erect, unjointed trunks, the branches with flat joints; flowers mostly small. D. Flowers small; joints spreading. . . oo, , E. Joints all flat, relatively thick.........-. tenes Series 26. Spinosissimac (N- A) EE. Some joints terete, others flat and very thin.......... Series 27. Ammophilae (NA) DD. Flowers large; joints ascending......-.------++ss00007+ Series 20. Chaffeyanae (N. A.) BB. Stems annual, very slender..........--2225000etcrctrtrtee fi 46 THE. CACTACEAE. Subgenus 1. CYLINDROPUNTIA. Includes the many-jointed species in which none of the joints is at all flattened. Series 1. RAMOSISSIMAE. - The series consists of a single bushy species, with slender joints, the nearly flat tubercles diamond-shaped and contiguous, the acicular spines, when present, usually only 1 at an areole. 1. Opuntia ramosissima Engelmann, Amer. Journ. Sci. II. 14: 339. 1852. Opuntia tessellata Engelmann, Proc. Amer. Acad. 3: 309. 1856. Frutescent, bushy, sometimes 2 meters high, the branches gray, often widely spreading, and 9 cm. long; tubercles low, slightly convex, 4-angled to 6-angled, giving the surface an appearance of being covered with diamond-shaped plates; leaves ovoid, 1 to 3 mm. long, acute; areoles on young shoots circular, with white or tawny wool and pale glochids, the upper part in age compressed into the narrow slit between the two adjoining tubercles, the lower part depressed-linear, with a slightly elevated border; spines often wanting, but when present abundant,’ usually one at each areole, rarely 2, porrect, acicular, * sometimes 6 cm. long, usually reddish when young, covered by loose, yellow, papery sheaths; flowers, including ovaries, 3 to 4 cm. long; sepals subulate, similar to the leaves of the ovary, but longer; petals greenish yellow, tinged with red, obovate, aristulate, about 1 cm. long; stamens greenish yellow; anthers orange-colored; style and stigma-lobes cream-colored ; ovary narrowly obconic, covered with emarginate tubercles, the areoles bearing wool and long glochids, but no spines; fruit dry, obovate, 2 to 2.5 cm. long, covered with clusters of weak, slender spines, appear- ing like a bur; seeds few, white, 5 mm. broad. Type locality: In California, near the Colo- rado River. Distribution: Southern Nevada, western . Arizona, southeastern California, northwestern Sonora and probably northeastern Lower Cali- : a fornia Fics. 54, 55.—Opuntia ramosissima. 0.75. The flowers of this species have been described as purple, apparently erroneously. This species is found in the most arid deserts of the southwestern part of the United States, usually growing on low hills, and is confined chiefly to.the lower Colorado; it is here rather inconspicuous and might easily be overlooked. It is one of the least succulent species of the genus, the terminal shoots soon becoming hard, and hence the plant is difficult to propagate from cuttings, and is rarely found in greenhouse collections. Opuntia tessellata cristata Schumann (Monatsschr. Kakteenk. 8:70. 1898) is a striking monstrosity which Schumann has described and figured. Illustrations: Cact. Journ. 1: pl. [1]; Cycl. Amer. Hort. Bailey 3: f. 1549; Pac. R. Rep. 4: pl. 21; 24, f. 20, all as Opuntia tessellata. Figure 54 represents a spiny branch drawn from a specimen sent by Mr. S. B. Parish from Barstow, California, in 1915; figure 55 shows a portion of an unarmed branch sent by the same collector from the same locality. . . Series 2. LEPTOCAULES. Bushy species, with slender joints, the ultimate ones 4 to 15 mm. thick, often readily detached; the flowers small. var Inhabitants of the southwestern United States, Mexico, northern South America, and one species in Santo Domingo. OPUNTIA. 47 w KEy To SPECIEs. Ultimate joints short, usually at right angles to the branches, 4 to 7 mm. thick. Bushy plants, 1.5 meters high or less; fruit small, fertile. Branches scarcely if at all tuberculate. Leaves ovoid to ovoid-subulate; young areoles long-hairy........................... 2. O. mortolensis Leaves linear; areoles not long-hairy..............................0000000 3. O. leptocaulis Branches long-tuberculate...... 0000.02... 4. O. tesajo Elongated plants, up to 2 meters long; fruit larger, sterile................................ 5. O. caribaea Ultimate joints longer, 8 to 15 mm. thick, usually at an acute angle to the branches. Joints only slightly tuberculate... 26000. c cece cece cece eee 6. O. arbuscula Joints manifestly tuberculate........0.. 000000000000 000000 ES 7. O. kleiniae 2. Opuntia mortolensis sp. nov. Slender, 6 dm. high or less, dull green, with dark blotches below the areoles, the ultimate twigs short, sometimes only 2 cm. long, 4 to 5 mm. thick, scarcely tuberculate; leaves ovate to ovate- subulate, 2 to 4 mm. long, green, with acute bronze-colored tips; young areoles with numerous, early deciduous, weak white hairs sometimes longer than the leaves, and several brown glochids ; areoles of old branches with solitary acicular spines 3 to 5 cm. long, these with tightly fitting brownish sheaths; flowers and fruit unknown. Described from No. 25360, New York Botanical Garden, received from the garden of Sir Thomas Hanbury, La Mortola, Italy, in 1906. Mr. Berger has referred this specimen to Opuntia leptocaulis longispina, but this was considered by Dr. Engelmann as the “usual western form’’ of O. leptocaulis. An herbarium specimen collected by Rose, Standley, and Russell at Empalme, Sonora, Mexico, March 11, 1910 (No. 12644), appears to be referable to this species. The short leaves and long-hairy young areoles appear to distinguish this plant from O. leptocaulis. Illustration: Gard. Chron. III. 34: f. 37, as Opuntia leptocaulis longispina. Plate v1, figure 1, represents a branch of a plant sent from La Mortola, Italy, in 1906; figure 2 shows a leafy twig of the same plant. > 3. Opuntia leptocaulis De Candolle, Mém. Mus. Hist. Nat. Paris 17: 118. 1828. Opuntia ramulifera Salm-Dyck, Hort. Dyck. 360. 1834. Opuntia gracilis Pfeiffer, Enum. Cact. 172. 1837. ; ; g Opuntia fragilis frutescens Engelmann, Bost. Journ. Nat. Hist. 5: 245: 1845. Opuntia virgata Link and Otto in Férster, Handb. Cact. 506. 1846. 348 Opuntia vaginata Engelmann in Wislizenus, Mem. Tour North. Mex. 100. 1848. Opuntia frutescens Engelmann, Bost. Journ. Nat. Hist. 6: 208. 1850. 86 Opuntia frutescens brevispina Engelmann, Proc. Amer. Acad 3* 309. OG. Opuntia frutescens longispina Engelmann, Proc. Amer. Aca 3: ae. 5° Opuntia leptocaulis brevispina S. Watson, Bibl. Index 1: 407. s a : Opuntia leptocaulis vaginata S. Watson, Bibl. Index 1: 7, £07 6. 1806 Opuntia leptocaulis stipata Coulter, Contr. U. S. Nat. Her P 3: 456. 96. Opuntia leptocaulis longispina Berger, Bot. Jahrb. Engler 36: 450. 1905. Usually bushy, often compact, 2 to 20 dm. high, but sometimes with i Short, Wiindtic aaceroline cm. in diameter, dull green with darker blotches below the areoles, with s tr ne ith short. usuall. hardly tuberculate branches; branches, especially the fruiting ones: IcKly nasil detached: leaves Spineless joints spreading nearly at right angles to the main branches, very ere les, very lender green, awl-shaped, 12 mm. long or less, acute; spines usually solitary at Yneath of spies closely fi t. white, at areoles of old branches 2 or 3 together, 2 to 5 cm. long or ness s short white wool: flowers ting or loose and papery, yellowish brown to whitish; areoles ies dle vate, acute, or cuspi date: craazish or yellowish, 1.5 to 2 cm. long including the ovary; sepals broadly Ovi noes its glochide Ovary obconic, bearing numerous small woolly brown areoles subten . y ed or varelw yellow, 10 brown; fruit small, globular to obovate or even clavate, often proli crous nd, with narrow. often to 18 mm. long, turgid, slightly fleshy; seeds compressed, 3 to 4 mm. , acute, margins. Type locality: In Mexico. s d Mexico Distribution: Southwestern United States and Mexico. ; . This species has a wide distribution for an Opuntia, extending from southern United States to Puebla, Mexico. 48 THE CACTACEAE. The great variation in the length of the spines and in the character of the spine sheaths has led to the description of several varieties. These all seem to us to merge into the one species, as above indicated. It sometimes hybridizes with O. imbricata. See C. B. Allaire’s plant from San Antonio, New Mexico. The following names, Opuntia leptocaulis laetevirens Salm-Dyck (Hort. Dyck. 184. 1834), O. gracilis subpatens Salm-Dyck (Cact. Hort. Dyck. 1849. 73. 1850), and O. lepto- caulis major Toumey (Cycl. Amer. Hort. Bailey 3: 1152. 1901) are printed but not described. Illustrations: Bull. Torr. Club 32: pl. 10, f. 9; Rep. Mo. Bot. Gard. 19: pl. 21, in part; Safford, Ann. Rep. Smiths. Inst. 1908: f. 12; Emory, Mil. Reconn. app. 2. f. 12; Pac. R. Rep. 4: pl. 20,f. 1; pl. 24, f.13 to 15, all as Opuntia vaginata. Cact. Journ. 1: 154, as Opuntia Fic. 57—Opuntia leptocau- Frc. 58.—Opuntia ca- VG. 56.—Opuntia leptocaulis in the foreground. lis. Xo.4. ribaea. Xo0.66. Jrutescens. Pac. R. Rep. 4: pl. 20, f. 4, 5; pl. 24, f. 19, all as Opuntia frutescens brevis pina. Pac. R. Rep. 4: pl. 20, f. 2, 3; pl. 24, f. 16 to 18, all as Opuntia frutescens longis pina. . Plate vi, figure 3, represents a fruiting branch from a plant collected by Dr. Rose near Sierra Blanca, Texas, in 1913; figure 4 shows a fruiting branch from another Texas plant obtained by the same collector. Figure 56 is from a photograph taken by Dr. MacDougal near Tucson, Arizona, in 1913; figure 57 represents a branch with young leafy shoots, of a specimen collected by Dr. Rose in 191 3 at Laredo, Texas. | 4. Opuntia tesajo Engelmann in Coulter, Contr. U. S. Nat. Herb. 3: 448. 1896. Bushy, 3 dm. broad and high; joints slender, indistinctly tuberculate, 2 to 5 cm. long; areoles 5 to 6 mm. apart; leaves awl-shaped, 2 to 4 mm. long, often red; spines at first 2, small dark brown 4 to 8 mm. long, either erect or reflexed; later a long central spine develops this porrect 5 cm long, yellow near the tip; flowers yellow, small, 1.5 to 1.8 cm. long, including the ovary; style whitish: stigma-lobes 5, yellowish. Type locality: In Lower California. Distribution: Central part of Lower California. The type of this little-known species should be in the herbarium of the Missouri Botanical Garden, at St. Louis, but it can not now be found. The species has been in cultivation at La Mortola, Italy, but it does not do well under cultivation. Dr C. A. Purpus, who has collected the plant in Lower California, regarded it as related to OV. ramosissima, Claiming that the stems have the peculiar marking of that species. This BRITTON AND ROSE | PLATE Vi : » 2. Branches of Opuntia moxtolensis. 5, Flowering branch of Opuntia hain la: Dy > Branches of Opuntia leptocaulis. 6. Flowering branch of Opuntia kleiniae. oe _ (All natural size.) as ee OPUNTIA. 49 relationship, however, is not shown in the La Mortola plant. With only a very meager description published and no type specimen preserved, it is difficult to decide the relation- ship of this species. No exact type locality is cited for it, but it is said to grow “among rocks, especially towards the west coast, and in the more central portions’’ of Lower Cali- fornia, where it was first collected by W. M. Gabb in 1857. We refer this species with hesitation to the series Leptocaules. Opuntia tenajo (Just’s Bot. Jahresb. 24”: 380. 1896) is doubtless an error in spelling for O. tesajo. Fic. 59.—Opuntia caribaea forming dense thickets. 5. Opuntia caribaea sp. nov. Stems 1 to 3 meters high, forming thickets in open woods and waste grounds; ultimate joints horizontal, 5 to Yo cm. long, much thicker than in O. leptocaulis, with short, elevated tuberdes; areoles large, bearing white wool and a few long caducous hairs; spines I to 3, Porrect acicu ar, 2 to 3 cm. long, covered with thin, brown, papery sheaths; glochids dark brow ne cay es sma abe 2 mm. long, acute; flowers not known; fruit red, 1.5 to 2 cm. long, usually naked but some S bearing short spines from the upper areoles, so far as known always sterile. Very common on the cactus plain about Azua and also near Barahona, Santo Domingo; collected near Azua, March 1913, by Rose, Fitch, and Russell (No. 3837, type); also Oy Paul Bartsch in Haiti, 1917; also on the northern coast of Venezuela, and on Margarita Island, and apparently in Trinidad, as indicated by a colored drawing in the Kew her barium received in 1825 from David Lockhart. The plant grows in great abundance in Santo Dom valis el appears to be indigenous. Its neat rea is O. leptocautts illers in its greater size, thicker joints, and larger Iruit. ; ce Aru: Figure 58 represents a joint of a piant collected by Rose, Fitch, and Russell at Ava Santo Domingo, in 1913; figure 59 is from a photograph of the type plan —— G. Russell. omingo with other cacti, and cer- from which it 50 THE CACTACEAE. ~~ 6, Opuntia arbuscula Engelmann, Proc. Amer. Acad. 3: 309. 1856. Opuntia neoarbuscula Griffiths, Rep. Mo. Bot. Gard. 19: 260. 1908. Forming a bush 2 to 3 meters high, often with a rounded, very compact top wit numerous short branches; trunk short, 10 to 12 cm. in diameter, with several woody branches; ultimate 10 5 to 7.5 cm. long, 8 mm. in diameter, with low, indistinct tubercles; leaves smal spines usually 1 but sometimes several, especially on old joints, porrect, up to 4 cm. long, covered wi i ose tray v- colored sheaths; flowers greenish yellow tinged with red, 3.5 cm. long; fruit often proliferous, times only one-seeded. 3 a” ey Fic. 60.—Opuntia arbuscula. Type locality: On the lower Gila near Maricopa village. Distribution: Arizona and Sonora. Opuntia congesta Griffiths (Rep. Mo. Bot. Gard. 20: 88, pl. 2, f. 4, 7; pl. 8; pl. 13, f. 5. 1909), from the description, is near this species and probably a race of it. Races of the species differ in size, in armament, in the length of the tubercles, and in size and shape of the fruit. [llustrations: Ariz. Agr. Exp. Sta. Bull. 67: pl. 6, f.:2; Bull. Torr. Club 32: pl. 9, f. 3; Plant World 11"": f. 11; Rep. Mo. Bot. Gard. 19: pl. 22; 19: pl. 23, in part, this last as Opuntia neoarbuscula; Carnegie Inst. Wash. 269: pl. 11, f. 95. Plate vi, figure 5, represents a flowering branch from Professor J. W. Toumey’s collec- tion at Tucson, Arizona. Figure 60 is from a photograph taken by Dr. MacDougal near Tucson, Arizona, in 1906; figure 61 is from a photograph taken by George B. Sudworth in Santa Rita Mountains, Arizona; figure 62 shows a fruiting branch from the same collection. —* BRITTON AND ROSE %: PLATE VII , j M. E. Eaton del. 1, 3, 4 a Krieger del, 2, 5 ’ ; A.HOEN ACO. 1. Leafy branch of Opuntia kleintae. 4. Flowering branch of Opuntia echinocarpa. . Terminal branch of Opuntia vivipara. 5. Fruiting branch of Opuntia versicolor. 2 3. Branch of Opuntia parryt. (All natural size.) ee ree OPUNTIA. 51 ? 7. Opuntia kleiniae De Candolle, Mém. Mus. Hist. Nat. Paris 17: 118. 1828. Opuntia wrightit Engelmann, Proc. Amer. Acad. 3:308. 1856. _—Opuntia caerulescens Griffiths, Rep. Mo. Bot. Gard. 20: 86. 1909. Stems pale, glaucous, sometimes 2.5 meters tall, woody at base; tubercles long; areoles large, a little longer than wide, filled with white wool from the very first; spines usually 1, but sometimes more, from the base of the areole, covered with yellow sheaths, on old joints accompanied by several bristle-like spines from the lower margin of the areole; glochids yellow to brown; leaves linear, 15 cm. : long, aeute; flowers 3 cm. long, purplish; petals broad, rounded at apex; fruit red, 2 to 2.5 cm. long, long persisting; seeds 4 to 5 mm. broad. Fic. 61.—Opuntia arbuscula. Fic. 62.—Opuntia arbuscula. Xo.75. Type locality: In Mexico. Distribution: Texas to central Mexico. Opuntia kleiniae was originally described as without tubercles on the stems, which has raised the question whether the plant bearing this name is properly referred; in this respect O. arbuscula answers the description better, but it is very doubtful whether O. arbuscula could have been known at that time. Opuntia kleiniae has long been in cultivation and is to be seen in most collections. _ In 1910 Dr. Rose collected near Alamos, Mexico, an Opuntia very similar in habit and joints to O. kleiniae, but much more spiny. Opuntia kleiniae cristata (Cat. Darrah Succ. Manchester 55. 1908) is a garden form. O. kleiniae laetevirens Salm-Dyck (Cact. Hort. Dyck. 1849. 73. 1850) is only a name. Illustrations: Abh. Bayer. Akad. Wiss. Miinchen 2: pl. I, Sec. 7, f. 9; Rep. Mo. Bot. Gard. 19: pl. 21, in part; 20: pl. 6, in part, this last as Opuntia caerulescens. at MI Plate vt, figure 6, represents a flowering branch of a specimen obtained from - Simon, of St. Ouen, Paris, France, in 1901; plate vit, gure I, represents a leafy branc of a speci lected by Dr. Rose at Ixmiquilpan, \ exico, in 1905. Two remarkable opuntias were collected in Lower California by Dr. Rose in 19IT, but as they were not in flower or fruit, and have not developed flowers since they were brought into cultivation, we are unable to describe them fully; they are doubtless o this relationship and their characters are given as follows: OPUNTIA sp. oe 5 i clambering over bushes, 10 mm. in diameter, woody below, pale. when dry te een denis peeling off; lateral branches numerous, horizontal, 52 THE CACTACEAE. short (2 to 6 cm. long); areoles on old stems bearing 3 or 4 long (2 to 4. cm. long) needle-like brownish spines; young areoles usually with a single spine each, filled with brown wool; glochids brown, numer- ous sheaths on young spines straw-colored, soon deciduous; flowers and fruit unknown. Description based on field notes and on living and herbarium specimens. Collected by Dr. Rose on Santa Cruz Island, Gulfof California, April 1, 1911 (No. 16845). OPUNTIA sp. Procumbent, forming an indeterminable mass of spiny branches, 3 to 10 dm. in diameter; old stems woody, smooth, brown, and shiny, 2 cm. in diameter; branches 10 to 20 cm. long, bluish green; spines of two kinds; the 2 to 4 principal ones long (2 to 3 cm. long), needle-like, at first covered with thin yellow sheaths, straw-colored when young, becoming purplish, finally fading to gray; secondary spines 4 to 6, radial, inconspicuous; glochids brownish; flowers and fruit unknown. Description based on field notes and living and herbarium specimens. Collected by Dr. J. N. Rose on East San Benito Island, off the coast of Lower Cali- fornia, March 9, 1911 (No. 16085). This is, doubtless, the plant referred to by Walton (Cact. Journ. 2: 137. 1899) as O. ramosissima, but it is not that species. Series 3. THURBERIANAE. Bushy, arborescent, or depressed species, with slender joints, the ultimate ones tuberculate, about 2 cm. thick or less, the areoles bearing several spines. We recognize 8 species, 7 of them natives of the southwestern United States and northern Mexico, and 1 in Lower California. KEY TO SPECIES. Bushy or arborescent species, 6 dm. high or higher. Tubercles narrowly oblong, 1 cm. long or more. Joints readily detached........ 6.6.0... e eee eect ete teense tenet t ents s ees 8. O. vivtpara Joints not readily detached. Longer spines 2.5 cm. long or longer. Flowers orange to scarlet.........0.. 000 e eee eee eens 9. O. tetracantha Flowers purple. .... 2.00.00 00 c cee eee eee e ene e eee nes 10. O. recondita Spines 2 cm. long or less..... 2-66-60 n et tees 11. O. thurbert Tubercles low, oblong, 6 to 8 mm. long.............. 500s eee eee eee ete etree 12. O. clavellina Depressed species, 6 dm. high or less. Spines yellow or brown; flowers green or tinged with yellow. Spines yellow, up to 5 cm. long; petals 1 to 1.5 cm. long..............-.. 00 eee e eee 13. O. davistt Spines brown, 2.5 cm. long or less; petals 2 to 2.5 cm. long... 2... eee 14. O. viridiflora Spines white; flowers yellow. ...... 06-0506 002 c eee eee rete teen tee eet tenets 15. O. whipplet §. Opuntia vivipara Rose, Smiths. Misc. Coll. 522153. 1908. Plant 2 to 3.5 meters high, usually several strong branches from the base, 8 to 10 cm. in diame- ter, much branched above, but not compactly so; old stems with rather smooth bark; young branches bluish green, slender, 1 to 2 cm. long, 10 to 12 mm. in diameter; tubercles low, oblong, 15 to 20 mm. long; areoles when young bearing a dense cushion of yellow wool with few or no glochids; spines 1 to 4, 2 cm. long or less, porrect or ascending, covered with straw-colored sheaths; leaves small, terete, acutish, purple; flowers numerous, borne in clusters at the top of the branches, purplish; ovary strongly tuberculate, bearing white deciduous bristles; fruit oblong, 4 to 6 cm. long, smooth, with a somewhat depressed umbilicus, yellowish green, spineless; seeds white, very thick, 5 mm. long. Type locality: Near Tucson, Arizona. Distribution: Known only from type locality. The relationship of this species is doubtful; it resembles certain garden forms of O. tetracantha, but differs from typical forms of that species in its much larger fruit and seeds, different armament, and habit. The type grew associated with O. spinosior and O. versicolor, but there is no indication that it is the result of hybridization of those species. Illustrations: Smiths. Misc. Coll. 52: pl. 12; Plant World 11'°: f. 12. Plate vu, figure 2, represents a branch drawn by L. C. C. Krieger at the Desert Botanical Laboratory, Tucson, Arizona; plate vu, figure 1, is from a photograph of the type plant taken by Dr. MacDougal in 1908. D ROSE N ly NA ®) BRITTC $ » ene a, ivipara, near Tucson, Arizona. o) e pe plant of Opuntia A much-branched plant of Opuntia 1. Ty versicolor. 2 OPUNTIA. 53 9. Opuntia tetracantha Toumey, Gard. and For. 9: 432. 1896. Low bush, 5 to 15 dm. high, branching; central stem woody, 5 to 8 cm. in diameter; young joints 23 to 30 cm. long, ro to 15 mm. in diameter, purplish; tubercles at first prominent, elongated, 16 to 22 mm. long; areoles bearing wool, light brown glochids, prominent glands and spines; spines 3 to 6, usually 4, slender, somewhat deflexed, 2 to 3.5 cm. long; flowers greenish purple, 1.5 to 2 cm. broad; fruit 2 to 2.5 cm. ong, yellowish orange to ‘‘scarlet,” nearly smooth, but rarely bearing a few spines, deeply umbilicate; seeds 3 to 5 cm. broad, with irregular faces and a thick, spongy commissure. Type locality: Five miles east of Tucson, Arizona. Istribution: Known only from the region about Tucson, Arizona. The species was originally compared by Mr. Toumey with O. thurberi, with which he thought it to be closely associated, but differing in ‘‘its longer, more strongly deflexed spines, smaller and different-colored flowers.”’ The type specimen was not indicated, but Toumey’s own plant, collected in 1 895, which was recently purchased by the U. S. National Herbarium, is doubtless the type. Illustration: Bull. Torr. Club 32: pl. 9, f. 2. Plate 1x, figure 1, shows a joint painted by L. C. C. Krieger at the Desert Botanical Laboratory, Tucson, Arizona. 10. Opuntia recondita Griffiths, Monatsschr. Kakteenk. 23: 131. 1913. ‘“‘A stout broad-branched shrub, 1 to 1.5 meters in height; trunk cylindric, 4 to 7 cm. in diam- eter, with constrictions corresponding to each year’s growth, with gray bark, and having a few lateral, easily detachable, weakly spined joints about 10 cm. long, the remaining joints being 20 to 30 cm. long, very spiny, in the second year about 2 cm. in diameter, tuberculate; tubercles forming a ridge, flattening out below, above extending precipitously, about 2 to 5 cm. long, 5 to 6 mm. wide, and 4 to 5 mm. high, remaining recognizable three years, and then disappearing; areoles broadly obovate, 5 to 6 mm. in the longest diameter, in age becoming larger and more prominent, forming new wool for several years; glochids yellow, in a thick 3 mm. long cluster on the upper part of the areole, also smaller clusters on the other parts of the areole, mostly at the base of the longest and most central spine; spines first 2 to 4, later 6 to 8 or 10, upr ght, spreading, 2.5 to 5 cm. long, in cross-sec- tion weakly circular, gray at the base, becoming deep red- dish brown at the tips, surrounded the entire length by a loose, comparatively bright sheath; between the spines are scattered a few dirty-black, sheathless bristles about 6 mm. long; leaves subulate, finely tipped, terete, 12 to 20 mm. long. “Flowers bright purple, when open about 2.5 cm. in diameter; petals finely and irregularly serrate, inconspic- uously but finely irregularly notched; sepals thick, trian- gular pointed, greenish purple; anthers greenish with purple tinge; pistil greenish at base, with purple tinge above; stigma-lobes 6, white; ovary obovoid, tuberculate, with small areoles, 2 mm. in diameter, short greenish brown glochids 1 to 2 mm. long, and 1, 2, or 3 brown, caducous spines sheathed in part; fruit not deciduous, 3 to 3.5 by 2 to 2.4 cm., large, greenish yellow with a reddish tinge on the outer- most side, only weakly tuberculate in the second year, with projecting brownish glochids 3 mm. long; seeds white, thick, mostly flat but often lightly angled with narrowly thickened edges, and often somewhat concave.”’ Type locality: a Perla, Mexico. Distribution: Known only from type locality, and, to us, only from the description of which the above “|. 7 63.Opuntia thurberi. Natural size. is a translation by Mr. Russell. 11. Opuntia thurberi Engelmann, Proc. Amer. Acad. 3: 308. 1856. ‘oh io .5 to 2.5 dm. long, ro to 12 Large bushy plants, 2 to 4 meters high; joints slender, elongated, 1.5 em. in diameter "tubercles 1.5 to 2 cm. long, flattened laterally; leaves linear, 6 to 8 mm. long, spread- 54 THE CACTACEAE. ing; spines 3 to 5, short (10 to 12 mm. long), spreading, covered with thin, brown, papery sheaths, the lowest one stoutest; flowers 3.5 cm. broad, brownish; fruit 2 cm. to 3 cm. long, spineless; seeds nearly globular, 4 mm. in diameter. Type locality: Bacuachi, Sonora, Mexico. Distribution: Western coast of Mexico. Opuntia thurberi has long been one of our least-known species. The type, which is but a fragment, has not been clearly associated with any recent collections, but we are disposed now to believe that specimens collected on the west coast of Mexico by Dr. Rose in 1910 belong here. If we are correct, it ranges from Sonora to Sinaloa, Mexico. It is sometimes associated with Opuntia versicolor in its northern range, but is not so stout and has fewer and longer spines. Figure 63 is from a photograph of the type specimen. J 12. Opuntia clavellina Engelmann in Coulter, Contr. U. S. Nat. Herb. 3: 444. 1896. Plant 1 meter high or less, rather openly branched; ultimate joints slender, spreading or ascend- ing, somewhat clavate, 5 to 10 cm. long, a little over 1 cm. in diameter; tubercles prominent, elongated; spines 3 to 6 in a cluster, very long, covered with loose straw-colored or brown sheaths, the central one much longer and porrect; flowers yellow; fruit clavate, short, tuberculate. Type locality: Near Misién Purisima, Lower California. Distribution: Interior of central Lower California. The above description is based on the original one and on the type If the plant illus- trated as cited below belongs here, this is a very distinct species, which was referred, however, by Mrs. Brandegee to Opuntia molesta Brandegee. Illustration: Contr. U. S. Nat. Herb. 16: pl. 129, A. Of this series there is another peculiar Lower California species, perhaps nearest O. clavellina, but of different habit and spines. It also suggests O. tetracantha of Arizona. It was obtained first by Dr. Rose in 1911, but was without flowers or fruit. It may be characterized as follows: OPUNTIA sp. Stems slender (1 to 1.5 cm. in diameter), weak, often clambering over bushes, pale green in color, terete, pointed, 6 to 7 dm. long; areoles set on low tubercles, circular; chief spines 2 to 6, only slightly spreading, nearly equal, 1.5 to 2.5 cm. long, clothed with loose straw-colored sheaths (rose-colored when very young); accessory spines 3 or 4, almost bristle-like, borne from the lower parts of the areoles; glochids short, greenish when young, yellow in age; flowers and fruit not seen. Collected by Dr. J. N. Rose on Cerralvo Island, off southern Lower California, April 19, 1911 (No. 16875), and also by Nelson and Goldman on the same island in 1906 (No. 7524). NN 7 13. Opuntia davisii Engelmann and Bigelow, Proc. Amer. Acad. 3: 305. 1856. _ Plants low, 3 to 5 dm. high, much branched, their dense covering of straw-colored spines making them conspicuous objects in the landscape; terminal joints slender, 6 to 8 cm. long, about 1 cm. in diameter, strongly tuberculate; spines 6 to 12, unequal, the longest ones 4 to 5 cm. long, acicular, covered with thin sheaths; glochids numerous, yellow; flowers, including ovary, 3.5 cm. long; petals olive-green to yellow, broad, with rounded mucronate tips; ovary with large areoles bearing a few spines each; fruit 3 cm. long, somewhat tuberculate, naked; seeds not known. Type locality: Upper Canadian, about Tucumcari Hills, near the Llano Estacado. Distribution: Western Texas and eastern New Mexico. For many years this plant was not collected and the name was confused with other species, so that at one time it was supposed to extend as far west as California. It is now believed to have a rather circumscribed range. It is first seen going west on the Texas & Pacific Railroad about Colorado, Texas. ; The plant was named for Jefferson Davis, who was Secretary of War when Whipple’s report was made. i ait TA a ls a Aa iS ak a ak a aa a a ala a BRITTON AND ROSE Krieger del. 1, 6 Kako Morita del, 2to5 1. Joint of Opuntia tetracantha. 2-to 5. Flowering joints of Opuntia versicolor. 6. Proliferous fruits of Opuntia fulgida. (All natural size.) PLATE Ix A MOEN & CO OPUNTIA. 55 Illustrations: Curtis’s Bot. Mag. 108: pl. 6652; Pac. R. Rep. 4: pl. 16. { Figure 64 is copied from the second illustration above cited. 14. Opuntia viridiflora sp. nov. A low, round, bushy plant 30 to 60 cm. high; terminal joints 5 to 7 cm. long, 1.5 to 2 cm. thick, often quite fragile; areoles prominent, flattened from the sides; areoles circular, filled with short, yellow or dull-gray wool; spines 5 to 7, somewhat spreading, the longest ones 2 cm. long, dark brown in color; glochids numerous, very short, yellow; flowers at tips of branches in clusters of 3 to 8, 3.5 to 4.5 cm. long (including ovary), “‘ green, tinged with red”’; fruit strongly tuberculate, except for a few long, deciduous bristles, with a deep umbilicus; seeds smooth, white, 3 mm. broad. Fic. 64.—Opuntia davisii. Xo.5 Fic. 65.—Opuntia viridiflora. Xo.5. Fic. 66.—Opuntia whipplei. Xo.5 Collected in the vicinity of Santa Fé, New Mexico, altitude about 2,225 meters, by Paul C. Standley, July 6, 1911 (No. 6493, type) and at the same locality by T. D. A. Cock- erell in 1912, and by J. N. Rose in 1913 (No. 18776). It is quite common on the hills just north of Santa Fé about Fort Marcy, where it is one of the dominant plants, but it was not observed elsewhere in that region. og . This species differs from Opuntia imbricata with which it 1s found, in its much lower stature, more bushy habit, in its branches, spines, and smaller, differently colored flowers, different fruit, and smaller seeds. . Figure 65 represents two joints of a specimen collected by Dr. Rose at the type locality In 1913. 7 |\\ 15. Opuntia whipplei Engelmann and Bigelow, Proc. Amer. Acad. 3: 307. 1856. Opuntia whipplei laevior Engelmann, Proc. Amer. Acad. 3: 307. 1856. . . i flattened laterally, 10 to 15 Low, much branched, with long, fibrous roots; areoles prominent, ae . em. long, circular, filled with light-brown wool; glochids pale yellow, short; spines about 12, the 56 THE CACTACEAE. longest about 2 cm. long, dark brown, covered with lighter colored papery sheaths; flowers yellow, small (2 cm. broad); young ovary bearing brown spines in the axils of the leaves, fruit strongly tuberculate, spineless, 2.5 to 4 cm. long, with a deeply depressed umbilicus, sometimes with only one seed but usually many; seeds small, 4 cm. broad, smooth. Type locality: About Zuni, New Mexico. Distribution: Northern New Mexico and Arizona to southwestern Colorado and prob- ably southern Utah. Also reported by Coulter in southern California, Lower California, and Sonora, but not to be expected there. Illustration: Pac. R. Rep. 4: pl. 24, f. 9, 10. Figure 66 is copied from the illustratiOn above cited. we ye » de Tas if § eye 3 aia ie Fic. 67.—Opuntia acanthocarpa in the foreground. Photograph by MacDougal. Series 4. ECHINOCARPAE. Dry-fruited, rather stout-jointed, bushy or depressed species, the areoles bearing several spines, the flowers red, yellow, or yellowish. Four species, inhabiting the southwestern United States, Sonora, and Lower Californja. KEY TO SPECIES. Tubercles elongated, 2 to 3 times as long as wide. Fruit long-spiny, strongly tuberculate ‘Tul 1) J > ate... ee oo. ...16. O. ace ocarpa Fruit short-spiny, little tuberculate..........0.0.0.0... 0.0.00... 6 0 acanth P Tubercles short, less than twice as long as wide. TT. OQ. parryi Spines with white or straw-colored sheaths........................ 18. O. echinocarpa Spines with yellow-brown sheaths ; p yellow-brown sheaths... 0.0... 6 0.0. c eee ee 19. O. serpentina OPUNTIA. 57 >< _> 16. Opuntia acanthocarpa Engelmann and Bigelow, Proc. Amer. Acad. 3: 308. 1856. Much branched, 1.5 to 2 meters high; branches becoming woody, alternate, making a narrow angle with the trunk; terminal joints 4 to 8 cm. long, strongly tuberculate; tubercles elongated, flattened laterally; spines 8 to 25, acicular, dark brown, covered with thin and lighter colored sheaths, 2 to 3 cm. long; glochids numerous, yellow; flowers large, red to yellow, 5 cm. long, and when fully open nearly as broad; ovary rather short, turbinate, with few prominent tubercles; fruit dry, about 3 cm. long, naked below, tuberculate above, each tubercle crowned by a cluster of 10 to 12 stout spines; umbilicus broad and somewhat depressed; seeds 5 to 6 cm. broad, sharply angular. Type locality: On the mountains of Cactus Pass, Arizona, about 500 miles west of Santa Fé, New Mexico. Distribution: Arizona and California; reported also from Utah, Nevada, and Sonora. Illustrations: N. Amer. Fauna 7: pl. 7,8; Pac. R. Rep. 4: pl. 18, f. 1 to 3; pl. 24, f. 11. Figure 67 is from a photograph by Dr. MacDougal of a plant near Pictured Rocks, Tucson Mountains, Arizona. 7 17. Opuntia parryi Engelmann, Amer. Journ. Sci. IT. 14: 339. 1852. Opuntia bernardina Engelmann in Parish, Bull. Torr. Club 19:92. 1892. Low and bush-like, 2 to 4 dm. high; joints cylindric, 7 to 30 cm. long by 1.5 to 2 cm. in diameter, strongly tuberculate; tubercles 1 to 1.5 cm. long; areoles rather large, bearing light-brown wool, yellow glochids, and spines; spines about ro, dark brown, the longer ones 3 cm. long, covered with loose sheaths; flowers, several near together at ends of branches, 4 cm. long; sepals greenish or dull red; petals yellow, obtuse; stigma-lobes cream-colored; ovary tuberculate; fruit dry, ovoid, 2 cm. long, strongly umbilicate, when mature and fertile plump, otherwise more or less tuberculate ; areoles on the fruit large, filled with wool and glochids, those at top of fruit often with short spines; seeds white, 4 to 6 mm. broad, beaked, the margins channeled. Type locality: Near San Felipe, eastern slope of California Mountains—San Jacinto Mountains. Distribution: Interior valleys of southern California. This is common in some of the interior valleys of southern California, although its range has not been very definitely determined. It was first collected by Dr. C. C. Parry in 1851 and named for him by Dr. Engelmann in 1852; but when the latter again took up this name a few years later, he associated it with.a very different species, which most later writers and dealers accepted as the true Opuntia parryt. Later on Dr. Engelmann segre- gated a species which he named O. bernardina, including therein Parry s specimen, but this was not published until after his death. We therefore regard O. bernardina as a synonym of O. parryi, while the O. parryi of most collections becomes O. parishtt. We are under obligation to Mr. C. R. Orcutt for first calling our attention to this confusion. Mr. Orcutt thinks that this species is near O. serpentina, but the former has larger flowers, different spines, much less spiny fruit, and is of different habit. : Opuntia bernardina cristata Schumann (Monatsschr. Kakteenk. 12: 20. 1902), an abnormal form, has been described. Plate vn, figure 3, is from a plant co ing a leafy joint. > 18. Opuntia echinocarpa Engelmann and Bigelow, Proc. Amer. Acad. 3: 305. ia echi i _ Acad. 3: 305. 1856. Opuntia echinocarpa major Engelmann, Proc. Amer : Opuntia ot hinocarba nuda Coulter, Contr. U. S. Nat. Hep. 3 : 446. Ea Opuntia echinocarpa parkeri Coulter, Contr. U. S. Nat. ler 3 44 6. tho. Opuntia echinocarpa robustior Coulter, Contr. U. S. Nat. er - 3: 446. Opuntia deserta Griffiths, Monatsschr. Kakteenk. 23: 132. 1913. i ti Plant usually low, but sometimes 1.5 meters high, much branched and widely Spread ing wih a short woody trunk 2 to 3 cm. in diameter, in age with nearly smooth bark Joints oh. M ur “ strongly tuberculate; spines numerous, when young bright yellow, wi a ° rr ort often tipped grayish, unequally covered with thin papery sheaths; flowers yellowish, bu sepals with red; ovary short, turbinate, densely spiny especially in the upper part; fruit dry, very spiny, seeds somewhat angular, 4 mm. broad. llected by W. T. Schaller at Pala, California, show- 1856. ‘United States and Lower California. They are low, bushy plants, with 58 THE CACTACEAE. Type locality: In the Colorado Valley near the mouth of Bill Williams River. Distribution: Nevada, Utah, Arizona, California, and Lower California. Coulter has described three varieties of this species, none of which is quite typical, but without seeing more specimens we can only refer them all to the species proper. His variety parkeri seems more like a very spiny form of O. parryi. O. parkert Engelmann (Coulter, Contr. U. S. Nat. Herb. 3: 446. 1896) was published as a synonym. Mrs. Brandegee thought Opuntia.echinocarpa nuda very near O. alcahes, if not identical with it (Erythrea 5: 122). Illustrations: Pac. R. Rep. 4: pl. 18, f.5 to 10; pl. 24, f.8; Monatsschr. Kakteenk. 23: 132, the last as Opuntia deserta. . Plate vu, figure 4, is from a plant collected by Dr. Rose near the Salton Sink, Cali- fornia, showing a flowering joint. . 19. Opuntia serpentina Engelmann, Amer. Journ. Sci. IT. 14: 338. 1852. Cereus californicus Torrey and Gray, Fl. N. Amer. 1: 555. 1840. Not Opuntia californica Engelmann. 1848. Opuntia californica Coville, Proc. Biol. Soc. Washington 13: 119. 1899. Ascending, erect, or prostrate; branches slender, 2 to 2.5 cm. in diameter, bluish green, strongly tuberculate; leaves minute; tubercles elevated, 1 to 1.5 cm. long, longer than broad, flattened ; spines 7 to 20, brown, covered with yellowish-brown papery sheaths about 1 cm. long; glochids light brown; flowers close together at the top of short branches, about 4 cm. broad, greenish yellow, the outer petals tinged with red; ovary strongly tuberculate, spiny, with a depressed umbilicus; fruit dry, very spiny. Type locality: Near the seacoast about San Diego, California. Distribution: Southern California and northern Lower California. Cactus californicus Nuttall, although given in the Index Kewensis VL DAX (1: 367), was never published by Nuttall, although he did have thename S/ So8 KE in manuscript, asstated in Torrey and Gray’s “ Flora”’ in the place cited pa lF? SS above, where it was taken up as a Cereus. 7, AAS Figure 68 is from a plant collected by Mr. G. Sykes near San Za \ Be N Diego, California. x e Series 5. BIGELOVIANAE. ee ee We recognize two species in this series, natives of the southwestern short definite trunks densely covered with short, stout, very spiny branches, the spines white, straw-colored, or yellow, the tubercles, at least those of young shoots, little if any longer than broad, and considerably elevated. Their fruits are fleshy berries. KEy TO SPECIES. Larger spines numerous; upper tubercles on fruit larger than lower ones 20. O. bigelovii Larger spines 4 to 6; tubercles on fruit all alike...........0......... 21. O. cirtbe 20. Opuntia bigelovii Engelmann, Proc. Amer. Acad. 3: 307. 1856. Usually with a central, erect trunk, 1 meter high or less, with short — yy6. 68.—Opuntia ser- lateral branches, the upper ones erect; joints usually 5 to 15 cm. long, very pentina. PX0.66 turgid, with closely set areoles and almost impenetrable armament; tubercles slightly elevated, pale green, somewhat 4-sided, about as long as broad, cm. broad or less; spines, as well as their papery sheaths, pale yellow; flowers several, borne at the tips of the branches, 4 cm. long including the ovary; sepals orbicular, about 1 cm. in diameter, tinged with red; petals about 1.5 cm. long, pale magenta to crimson; ovary 2 cm. long, its large areoles bearing brown wool and heitlas acicular spines; fruit usually naked, strongly tuberculate, the upper tubercles larger than e lower. OPUNTIA. $9 Type locality: Bill Williams River, Arizona. Distribution: Southern Nevada, Arizona, California, northern Sonora, and northern Lower California. Illustrations: Ann. Rep. Bur. Amer. Ethn. 26: pl 12; Contr. U.S. Nat. Herb. 16: pl. 128, B; Hornaday, Camp-fires on Desert and Lava, facing p. 154; Journ. N. Y. Bot. Gard. 5: f. 16; Pac. R. Rep. 4: pl. 19; Plant World 11)": f. 10. Figure 69 is from a photograph by Dr. MacDougal of a plant in Pima Canyon, Santa Catalina Mountains, Arizona; figure 70 is copied from the Pacific Railroad Report above cited. \V 21. Opuntia ciribe Engelmann in Coulter, Contr. U. S. Nat. Herb. 3: 445. 1896. S One meter high or less, with numerous stout branches densely armed; ultimate joints 4 to 5 cm. in diameter, strongly and regularly tuberculate, 3 cm. in diameter; tubercles about as long as broad ‘NY \ WF 4 Na Ne a 27 BOOS . NW ADSI TAN AIRS FNM | hy Lils BeaNi\its' PX UY TY TEN Te Wa erirs DA aa INK | a SNR \ oN Fic. 70.—Opuntia bigelovii. Xo0.66. Fic. 69.—Opuntia bigelovii. 3 cm. long, covered with loose yellow sheaths, hids numerous; flowers yellow; ovary some- spineless. (5 to 7 cm. broad)* larger spines 4 to 6, stout, 2 to accompanied by several bristle-like spines or hairs; gloc what bristly; fruit strongly tuberculate, 3 to 4 cm. long, Type locality: Comondu and Loreto northward to beyond Rosario, Lower California. Distribution: Central Lower California. — Opuntia ciribe is near O. bigelovit, but di globular, slightly different fruits. Figure 71 is from a photograph of a cepcién Bay, Lower California; figure 72 1S from a drawing 0 fers from it in having less spiny stems and plant collected by Dr. Rose at the head of Con- f a joint from the same plant. 7 \ 60 THE CACTACEAE. She ii ose re 4 Py bo AY a i + pre? 5 Be Fic. 71.—Opuntia ciribe. Fic. 72.—Opuntia ciribe. Xo.8. Series 6. IMBRICATAE. The typical species are tall, much branched, very spiny. The terminal joints are fleshy and strongly tuberculate, the tubercles large and flattened laterally. The fruit is either smooth or strongly tuberculate. We recognize 8 species, natives of Mexico and southwestern United States. KEY TO SPECIES. Joints cylindric; tubercles much flattened laterally. Fruit smooth or but slightly tuberculate. Branches very stout, 5 cm. thick or more... 1.0.0... 0... eee tenes Branches relatively slender, 2 cm. thick or less. a Plant glaucous; spines 4 at an areole 4at am areole.. 66.6... eee eee ees 23. O. calmalliana Plant not glaucous; spines more than 4 at an areole 3 Fruit manifestly tuberculate. 24. O. versicolor Tall species, up to 2 or 4 meters high. Flowers small; petals 1.5 em. long.........0. 0.0.0. eee eect eee 25 Flowers large; petals 2 to 3. cm. long.... 2.00.0... 0.000 c cece cece eee ceceeeeeseeee ¢ Low species, 6dm. highorless. Flowers yellow. ........00 00 ccc eet e cnet teen eee aee Flowers rose-colored... 00... ccc ccc cee c cece cece teev eet te tebe tebe bree eg ee. 27. O. tunicata ___ Flowers rose-colored. . 20.0... 0 eee tent tne ee eee eee eee ee eee 8. O. L Joints clavate; tubercles not much flattened laterally 30. O. te 22. O. cholla . O. lloydit 26. O. imbricata 22. Opuntia cholla Weber, Bull. Mus. Hist. Nat. Paris 1: 320. 1895. Usually tree-like, 1 to 3 meters high, with a definite trunk 7 to 15 cm. in diameter; trunk very spiny at first and becoming more spiny each year for some time, but in age spineless and developing a smooth, brownish yellow bark; top of plant often dense and broad; joints often in whorls, horizontal, pale, with large compressed tubercles; spines usually numerous more or less porrect, covered with loose brownish sheaths; glochids numerous, yellow; flowers rather small, 3 cm. broad, deep purple; fruit often 4 to 5 cm. long, usually proliferous, often in long chains of 8 to 12 individuals or forming compound clusters; seeds numerous, very small, often abortive. OPUNTIA. 61 Type locality: In Lower California. Distribution: Lower California. This is one of the commonest opuntias in southern Lower California and was usually seen by Dr. Rose at every locality visited south of Magdalena Bay on the west coast and on the east coast as far north as Muleje. It is undoubtedly the plant referred to O. prolifera by Mr. Brandegee, but it differs in habit and armament from that species; the fruit of O. pro- lifera is nearly or quite devoid of seeds, while this species often has numerous small ones. In this species, as in a few other opuntias, the fruits are quite proliferous, hanging on for a number of years and usually remaining green. They are, however, easily detached, and on falling to the ground, readily take root and start new colonies. Our illustration shows some of the fruits which have already rooted and have developed young joints. The plant here described is the true ‘‘cholla’’ of the people of Lower California, and is the plant cultivated under that name by A. Berger at La Mortola from a cutting of Weber’s type speci- men, and by the late Mr. Darrah at Manchester, England. Illustrations: Contr. U. S. Nat. Herb. 16: pl. 128, A; Kar- sten and Schenk, Vegetations- bilder 13: pl. 17, B. Figure 73 is from a photo- graph of a plant collected by Dr. Rose at Cape San Lucas; figure 74 represents a joint of the same plant; figures 75 and 76 repre- sent its proliferous fruits devel- oping new joints. 23. Opuntia calmalliana Coulter, Contr. U.S. Nat. Herb. 3: 453. 1896. _. “Habit and height unknown; ‘a choll joints cylindrical, 1 to 2 cm. in Fic. 73.—Opuntia cholla. diameter, glaucous, with linear- _ ; th vell oblong crested (mostly distinct) tubercles 20 to 25 mm. long; pulvini densely covered with yellow- ish wool, and with a penicillate tuft of whitish bristles at upper edge; spines usually 4, the upper one stout and porrect, reddish with yellowish tip (as are all the spines), 2 to 2.5 cm. long (occea- sionally 1 to 2 short upper ones added), the usually 3 (sometimes 4) lower ones more slender and sharply deflexed, 1 to 1.5 cm. long (occasionally one of them longer) ; flowers apparently purple; ovary covered with very prominent woolly pulvini which are more or less bristly and spiny, but ripening into a smooth juicy obovate fruit; seeds discoid and beaked, irregularly angular, with broad commissure, about 4 mm. broad.” (Coulter, /. ¢.) Type locality: Calmalli, Lower California. Distribution: Lower California. a a Type in the Brandegee Herbarium, University of California. THE CACTACEAE. It is closely 62 Referred by Mrs. Brandegee (Erythea 5: 122) to O. molesta Brandegee. related to O. molesta, but its spines are different, though on the same general plan, and its seeds are quite different. KIS \ (| WUE Se ss — A tae ((eus 2G q"y we AQ ly xX] Yf- ig 4, F 5 RS aH 74 ° IN \ (CU Ht tty : nh) Ww. oy i ay ‘ ._ of Laie Sos \' ‘ W = WUE \\( h SS WOK Xo.66. Fics. 74, 75, 76.—Opuntia cholla. . we 24. Opuntia versicolor Engelmann in Coulter, Contr. U. S. Nat. Herb. 3:452. 1896 a Opuntia arborescens versicolor EX. Dams, Monatsschr. Kakteenk. 14:3. 1904. Bush or tree-like, 2 to 4 meters high, with a large, open top sometimes 5 meters broad; trunk and larger stems woody throughout, except the younger branches; terminal joints 10 to 20 cm. long, 2.5 cm. in diameter, variously colored, not strongly tuberculate when living; tubercles 1.5 cm. long; spines 5 to 11, 5 to 25 mm. long, dark colored, with close-fitting sheaths; glochids red- dish brown; flowers variously colored, yellow, greenish, reddish, or brown, 3 to 5.5 cm. broad; ovary tuberculate, with large areoles bearing wool, glochids, and long deciduous bristles; fruit persisting for months, sometimes for a year, 2.5 to 4 cm. long, at first somewhat tuberculate, becom- ing pear-shaped or globose, sometimes proliferous; seeds white, 5 mm. broad. Type locality: Tucson, Arizona. Distribution: Arizona and northern Mexico. This species is common on the lower foothills and is only rarely found on the mesas. It is of slow growth, propagating almost entirely from seed. As the name suggests, it has flowers of many colors; each plant has its own color and the color of the flowers is to a greater or less extent paralleled in that of the branches. The contrast in color shown by a colony of these plants is very striking and one’s first impression is that more than one species exists. Named specimens of this species were distributed by the late Dr. C. G. Pringle in pl. 9, f. 1881, but the species was not published until 1896. Illustrations: Ariz. Agr. Exp. Sta. Bull. 67: pl. 6, f. 1; Bull. Torrey Club 32: p 4 to 8; Hornaday, Camp-fires on Desert and Lava, pl. facing p. 18, 116, 320; N. Mex. Agr Exp. Sta. Bull. 60: pl. 6, f. 1; Plant World 11'°: f. 8; Sargent, Man. Trees N. Amer. f. 561. Plate vu, figure 5, represents a fruiting joint; plate vim, figure 2, is from a photo- graph taken by Dr. MacDougal near the base of the Santa Catalina Mountains, Arizona; plate 1x, figures 2 to 5, are paintings made at the Desert Laboratory, Tucson, Ari- zona, by Kako Morita, showing the range in color of the flowers. OPUNTIA, 63 25. Opuntia loydii Rose, Contr. U. S. Nat. Herb. 12: 292. 1909. Much branched, 2 to 3 meters high and nearly as broad; joints terete, 2 cm. in diameter; tubercles prominent, oblong; spines few, on last year’s joints 3, reddish, 1.5 cm. long; leaves terete, 6 to 8 mm. long; flowers 3 cm. long, opening after midday; petals 15 mm. long, dull purple; fila- ments olive-green below, purplish above; style rose-colored; stigma-lobes white; ovary yellowish, strongly tuberculate, naked; fruit 3 cm. long, yellow to orange, slightly tuberculate. Type locality: On foot slopes, Hacienda de Cedros, Zacatecas, Mexico. Distribution: Central Mexico. According to F. E. Lloyd, for whom this species was named, it is known to the Mexi- cans as tasajo macho. We have had this plant in cultivation for several years, but it does not grow well under glass; these specimens have white areoles; no glochids are developed the first Fic. 78.—Opuntia Iloydii. Photograph by F. E. Lloyd. Fic. 77.—Opuntia Noydii. year, but on old branches dark-brown bunches of glochids are developed in the upper edges of the areoles, and the several brownish spines are acicular. Illustration: Contr. U. S. Nat. Herb. 12: f. 34; pl. 25. Figure 77 represents two joints of the type specimen, figure 78 is from a photograph of the type plant. 26. Opuntia imbricata (Haworth) De Candolle, Prodr. 3: 471. 1828. Cereus imbricatus Haworth, Rev. Pl. Succ. 70. 1821. indrt t. 182. 1825. Not Lamarck. 1783. ; . ones cglindricus James, ae N. Y.2:202. 1828. Not Humboldt, Bonpland, and Kunth. 1823. I C , Prodr. 3:471. 1828. Aone ee ons Da Candolle, Mér tus. Hist. Nat. Paris 17: 118. 1828. Opuntia decipiens De Candolle, Mém. e Opuntia exuviata De Candone, aan San Opuntia exuviata angustior De Candolle, Mem. is ‘ is i118 Opuntia exuviata spinostor De Candolle, Mém. Mus. Hist. Nat Paris 17: 118. 1828. Opuntia exuviata stellata Lemaire, Cact. Gen. Nov. Sp. 67. 1s 39. eas Opuntia exuviata viridior Salm-Dyck, Cact. Hort. Dyck. 1 344. 48. M 545. eas \ Opuntia arborescens Engelmann in Wislizenus, Mem. Tour North. Mex. 90. 1848, Opuntia imbricata crasstor Salm-Dyck, Cact. Hort. Dyck. 1849. 249. 1850. Mus. Hist. Nat. Paris 17: 118. 1828. Mus. Hist. Nat. Paris 17: 118. 1828. 64 THE CACTACEAE. Opuntia imbricata ramosior Salm-Dyck, Cact. Hort. Dyck. 1849. 73. 1850. Opuntia imbricata tenuior Salm-Dyck, Cact. Hort. Dyck. 1849. 73. 1850. Opuntia vexans Griffiths, Rep. Mo. Bot. Gard. 22:28. 1912. Opuntia magna Griffiths, Proc. Biol. Soc. Washington 27:23. 1914. Opuntia spinotecta Griffiths, Proc. Biol. Soc. Washington 27:24. 1914. Tree-like, often 3 meters high or higher, with a more or less definite woody trunk 2.5 cm. in diameter; ultimate joints 2 to 3 cm. in diameter, strongly tuberculate; leaves 8 to 24 mm. long, terete; tubercles 2 to 2.5 cm. long, flattened laterally; spines 8 to 30, 2 to 3 cm. long, brown, covered with papery sheaths; flowers borne at ends of branches, 4 to 6 cm. long, sometimes 8 to 9 cm. broad, purple; ovary tuberculate, bearing a few bristles from some of the upper areoles; fruit naked, yellow, 2.5 to 3 cm. long, strongly tuberculate or, when long persistent, smooth; seeds 2.5 to 3.5 mm. in diameter. Type locality: Unknown; introduced into England by Loddiges in 1820. Distribution: Central Colorado to Texas, New Mexico, and central Mexico. The plant is hardy in southwestern Kansas, and has been recorded as a native of that State; it has existed through three winters out of doors at the New York Botanical Garden, but has made little growth. We have followed Schumann and Weber in uniting Opuntia arborescens and O. imbri- cata. As thus treated, the species has a wide geographic distribution, and in our view con sists of many slightly differing races. In its northern limits it is much smaller than in its southern range. Opuntia cristata tenuior Salm-Dyck (Cact. Hort. Dyck. 1844. 49. 1845, name only), O. decipiens major Hort. in Salm-Dyck (Cact. Hort. Dyck..1844. 49. 1845, as synonym), O. cristata Salm-Dyck (Cact. Hort. Dyck. 50. 1842), and O. stellata Salm-Dyck (Cact. Hort. Dyck. 50. 1842) are unpublished names. O.ruthei isa garden name mentioned by Berger. Opuntia exuviata major (Salm-Dyck, Cact. Hort. Dyck. 1844. 49. 1845) is an unpub- lished name. Opuntia cardenche Griffiths (Rep. Mo. Bot. Gard. 19: 259. pl. 21, in part. 1908) is described as standing between Opuntia kleiniae and O. imbricata, being stouter than the Fic. 79.—Opuntia imbricata. OPUNTIA. 65 one and more slender than the other. It resembles very closely specimens collected by Dr. Rose at Ixmiquilpan, Mexico, in 1905, which we have referred to O. kleiniae. Opuntia galeottii de Smet (Miquel, Nederl. Kruidk. Arch. 4: 337. 1858) and O. costigera Miquel (Nederl. Kruidk. Arch. 4: 338. 1858), if really from Mexico, may belong here, but the descriptions are indefinite. Dr. Schumann did not know them. Opuntia mendocienses (Cat. Darrah Succ. Manchester 56. 1908) is said to be “‘prob- ably only a form of O. imbricata.” Opuntia undulata Link and Otto (Verh. Ver. Beford. Gartenb. 6: 434. 1830) was not published. According to Pfeiffer, it is the same as O. exuviata, which we refer here. Opuntia decipiens minor (Pfeiffer, Enum. Cact. 172. 1837) is unpublished. Cactus subquadrifolius Mocifio and Sessé (De Candolle, Prodr. 3: 471. 1828) was given as a synonym of Opuntia rosea and therefore belongs here. Fic. 80.—Opuntia tunicata. Fic. 81.—Opuntia pallida. Illustrations: Agr. Gaz. N.S. W. 22: pl. opp. p- 696; Bull. U. S. Dept. Agr. 3! : pl. 5; pl. 6, f. 1; Cact. Mex. Bound. pl. 73, f. 7, 8 ; Curtis’s Bot. Mag. 135: pl. 8290; N. Mex. Agr. Exp. Sta. Bull. 60: pl. 7, f. 2; Forster, Handb. Cact. ed. 2. f. 134; Mém. Mus. Hist Nat. Paris 17: pl. 15; W. Watson, Cact. Cult. f. 85, the last three as Opuntia rosea. , ; Watson, Cact. Cult. f. 8, in part, this as Opuntia décipiens. Ann. Rep. Bur. Amer. a " 26: pl. 8, f. a; Cact. Mex. Bound. pl. 75, f. 16, 17; Gard. Chron. III. 34: f. 36; rae ‘and For. 9:f. 1; Hlustr. Fl. 2: f. 2533; ed. 2. 2: f. 2992; N. Mex. Agr. Exp. Sta, Bul 7 pl. [10]; Pac. R. Rep. 4: pl. 17, f. 5, 6; pl. 18, f. 4; pl. 24, f. 12; Rep. Mo. Bot. ar ra pl. 7, in part; all as Opuntia arborescens. Rep. Mo. Bot. Gard. 22: pl. 6, 7, in part, two as Opuntia vexans. Plate Xr, figure 1, represents a joint of a plant collected by W. L. Bray m western Texas. Figure 79 is from a photograph taken by Professor F. E. Lloyd in Zacatecas, Mexico, in 1908. 27. Opuntia tunicata (Lehmann) Link and Otto in Pfeiffer, Enum. Cact. 170. 1837. 7 _6. 1827. Cactus tunicatus Lehmann, Ind. Sem. Hort. Hamb ; 2 ; Opuntia stapeliae De Candolle, Mém. Mus. Hist. Nat. Paris 172117. 1828. Opuntia hystrix Grisebach, Cat. Pl. Cub. 117. 186 oa Opuntia perrita Griffiths, Rep. Mo. Bot. Gard. 22:33. 1912. 66 THE CACTACEAE. Very variable, sometimes low and spreading from the base and forming broad clumps, at other times 5 to 6 dm. high, with a more or less definite woody stem and numerous lateral branches; joints easily detached, sometimes short and nearly globular to narrowly oblong, 10 to 15 cm. long, strongly tuberculate; spines reddish, normally 6 to 10, elongated, 4 to 5 cm. long, covered with thin, white, papery sheaths; flowers 3 cm. long, yellow; petals obtuse; ovary often bearing long spines at the areoles, but usually naked. Type locality: In Mexico. Distribution: Highlands of central Mexico; also in Ecuador, Peru, and northern Chile. Opuntia stapeliae has long puzzled collectors and students of cacti. We are convinced now that it is only starved or stunted greenhouse specimens of the common 0. tunicata. When grown in cultivation, O. tunicata takes on abnormal shapes, for the joints, which break off easily, rarely grow to their fullsize. In its native home many small dwarf plants are found everywhere about the larger plants. We have discussed this explanation of O. stapeliae with Mr. A. Berger, and he agrees with our conclusion. No specimens of the type of O. stapeliae are preserved in the De Candolle Herbarium. The plant figured as Opuntia stapelie (?) by Goebel in Pflanzenbiologische (f. 36) does not belong here. It is erect, has strongly tuberculate joints, very short spines and narrow elongated leaves. Cereus tunicatus (Pfeiffer, Enum. Cact. 170. 1837) is given as a synonym of Opuntia tunicata, but has never been formally taken up. We believe Opuntia hystrix Grisebach, collected by C. Wright in Cuba, belongs here, probably being an escape from a garden. Dr. Rose examined the specimens in the Krug and Urban Herbarium in Berlin in 1912; the loose sheaths of the spines of these specimens are now brown, while the flowers seemed a little smaller than those of the Mexican speci- mens. ‘The flowers were described as red. Opuntia furiosa Wendland (Pfeiffer, Enum. Cact. 170. 1837) is referred to O. tunicata by Pfeiffer, while Salm-Dyck refers it to his variety O. tunicata laevior (Cact. Hort. Dyck. 1849. 73. 1850). Illustrations: Bull. U. S. Dept. Agr. 31: pl. 4; Cact. Journ. 1: October; The Garden 62: 425; Safford, Ann. Rep. Smiths. Inst. 1908: pl. 10, f. 5; Schumann, Gesamtb. Kakteen f. 2; Rep. Mo. Bot. Gard. 22: pl. 13, 14, these two as Opuntia perrita. Plate x, figure 1, represents a joint of a plant collected by Dr. Rose near Cuzco, Peru. Figure 80 is from a photograph of the same plant. 28. Opuntia pallida Rose, Smiths. Misc. Coll. 50: 507. 1908. Stems 5 cm. in diameter, about 1 meter high, with widely spreading branches, the whole plant often broader than high; old areoles very spiny, often bearing 20 spines or more, often 3 to 4 cm. long, with white, papery sheaths; young areoles bearing few spines; ovary tuberculate, the areoles either naked or bearing a few bristly spines; flowers pale rose-colored; petals 15 mm. long. Type locality: Near Tula, Hidalgo, Mexico. Distribution: State of Hidalgo, Mexico. This species is known only from near Tula, Mexico, where it was discovered by Dr. J. N. Rose in 1905, and afterwards collected near the same station by Mr. E. W. Nelson. It grows interspersed with O. imbricata, but is much lower in stature and has smaller leaves and lighter-colored flowers. It is much like O. tunicata, but that species has yellow flowers and is always smaller. Illustration: Contr. U. S. Nat. Herb. 10: pl. 17, A. Figure 81 is from a photograph of the type specimen. 29. Opuntia molesta Brandegee, Proc. Cal. Acad. II. 2: 164. 1889. __ Stems 1 to 2 meters high, or in cultivation only 6 dm. high, with few, long, spreading branches; joints clavate to subcylindric, 10 to 40 cm. long, sometimes as much as 4 cm. in diameter at the top, BRITTON AND ROSE PLATE X M. E. Eaton del. 1, 4,5 Kako Morita del. 2, 3. AMOEN & CO | ] 1. Joint of Opuntia tunicata. 2to 5. Joints of Opuntia spinosior. (All natural size.) OPUNTIA. 67 pale green, with low, broad tubercles, these elongated and often 4 cm. long or more; leaves linear 10 mm. long or less; spines few, 6 to 10, unequal, the longest ones 2.5 to 5 cm. long, straw-colored, with loose, papery sheaths; flowers purple, 5 cm. in diameter; fruit ovoid, 2.5 cm. long, somewhat spiny or naked; seeds 6 mm. in diameter, irregular in shape. Type locality: San Ignacio, Lower California. Distribution: Lower California. The type of the species is deposited in the Brandegee Herbarium, now a part of the herbarium of the University of California. Living plants have been distributed by A. Berger from La Mortola, Italy, and are now to be found in various collections. In the Index Kewensis, first supplement, this species is wrongly entered as Opuntia modesta! Figure 82 is from a photograph of a plant sent from La Mortola, Italy, to the New York Botanical Garden in 1913. Series 7. FULGIDAE. Much branched, bushy plants, usually with the termi- _nal joints very fleshy, the tubercles broad and low, about as broad as long. ‘The species, of which we recognize five, inhabit the southwestern United States and western Mexico. KEy TO SPECIES. Joints very readily detached, freely falling....... 30. O. fulgida Joints not very readily detached, persistent. Spines brown or reddish, at least at base. Branches slender; fruit not proliferous.... 31. O. spinosior Branches stout; fruit proliferous.......... 32. O. prolifera Spines white or yellow. Spines white; petals greenish yellow, 1 cm. long orl ESS 1.2.0... eee eee Spines yellow; petals red, 2 cm. long...... > 30. Opuntia fulgida Engelmann, Proc. Amer. Acad. 3: 306. 1856. Opuntia mamillata Schott in Engelmann, Proc. Amer. Acad. 3: 308. 1856. ; Opuntia fulgida mamillata Coulter, Contr. U. 5. Nat. Herb. 3: 449. 1896. Plant sometimes 3 meters high or even more, with a rather definite woody trunk 10 to 20 cm. in diameter, much branched, sometimes almost from the base, and forming a compact flattened crown; terminal joints 10 to 20 cm. long, 3 to 5 cm.in diameter, very succulent, strongly tuberculate, easily breaking off; spines 2 to 12, yellowish to brown, 2.5 to 3.5 cm. long, acicular, covered with loose, papery sheaths; glochids small, whitish to light yellow; flowers light rose, 2.5 to 3 cm. broad; petals few, obtuse; | stamens and style very short; fruit at first tuberculate, in age smooth, somewhat pear-shaped, 2 to 5 cm. long,green, usually very proliferous; seeds rather small, 4 mm. broad, often wanting. Type locality: Mountains of western Sonora, Mexico. . Distribution: Gravelly and sandy situations, southern Arizona, Sonora, and Sinaloa. We consider O. mamillata as synonymous with O. fulgida; in herbarium and green- tant differences. Professor J. J. Thornber, who has long difference between the flowers and fruits, and that there 501). Inthe field, however, 33. O. alcahes 34. O. burrageana Fic. 82.—Opuntia molesta. house specimens we can find no cons studied this group, says there is no is no difference in distribution (Ariz. Agr. Exp. Sta. Bull. 67: one can see two rather distinct forms which differ in armament, the typical plant being the more spiny. This is one of the most characteristic opuntias of southern Arizona, being very abun- dant on the valley slopes and lower foothills. It often forms dense colonies almost to the exclusion of other cacti, or it may be associated with other species, especially of Opuntia. 68 THE CACTACEAE. It is a most troublesome plant to come in contact with, for, as the sharp, barbed spines pierce the flesh, the joints easily break loose from the plant and are detached with difficulty from the unfortunate victim. The flowering season extends from early spring to September. The fruit is markedly proliferous, often developing in chains, and so persisting for several years, possibly eight or ten years, as suggested by Professor D. S. Johnson. They grow in chains of 8 or 9 fruits (12 to 14 have been reported), several chains hanging from a single joint and forming a large cluster. We have seen as many as 38 fruits (40 to 50 have been reported) in a _ single cluster, and doubtless under favorable conditions many more would be found. These juicy fruits, usually spineless, are much sought by grazing animals. According to Professor Johnson, who has studied this species several years, the seeds are not known to germinate in nature. Only by cutting away a part of the hard, bony coat could they be made to germinate in the greenhouse. The species is propagated easily by the terminal joints, which come off readily and are transported far and wide like burs, and soon strike root on reaching the soil. New plants are also started occasionally by the fruits themselves. This species appears to hybridize with O. spinosior. Illustrations: Ariz. Agr. Exp. Sta. Bull. 67: pl. 1, f. 2; Bull. Torr. Club 32: pl. 9, f. 1; Cact. Mex. Bound. pl. 75, f. 18; Gard. and For. 8: f. 46; Hornaday, Camp-fires on Desert and Lava opp. p. 42, 320; Lumholtz, New Trails in Mex. opp. p. 18; Monatsschr. Kakteenk. 18: 153; Nat. Geogr. Mag. 21: 710; N. Mex. Agr. Exp. Sta. Bull. 60: pl. 6, f. 2; Plant World 11°: f. 1, in part; 11°: f. 9, in part; Sargent, Man. Trees N. Amer. f. 559; Ariz. Agr. Exp. Sta. Bull. 67: pl. 5, f. 1; Cact. Mex. Bound. pl. 75, f. 19; Lumholtz, New Trails in Mex. opp. p. 152; Nat. Geogr. Mag. 21: 710; Plant World 11°: f. 1, in part; 11'°: f. 9, in part, the last six as Opuntia mamillata; Carnegie Inst. Wash. 269: Frontispiece; pl. 1 to 7; pl. 8, f. 76 to 79; pl. 12. Plate 1x, figure 6, represents the proliferous fruit; plate x1, figure 1, is from a photo- graph taken by Dr. MacDougal near Tucson, Arizona, showing the typical plant to the left and the less spiny plant to the right. 31. Opuntia spinosior (Engelmann) Toumey, Bot. Gaz. 25: 119. 1898. Opuntia whipplei spinosior Engelmann, Proc. Amer. Acad. 3: 307. 1856. Plants 2 to 4 meters high, tree-like in habit, with a more or less definite, woody trunk, openly branched; ultimate joints 1 to 3 dm. long, 1.5 to 2.5 cm. in diameter, often bright purple, strongly tuberculate; tubercles about 6 to 12 mm. long, longer than broad, more or less flattened laterally; spines 6 to 12, but on old branches sometimes as many as 25, 10 to 15 mm. long, diver- gent, gray to brownish, covered with thin sheaths; glochids yellowish white; flower-buds short, acute; flowers 5 to 6 cm. broad, purple to pink, ye'low, or even white; petals about 10, broad at apex, narrowed at base; style thick, cream-colored or pinkish; ovary tuberculate, bearing small, purple leaves and long, white, easily detached bristles; fruit strongly tuberculate, spineless, yellow, globose to broad'y oblong, 2.5 to 4.cm. long, with a depressed umbilicus; seeds white, 4 mm. broad, smooth, with a very indistinct marginal band. Type locality: South of the Gila River. Distribution: Arizona, western New Mexico, and northern Mexico. Opuntia spinosior neomexicana (Toumey, Bot. Gaz. 25: 119. 1898) seems to be a yellow-flowered form of this species. Mr. Toumey writes that his original material of this variety came from the low foothills north of the Rillito River near Tucson. Opuntia spinosior was described by Engelmann in 1856 as a variety of O. whipplei, to which it is only remotely related, but it was not separated until 1898, when it was described as distinct by Professor J. W. Toumey. Illustrations: Ariz. Agr. Exp. Sta. Bull. 67: pl. 1, f. 1; pl. 5, f. 2; Gard. and For. 9: f. 1; N. Mex. Agr. Exp. Sta. Bull. 60: pl. 7, f. 1; Plant World 11'°: f. 7; Sargent, Man. Trees N. Amer. f. 560. BRITTON AND ROSE PLATE XI M. FE, Eaton del. Forms of Opuntia alcahes. Opuntia vestita. ay 4 Leafy branch of Opuntia imbricata. i 5, 6. Flowering branch of Opuntia prolifera. 2. (All natural size.) OPUNTIA. 69 Plate x, figures 2 and 3, are from paintings showing different flower-colors, made at the Desert Laboratory, Tucson, Arizona; figure 4 represents a fruiting joint of a plant collected by F. Gilman at Sacaton, Arizona; and figure 5 represents a leaf-bearing joint of the same plant; plate xu, figure 2, is from a photograph of the plant in the Tucson Mountains, Arizona, by Dr. MacDougal. 32. Opuntia prolifera Engelmann, Amer. Journ. Sci. II. 14: 338. 1852. Stems 1 to 2 meters high, the trunk and old branches terete and woody; terminal joints 3 to 12 cm. long, easily breaking off, fleshy, covered with short, more or less turgid tubercles; spines 6 to 12, brown, ro to 12 mm. long; glochids pale; flowers small; sepals orbicular, obtuse, dark red; petals red; filaments yellow; style stout; stigma-lobes red; ovary I cm. long, strongly tuberculate; upper areoles bearing 2 to 6 reddish spines or the joints naked throughout; fruit proliferous, 3 to 3-5 cm. long and often without seeds; seeds, if present, large, regular, 6 mm. broad. Type locality: Arid hills about San Diego, California. Distribution: Southern California and coast of Lower California. The range of this species is not well known. We have referred here, with some doubt, specimens collected by Dr. Rose on Guadalupe Island, off the coast of Lower California, as well as specimens from the south end of Lower California, but we have seen no flowers from these Lower California collections. A peculiar form less than 5 dm. high with bluish-green joints and small seeds, from near Newport, Orange County, California, deserves further study. This species, although common in southern California, has never been fully and accu- rately described. It is often confused in collections with O. serpentina, with which it grows, although they are very different. In greenhouse specimens the joints and spines are not well developed. Illustration: Meehan’s Monthly 3: pl. 1. ak, Plate x1, figure 2, represents a flowering joint of a plant col- ‘Si yh lected by E. W. Nelson and E. A. Goldman in Lower California, A aN ke which bloomed at the New York Botanical Garden in April 1914. -y) ‘i i Figure 83 represents a joint of a plant sent from La Mortola, AN/)\ hic2 Italy, in 1912; figure 84 is from a photograph of this plant. VENTS Min KP Of this relationship, but of very different habit, is the species in Ue collected by Dr. Rose on West San Benito Island in 1911. Unfor- fl ) : ii tunately no flowers or fruits could be obtained, and hence we have eR) q x not named it here. It may be briefly characterized as follows: Ah i TX OPUNTIA sp. d/ i DS os : AN Yip Ad Low, much branched plants; joints short (10 cm. long), thick, and ¢ LZ) fleshy; leaves cylindric, 10 mm. long, acute; areoles distant, circular, aT) J bearing brown wool, tawny glochids and numerous spines; spines 6 to 7G 8, often 4 cm. long, slender, reddish brown, inclosed in loose, thin, brownish PM on 7p sheaths. Collected by Dr. J. N. Rose on West San Benito Island, off p. "bf the west coast of Lower California, March 9, 1911 (No. 16043). V2 . of 33. Opuntia alcahes Weber, Bull. Mus. Hist. Nat. Paris 1: 321. 1895. Z Plant about 1 meter high, much branched, very spiny, especially when Fic. 83.—Opuntia prolifera. old; branches terete; spines on young joints about 12, short, covered with J white or very pale sheaths; tubercles prominent, diamond-shaped ; leaves small, I cm. long, terete, somewhat bronzed; sepals small, brownish, closely imbricated, hardly spreading at tips; petals sometimes wanting, or, if present, about 1 cm. long, greenish yellow, obtuse; stamens numerous; stigma-lobes very short, 6 to 8, at first exserted beyond the sepals, yellowish ; fruit globular, small, becoming turgid in age, yellowish, more or less proliferous, the umbilicus truncated or slightly depressed. Type locality: In Lower California. Distribution: Lower California. 70 THE CACTACEAE. Plate x1, figure 3, represents a leaf-bearing joint of a plant obtained by the same col- lector on Espiritu Santo Island, Lower California; figure 4 is from a plant sent to the New York Botanical Garden from La Mortola, Italy, in 1906. Figure 85 is from a photograph of a plant collected by Dr. Rose at San Francisquito, Lower California. 34. Opuntia burrageana sp. nov. Usually low and bushy, rarely 1 meter high; stems slender, 1 to 2 cm. in diameter, densely spiny; leaves small, 2 mm. long, green, early deciduous; old stem and branches terete; young Fic. 84.—Opuntia prolifera Fic. 85.—Opuntia alcahes. joints cylindric to narrow-clavate, 15 cm. long or less; areoles closely set; tubercles rather low, not much broader than long; spines numerous, similar, spreading, rarely 2 cm. long, all covered with thin, bright-yellow sheaths; wool in areoles short, brown; glochids, when present, short, light yellow; flower 3 to 4 cm. broad; petals few, brownish red with green bases; filaments green; stigma- lobes white; ovary very spiny; fruit not proliferous, globular, 2 cm. in diameter, somewhat tuber- culate, probably dry; seeds pale, 4 mm. in diameter. Common on the hills along the coast of southern Lower California. BRITTON AND ROSE PLATE x 2. A very open plant of Opuntia spinosior. 1. Plants of Opuntia fulgida. OPUNTIA. 71 The following specimens were collected by Dr. J. N. Rose in 1911: Near Pichilinque Island (No. 16533, type); near San José del Cabo (No. 16468); near Cape San Lucas (No. 16379); on Carmen Island (No. 16630); on San Josef Island (No. 16552). Plate xIVv, figure 1, is from a plant collected by Dr. Rose on San Josef Island, Lower California, in 1911, which flowered the next year at the New York Botanical Garden. Series 8. VESTITAE. The series Vestitae contains three or perhaps four species, two of which possibly represent green- house forms of species of Tephrocactus, natives of the high Andes. ‘They are low species with elon- gated cylindric joints sometimes arising from subglobose ones, and form a connecting link between the true species of Tephrocactus and Cylindropuntia. Opuntia vestita in the field was supposed to be a form of O. pentlandii, but in cultivation it has developed quite differently: O. floccosa, a Teph- rocactus, sometimes develops like the Vestitae; one specimen which we have grown shows a slender cylindric stem with few long hairs or none. Opuntia boliviana and O. pentlandii, both from Bolivia and described at the same time by Salm-Dyck, and which we have united, seem to represent two forms of the same species, O. pentlandii being the abnormal form. ‘The same condition seems to exist in O. verschaffeltii and its variety digitalis, the variety being the normal form. Schumann had these species in his series Teretes (our series Subulatae), but O. subulata and O. cylindrica are tall woody, much branched plants. KEy TO SPECIES. Areoles with hairs; joints not or scarcely tuberculate. Joints 1 to 1.5 cm. thick; spines 2.5 cm. long or less; fruit mostly sterile.................. 35. O. vestita Joints 2.5 to 3 cm. thick; spines up to 5 cm. long; fruit many-seeded .................. . 36.0. shafert Areoles without hairs; joints distinctly tuberculate............000.0000020000 0000000 eee 37. O. verschaffeltit Of this series?. 0. cee beeen eee ee 38. O. hypsophila 35. Opuntia vestita Salm-Dyck, Allg. Gartenz. 13: 388. 1845. Opuntia teres Cels in Weber, Dict. Hort. Bois 898. 1898. Roots fibrous; stems much branched, weak, forming small clumps 3 dm. broad or less and nearly as high, fragile; joints short or elongated, becoming in greenhouse cultivation 2 dm. long or more, ob- long or cylindric, 1 to 1.5 cm. thick, very spiny, easily breaking apart; areoles circular, conspicuous, bearing short wool, spines, and several long hairs; spines about 6 in each cluster, acicular, brownish, 2 to 2.5 cm. long; leaves minute, acute; flowers small, including the ovary; 2 cm. long, deep red ; petals 1 cm. long; areoles on ovary conspicuous, filled with white wool and long hairs; fruit red, usually sterile, globular or a little longer than broad, usually naked, generally truncate at apex, often bearing small spiny joints at the areoles. Type locality: In Bolivia. Distribution: Common on the sterile hills about La Paz, Bolivia. Specimens were collected by Miguel Bang some years ago and segregated as a new species by the late Karl Schumann, but this was never published ; others were obtained by Dr. H. H. Rusby in 1885, and by R. S. Williams in rgot. It was again collected by Dr. Rose in 1914, and living plants are now growing at the New York Botanical Garden. As seen wild, it is a strange little plant, growing in low clumps, its fragile stems easily breaking apart, especially at the terminal joints. The bright red fruits remain on the parent plant until they produce a number of spiny joints, often as many as five, which, after falling off, strike roots and start new colonies. a Dr. Rose suspected at the time he collected his material that it might be Opuntia vestita, and suggested that it should be carefully compared with it. This he was not able definitely to prove in the field, but the living specimens sent to the New York Botanica Garden put out new branches which are long, slender, and cylindric, and are devoid of long acicular spines, quite unlike the wild plants but almost identical with the specimens re- ceived from La Mortola, Italy, some years ago as O. vestita. . Opuntia teres Cels must belong here, at least in part. Weber states that the flowers are very similar to O. vestita, while the fruit is said to be small, red, and proliferous, just as found in O. vestita. ‘The leaves are described as 2 cm. long, however, and there is a pos- sibility that O. exaltata may be partly represented in the description, as we find herbarium material of both species, from Bolivia, mounted on the same sheet. 72 THE CACTACEAE. Plate x1, figure 5, shows the plant collected by Dr. Rose in 1914; figure 6 is from a plant received from La Mortola, Italy, in 1912. 36. Opuntia shaferi sp. nov. Plants in clusters of 2 to 4, erect, about 3 dm. high; joints terete, 2.5 to 3.5 cm. in diameter, elongated, very spiny; tubercles low, often indistinct; leaves deciduous, 6 mm. long; areoles 1 cm. apart or less, circular, white-felted; glochids numerous, whitish from the upper margin of the areole; spines about 6 at an areole, brownish, acicular, often 4 to 5 cm. long and associated with long white hairs; flowers not known; fruit globular, about 2 cm. in diameter, bearing numerous large areoles, the areoles white-felted, with glochids and hairs, but no spines; seeds turgid, pointed at base, 4 mm. long. ee 4 re Collected by J. A. Shafer among stones between Purmamaria and Tum- baya, Argentina, February 6, 1917 (No. go). Nearest O. vestita but less cespitose, taller and larger, and with fertile fruit. A 37. Opuntia verschaffeltii Cels in Weber, Dict. Hort. Bois 898. 1898. Opuntia verschaffeltii digitalis Weber, Dict. Hort. Bois 898. 1898. Forms low, in dense clumps, much branched; joints globular to short-cylindric: 1 to 4 cm. long, somewhat tuberculate, pale green; spines 1 to 3, yellowish, weak; and bristle-like, 1 to 3 cm. long; in cultivated plants joints elongated, 6 to 21 cm: long, slender, 1 to 1.5 cm. in diameter, strongly tuberculate, spineless; glochids few, i white; areoles narrow, longer than broad, filled with short white wool. ; V2 r Type locality: In Bolivia. mn i: Distribution: Bolivia. ‘hg In 1914 Dr. Rose collected this species on the barren hills about La Paz, \ Bolivia, and from his observations it seemed to be only a form of Opuntia ("7 pentlandu. In cultivation, however, it behaves very differently from his spec- BE imens of the latter, and in fact has developed a phase very unlike its normal na type but identical with other greenhouse specimens sent out by Mr. Berger some years ago under the name of O. verschaffeltit. Opuntia digitalis Weber (Dict. Hort. Bois 898. 1898) was given as a synonym of O. verschaffeltii digitalis. j Figure 86 represents an elongated joint, from a greenhouse specimen; this SESP| grew from the short normal joint, collected by Dr. Rose near La Paz, Bolivia, 8 in 1914. ’ ) OS 38. Opuntia hypsophila Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4:509. 1905. Cespitose, branching, small, 5 to 10 cm. high, pale green; joints globose to cylindric, 1.5 to 3 cm. long; tubercles depressed; spines 3 to 5, subulate, weak, spreading, white at first, in age brownish; flowers and fruit unknown. Type locality: In the Province of Salta, Argentina, in the Andes, at an altitude of 2,500 to 4,000 meters. Distribution: Salta, Argentina. We do not know this species, but Dr. Spegazzini thought ~ = > it might be a Tephrocactus and associated it with Opuntia Frc. 86.—Opuntia verschaffeltii. verschaffeltit digitalis. X0.66. Series 9. CLAVARIOIDES. This series is the same as the Etuberculatae of Schumann and contains but a single species, recorded as a native of Chile. According to Schumann, the stems are cylindric to clavate, not tuberculate, the leaves are small and caducous, and the spines are very small and appressed. ‘The fruit is said to contain one woolly seed. 39. Opuntia clavarioides Pfeiffer, Enum. Cact. 173. 1837. Low, much branched, grayish brown, 4 dm. high or less, truncate or cristate at apex; joints not tuberculate, rather fragile, short-cylindric or clavate, 1.5 cm. in diameter ; leaves minute, 1.5 mm. OPUNTIA. 73 long, reddish, caducous; areoles minute, closely set, filled with wool and minute spines; spines 4 to 10, white, appressed; flowers 6 to 6.5 cm. long; sepals linear, pointed, reddish; petals light brown, narrowly spatulate, slightly crenate; ovary bearing minute leaves with wool and short bristles in their axils; filaments white, shorter than the petals; style white, with 7 stigma-lobes; fruit ellipsoid, 1.5 cm. long’ one-seeded. Type locality: In Chile. Distribution: Originally described from Chile, but often referred to Mexico. Very little is known of this species, although it was described as long ago as 1837, and it is rare in collections. We have never seen it in flower and have seen only one record of its flowering in cultivation. The peculiar structure of the stem, narrow petals and single lanate seed, join a combination of characters separating it from other opuntias, and lead Schumann to refer it to a distinct series which he calls Etuberculatae. The question has been raised in our own minds if this is a true Opuntia. In cultivation the plant is usually grafted on some Platyopuntia. Variety cristata is offered in the trade journals. Opuntia muicrothele, Cereus clavarioides, and Cereus sericeus are usually given as synonyms, but all these were cited by Pfeiffer (Enum. Cact. 173. 1837) as synonyms of this species at the place commonly given as their first publication. The varieties fasciata Schumann (Mon- atsschr. Kakteenk. 10: 159. 1900), fastigiata Mundt (Monatsschr. Kakteenk. 3: 30. 1893), and monstruosa Monville (Labouret, Monogr. Cact. 489. 1853) are anom- alous greenhouse forms. Illustrations: Gartenflora 44: f. 7; Monatsschr. Kak- teenk. 3: 9; 16: 169; Schumann, Gesamtb. Kakteen f. 104; Gard. Chron. III. 30: f. 75, this last as Opuntia clavarioides cristata. Figure 87 is copied from the illustration used by Schumann cited above. Series 10. SALMIANAE. This series (Frutescentes of Schumann), by some supposed to 7 be composed of five species but here treated as containing but one, Fic. 87.—Opuntia clavarioides grafted on is confined to central South America. It is characterized by another species. slender, bushy, often vine-like habit, terete branches, and red fruit, the latter crowned by proliferous spiny joints. Seeds are unknown. often resemble Opuntia leptocaulis, but the flowers are somewhat larger, sheathed. 40. Opuntia salmiana Parmentier in Pfeiffer, Enum. Cact. 172. 1837. Opuntia spegazzinii Weber, Dict. Hort. Bois 898. 1898. Opuntia albiflora Schumann, Gesamtb. Kakteen Nachtr. 152. 1903. rs high, much branched at base; branches often weak, terete, lish, etuberculate; areoles small, bearing wool, yellow glochids, several, 1.5 cm. long or less, white; flowers 2 to 3.5 kish or even scarlet; petals obovate, pale yellow to t; stigma-lobes yellowish green, fruits Greenhouse specimens and the spines are not A bushy plant, 3 dm. to 2 mete 1.5 cm. in diameter or less, often purp and spines; spines sometimes wanting, usually cm. broad, scattered along the stem; buds pin white, sometimes tinged with pink; stamens and style shor sterile, clavate, scarlet, with few or no spines, Type locality: In Brazil. 6 Distribution: Southern Brazil, Paraguay, and northern Argentina. sch ve series After careful consideration, we have combined three species of Schumann Frutescentes into one. We have examined considerable living material and all ne us: trations, but have found no grounds for separating the group into species. i ve e described ag proliferous and sterile. O. spegazzinit was supposed to be unarmed, bu 74 THE CACTACEAE. character is not constant; flower differences are described, but these are inconstant. One species, O. albiflora, has already been referred to synonymy. Opuntia salmiana is said to have come from Brazil, but no definite locality is given for it, and it has not been collected there in recent times. If really from Brazil, and there is no good reason to question this reference, it is doubtless from the southern part, possibly on the border of Paraguay; indeed, O. albiflora, one of the three, was described from a Paraguay collection; the other, O. spegazzinti, is a native of the deserts of northern Argentina. Cactus salmianus Lemaire (Cact. 87. 1868, name only) has been referred here as a synonym; as has also O. floribunda Lemaire (Cact. Gen. Nov. Sp. 68. 1839). Opuntia schickendantzit Weber, included by Schumann in this relationship, we refer to our series Aurantiacae. Fic. 88.—Opuntia salmiana. Fic. 89.—O. salmiana. Xo.6. . Opuntia wagnert Weber in Gosselin (Bull. Mus. Hist. Nat. Paris 10: 393. 1904), de- scribed without flower or fruit, is probably to be referred here; at least Roland-Gosselin believed it to be of this group. We have not seen any of the specimens from Chaco, Argentina, obtained by M. Emile Wagner in 1902. Lllustrations: Blithende Kakteen 3: pl. 123; Curtis’s Bot. Mag. 76: pl. 4542; FI. Serr. 7: pl. 670; Jard. Fleur. 2: pl. i94; Loudon, Encycl. pl. ed. 3. f. 19406; Pfeiffer and Otto, Abbild. Beschr. Cact. 1: pl. 6; Castle, Cactaceous plants f. 15; Bliithende Kakteen 2: pl. 103, this last as Opuntia spegazzinii; Hogg, Veg. King. 340. f. 111. Figure 88 is from a plant in the greenhouses of the United States Department of Agri- culture at Washington; figure 89 represents a joint of a plant collected by Dr. Rose at Cérdoba, Argentina, in 1915. : | OPUNTIA. 75 OPUNTIA MALDONADENSIS Arechavaleta, Anal. Mus. Nac. Montevideo 5: 286. 1905. Cespitose, erect; branches cylindric, entangled or intertwined; joints 3 to 10 cm. long, about 2 cm. in diameter, the terminal ones obovate-spherical, dark green to olive-colored; areoles each sur- rounded by a violet blotch, small or prominent, orbicular; spines 5 or more, stout, spreading, elon- gated, unequal, the longest one 2 to 2.5 cm. long, reddish to brown; flowers and fruit unknown. Type locality: Punta Ballena, near Maldonado, Uruguay. Distribution: Uruguay. This species, referred to the subgenus Cylindropuntia by Arechavaleta, inhabits the coast of Uruguay and is known to us only from description; we append it to the series Salmianae, but its nearest relationship may be elsewhere. Series 11. SUBULATAE. This series is confined to South America and represents a very distinct group, differing greatly from the tall cylindric-jointed species of North America. ‘They lack sheaths to the spines, and the typical species has elongated persistent leaves. Although several of the species have long been in cultivation, at least two of them being known only from garden plants; for a long time the flowers were unknown and the plants were as frequently called Cereus or Pereskia as Opuntia. KEy TO SPECIES. Leaves long-persisting, elongated. Leaves up to 12 cm. long; spines yellowish white. .... 2.0.6.0... 6000 e eee eee eee 41. O. subulata Leaves 1 to 7 cm. long; spines brownish...... 0.6.6.0. 6 500 eee eee 42. O. exaltata Leaves early deciduous, short. Stem 1 meter high; leaves 4 mm. long... 2.0.0.6 665.0 e ee eee eens 43. O. pachypus Stem 3 to 4 meters high; leaves 10 to 13 mm. long ........-- eee eee eee 44. O. cylindrica — 41, Opuntia subulata (Miihlenpfordt) Engelmann, Gard. Chron. 19: 627. 1883. 2 Pereskia subulata Miihlenpfordt, Allg. Gartenz. 13: 347. 1845. . Opuntia ellemeetiana Miquel, Nederl. Krudk. Arch. 4: 337. 1858. Opuntia segethii Philippi, Bot. Zeit. 26: 861. 1868. Lither with a simple erect stem or with several main branches from the base, 2 to 4 meters high; trunk 6 to 10 cm. in diameter, the old bark smooth and brown, its areoles bearing clusters of 8 spines or more; branches numerous, more or less clustered but not whorled, at first almost at right angles to main stem but soon erect, bright green; leaves persistent, green, nearly at right angles to branch, straight or somewhat bowed above, nearly terete, pointed, 5 to 12.5 cm. long, grooved on the under side; tubercles large, depressed, becoming obliterated on old branches, arranged in longitudinal or spiral lines, more or less diamond-shaped, but retuse at apex and pointed or attentuate below, 2 to 4 cm. long; areoles in the retuse grooves of the tubercles bearing a few short yellow spines or some- times spineless, but usually having 1 or 2 slender spines; flowers borne toward the ends of the branches; sepals reddish, minute, 4 to 8 mm. long or less; petals broader than the sepals, orange or greenish yellow; style rose-red except the whitish base, including the stigma-lobes about 3 cm. long, about as long as the longest stamens; stigma-lobes 5 or 6, slender, orange-yellow; fruit oblong, more or less persistent, 6 to 10 cm. long, leafy, with a deep umbilicus, sometimes proliferous; seeds few, 10 to 12 mm. long. Type locality: Valparaiso, Distribution: Chile is usually given as t there. It may be a native in Argentina. _ This species has long been in cultivation, it having originally been sent from Valpa- raiso, but Dr. Rose did not find it wild there or in any other part of Chile. It is rarely seen in cultivation in Chile. For many years it passed as a species of Pereskia, but in 1883 Dr. George Engelmann pointed out that it could not be retained in that genus and transferred it to Opuntia. ‘The leaves are the largest in the genus, and it has larger seeds than any other Opuntia. We have referred Opuntia ellemeetiana with very long leaves, to O. subulata, althoug did not know it and only lists it. Chile, but doubtless described from cultivated plants. he home of this plant, but it is not found wild (originally described from Chile), a species h we have never seen specimens. Schumann *Schumann says 1859. 76 THE CACTACEAE. We have been able more definitely to refer here Opuntia segethi1, for we saw not only Philippi’s type specimens in his herbarium, but also living specimens grown from Philippi’s original stock. The type specimen was from plants cultivated at Santiago, but in a later publication he states that his species grows spontaneously near Arequipa. A part of this latter material is preserved in his herbarium at Santiago, which Dr. Rose was able to study; he also examined the Arequipa plant alive, and is convinced that it is quite different, being the plant common in Peru and Bolivia described below as Opuntia exaltata. Illustrations: Engler and Prantl, Pflanzenfam. 3%: f. 56, L; Gard. Chron. III. 34: f. 33, 38; Monatsschr. Kakteenk. 8: 7; 9: 183; Schumann, Gesamtb. Kakteen f. 103; Neub. Gart. Mag. 1893: 291, this as Pereskia subulata; Bot. Zeit. 26: pl. 13, C. f. 1; Gartenflora 32: pl. 1129, f. 5, the last two as Opuntia segethit. Figure go is from a photograph of a plant at the New York Botanical Garden grown from a cutting brought by Mrs.H. L. Britton from the Riviera, Italy, in 1907. 42. Opuntia exaltata Berger, Hort. Mortol. 410. 1912. Stem 2 to 5 meters high, with a definite trunk 5 to 30 cm. in diameter when well grown, much branched; ultimate joints fleshy, easily detached, somewhat curved upward, clavate, strongly tuber- culate; tubercles large, 1.5 to 3 cm. long, more or less diamond-shaped, elevated, and rounded; areoles rounded, filled with short white wool; glo- chids often wanting, when present brown; leaves fleshy, terete, 1 to7 cm. long; spines on young joints 1 to 5, mostly 1 to 3, dark yellow or brownish, unequal, the longest ones 5 cm. long; spines on old wood numerous, sometimes 12 or more, often 13 cm. long, brown, with roughened tips; flowers, in- cluding ovaries, 7 cm. long; sepals and petals brick- red; outer sepals ovate, small, the inner ones pass- ing into petals; petals 2 cm. long, broadly obovate to broadly spatulate, sometimes nearly truncate at apex; stamens numerous, short, pinkish above, nearly white below; style swollen below, pinkish; stigma-lobes greenish; ovary 4 cm. long, deeply umbilicate, with large flat tubercles; areoles on ovary circular, filled with short brown and white wool, long, loosely attached brown spines, and a few shorter glochids, and subtended by small, tardily de- ciduous leaves; fruit green, pear-shaped, 9 cm. long, ; usually sterile; seeds large, irregular, 10 mm. broad. Fic. 90.— Opuntia subulata. Type locality: Not cited; described from cultivated plants. Distribution: Ecuador, Peru, Bolivia, and probably northern Chile. This Opuntia is called pataquisca by the Cuzco and Arequipa Indians, and is also known as espina. This species was the most widely distributed Opuntia seen by Dr. Rose on the west coast of South America; but it is difficult to decide whether it is really native there, for it is widely cultivated as a hedge plant in many places. It seems to be native along the upper Rimac of central Peru; at least it is well established on the hills. Although very common in southern Peru and about La Paz, Bolivia, it is probably introduced for it grows only about towns and cultivated fields and seems never to produce fertile fruit. About Cuzco it is likewise cultivated, but may be a native there also, for the fruit is generally fertile. Ce ee dae ee A he ae a oe ee eee et a ae Ae Pas Pete cia ERE AUTO penta iain Genital acu oan j BRITTON AND ROSE PLATE XIII —* . ‘ 3 ay a | ‘ " o- ¢ a8 > —_* "eS ¥, e x 4 ? 4 ‘*. * ; a oo 1. Opuntia exaltata as seen in the highlands of Peru. 2. Clump of Opuntia floccosa as it grows in the valleys of the Andes of eastern Peru. OPUNTIA. 77 Opuntia maxillare Roezl (Morren, Belg. Hort. 24: 39. 1874), published without description and probably collected in the high mountains above Lima, may belong here. Opuntia cumingit, of European gardens, belongs here. It was briefly mentioned in the journal of the Berlin Cactus Society (Monatsschr. Kakteenk. 7: 160. 1897), but not formally described. Schumann referred it to O. pentlandi1. This species is near Opuntia subulata, but probably is distinct, although it is not always easy to distinguish them in greenhouse plants. Berger speaks of the similarity of the two as follows: ‘This new species stands very close to O. subulata, and may be easily mistaken for it, but when grown side by side the differences are quite obvious. O. exaltata is a taller plant with generally longer branches, and somewhat glaucous instead of grass-green. ‘The tubercles are more elongated and differently marked. The leaves are shorter, the spines, when young, are not white, but yellowish brown, generally stouter and stiffer. I have not yet seen a flower of it. It is an old inhabitant of our gardens.” Plate x1, figure 1, is from a photograph taken by Hiram Bingham, July 7, 1912, near Tipon, Cuzco Valley, Peru, showing the plant near the upper left-hand corner; plate xv, figure 1, repre- sents a leaf-bearing joint of a plant sent to the New York Botanical Garden from La Mortola, Italy, in 1915; figure 2 represents the lower part of a fruiting branch obtained by Dr. Rose at Cuzco, Peru, in 1914. 43. Opuntia pachypus Schumann, Monatsschr. Kakteenk. 14: 26. 1904. Plant about 1 meter high, much branched and candelabrum-like; branches cylindric, 3 to 5 cm. in diameter, either straight or curved, marked with broad tubercles; leaves subulate, pointed, constricted at the base, 4 mm. long, early deciduous; areoles circular, borne at the upper edges of the tubercles, 4 mm. in diameter, filled with short wool; spines 20 to 30, subu- late, 5 to 20 mm. long; glochids yellow; flowers scarlet, 7 cm. long, including the ovary; petals variable, the longest ones 1.4 cm. long; style very thick, 9 mm. long; stigma-lobes 5 mm. long; ovary more or less spiny. Type locality: Near Santa Clara, Peru. Distribution: Central Peru, near the coast. We know this species only from the description and illustra- tions. In 1914 Dr. Rose made several unsuccessful efforts to find it at Santa Clara, the type locality. Illustrations: Engler and Drude, Veg. Erde 12: pl. 5°; Monatsschr. Kakteenk. 14: 27. Figure 91 is copied from the second illustration above cited. Fic. 91.—Opuntia pachypus. 44. Opuntia cylindrica (Lamarck) De Candolle, Prodr. 3: 471. 1828. Cactus cylindricus Lamarck, Encycl. 1: 539. 1783. . Cereus cylindricus Haworth, Syn. Pl. Succ. 183. 1812. . . . More or less branched, 3 to 4 meters high, the old trunk becoming smooth; joints cylindric, obtuse at apex, green, with slightly elevated tubercles; leaves deciduous, 10 to 13 mm. ong, ere 7 acute; areoles depressed, filled with white wool, bearing some long hairs and at first 2 or 3, a om are ; more, short white spines (spines often wanting on greenhouse plants) ; flowers appearing Jus be on the ends of the terminal branches, small, inconspicuous, about 2.5 cm. broad, scarlet; petals sma l erect, obtuse; stamens numerous; style slender, 2.5 cm. long; ovary strongly tuberculate, depresse at apex; fruit about 5 cm. long, yellowish green; seeds more or less angled, 4 to 6 mm. in diameter. Type locality: In Peru. Distribution: Highlands of Ecuador and Peru. The home of this species is usually given by recent write described it first in 1783, said it came from Peru. Dr. Rose, rs as Chile, but Lamarck, who who visited Peru and Chile in 78 THE CACTACEAE. 1914, was not able to find it wild in either country but found it abundant in Ecuador in 1918. This species was introduced into England in 1799, but flowers were not known until about 1834. There are two abnormal forms in cultivation which are offered under the names variety cristata and monstruosa. Several varieties of this species are given in catalogues: cristata (Haage and Schmidt, Haupt-Verzeichnis 1908: 228. 1908); cristata minor Haage and Schmidt (Verzeichnis Blumenzwiebeln 1913: 37. 1913); and robustior (Haage and Schmidt, Haupt-Verzeichnis 1908: 228. 1908). Illustration: Curtis’s Bot. Mag. 61: pl. 3301; Carnegie Inst. Wash. 269: pl. 10, f. 88. Plate xiv, figure 2, shows a leaf-bearing top of a plant grown at the New York Botanical Garden. Series 12. MIQUELIANAE. Bushy plants, with elongated cylindric bluish joints; tubercles large, elevated; leaves minute, early deciduous. ‘The series consists of but one species, confined to the deserts of northern Chile. 45. Opuntia miquelii Monville, Hort. Univ. 1: 218. 1840.* Opuntia pulverulenta Pfeiffer, Allg. Gartenz. 8: 407. 1840. Opuntia pulverulenta miquelit Salm-Dyck, Cact. Hort. Dyck. 1844. 49. 1845. Opuntia geissei Philippi, Anal. Univ. Chile 85: 492. 1894. Opuntia rosiflora Schumann, Gesamtb. Kakteen 686. 18098. Often growing in colonies 2 to 5 meters broad; stems cylindric, much branched, usually less than 1 meter high, but occasionally 1.5 meters high, with numerous lateral branches; branches rather short, usually only 8 to 20 cm. long, thick (5 to 6 cm. in diameter); old branches bluish green, with low tubercles sometimes 2 cm. long; young joints bright green, with high tubercles flattened laterally ; spines tardily developing, but formidable on old branches, very unequal, in clusters of 10 or more, the longest ones nearly 10 cm. long, whitish in age; glochids numerous, brownish, caducous; leaves minute, 2 to 3 mm. long; areoles circular, when young filled with white wool, in age somewhat ele- vated on the areoles; flowers rather variable in length, 4 to 8 cm. long including the ovary, rose- colored to nearly white; petals broad, apiculate, 2 to 2.5 cm. long; filaments rose-colored; ovary strongly tuberculate; areoles filled with numerous brown glochids and subtended by minute leaves; style white; stigma-lobes green; fruit ovoid to oblong in outline, nearly white; umbilicus truncate; seeds small, 4 mm. broad. Type locality: In South America, but no definite locality. Distribution: Province of Atacama, Chile. Opuntia miquelii and O. pulverulenta have long been considered identical. We have not seen the types of either, but are following such authorities as Salm-Dyck (in 1850), Labouret (1853), and Riimpler (1885) in uniting them. They seem to have been pub- lished in the same year. Opuntia geissei, according to a statement made to Dr. Rose by Juan Séhrens, of San- tiago, is the same as O. miquelii, and this the former was able to verify by later herbarium and field studies. Opuntia rosiflora Schumann was based on Philippi’s unpublished name O. rosea; while OQ. rosea was made by Philippi the type of O. geisset. ‘This is clearly shown by Philippi’s herbarium, where he has erased the name O. rosea and substituted O. geissei. Dr. Rose also obtained from William Geisse a part of Philippi’s original specimen, which came, as the label states, from near Bandurrias, in the valley of Carrizal, in the Province of Atacama. Later on, while making field observations in Atacama, Dr. Rose found this species very com- mon from north of Castillo to Vallenar. This is in the general region of O. geissei (O. rosea and O. rosiflora) and in the river valley of the Huasco. Huasco, the type locality of O. miquelti, is 25 miles lower down this valley, and we have no hesitancy in uniting them all. Although this species is not uncommon in cultivation, it has rarely been seen in flower, and we believe that the fruit has not heretofore been described. *Schumann states that this book was Published in 1839. BRITTON AND ROSE M. E. Eaton del. 1. Flowering branch of Opuntia burrageana. 3, 4. Joints of Opuntia stanlyi. 2. Opuntia cvlindrica. 5. Flowering joint of Opuntia macrorhiza. (All natural size.) OPUNTIA. 79 Dr. Rose observed a single plant infested by Loranthus aphyllus, the parasite which is so abundant on Cereus chiloensts. Opuntia heteromorpha Philippi (Anal. Mus. Nac. Chile 1891°: 28. 1891) we refer here on the authority of Schumann, but we have seen no specimens, the type specimen being missing from the Philippi herbarium in Santiago; it was collected at Chiquito, Tarapaca, Chile. Dr. Weber thought that Opuntia segethit belonged here, but we have referred it to O. subulata. Opuntia carrizalensis Philippi is only mentioned by Schumann (Gesamtb. Kakteen Nachtr. 152. 1903). It is doubtless to be referred here. Plate xvi, figure 1, is from a plant collected by Dr. Rose at Vallenar, Chile, in 1914. Series 13. CLAVATAE. Here we include nine prostrate or spreading, low species, natives of the southwestern United " States and Mexico, characterized by clavate joints and by sheathless spines, although rudimentary sheaths have been observed on young spines in some of the species; they appear to form a transition between the subgenus Cylindropuntiaand the South American subgenus Tephrocactus, from which they differ essentially in having clavate joints. Key TO SPECIES. Spines flattened. Stems very stout. Stems hardly clavate; ovary very prickly... 2.2... 6.26605 teens Stems strictly clavate; ovary only slightly prickly.... 0.0... 660 eee ees Stems more slender and weak. Spines brown, slender, long (4 to 6 cm. long).... 6.5.5.6... eee eee een 48. Spines stout, white, when old very flat. Bristles on ovary and fruit white... 0.000066 00. nes Bristles on ovary and fruit brown......2 2.2... 66 e eee ees Spines terete, elongated, and flexible, or the central ones somewhat flattened. Flowers pinkish or purple. st. O. pulchella Bristles on ovary numerous, brown........--- 2200-55220 e errr 51. ull 52. O. vilis 46. O. invicta 47. O. stanlyt ~ . schottit 49. O. clavata 50. O. parishit Bristles on ovary few, white.........0 0.055. 05ce eee eee nee Flowers yellow. ) bulbispi Spines comparatively short, swollen at base... 0.66... 5020 53. O. bulbispina Spines long and flexible, not swollen at base... .. 6-6-6665 54. O. grahamii 46. Opuntia invicta Brandegee, Proc. Calif. Acad. II. 2: 163. 1889. Plants growing in large clusters 2 meters in diameter and 2 to 5 dm. high, with many ascending or spreading branches; joints obovoid to clavate, dark green, 8 to 10 cm. long, strongly tuberculate; tubercles large, flattened laterally, 3 to 4 cm. long; areoles large, 1 to 1.5 cm. in diameter; leaves linear, 8 to 14 mm. long, reddish, curved, acute, deciduous; spines very formidable, when young reddish or purple with carmine-red bases, chestnut-brown at tips and grayish between, but in age dull in color; radial spines 6 to 10; central spines 10 to 12, much stouter than the radials, strongly flattened; wool white; glochids few, white, 2 to 4 mm. long; flowers yellow, 5 cm. in diameter; sepals ovate, acuminate; ovary 2 cm. in diameter, almost hidden by the numerous reddish, acicular spines; seeds yellowish, 2 mm. broad. Type locality: About San Juanico, Lower California. — Distribution: Central Lower California, at low elevations. . . Mr. Brandegee has called attention to the strong resemblance in habit of this species to some of the species of Echinocereus, and Dr. Rose states that when he first saw it he supposed it to be some strange Echinocereus. It grows in great tufted masses and does not suggest in the remotest degree any of our North American opuntias. The Species clearly belongs to Engelmann’s series Clavatae, where it was placed by Schumann, ¥ O associated it with O. cereiformis, but it is undoubtedly much nearer to O. stanly. So ar as we know, the plant has never been in the trade; it does not succeed well in biaaiie Considerable living material was brought back by the Albatross in 1911, most of which was sent to the New York Botanical Garden; but some of the plants were sent to collections at St. Louis, Washington, and Los Angeles. Illustration: Cact. Journ. 3: February. 80 THE CACTACEAE. Plate xvi, figure 2, represents a plant collected by Dr. Rose at San Francisquito, Lower California, in 1g1I. 47. Opuntia stanlyi Engelmann in Emory, Mil. Reconn. 158. 1848. Opuntia emoryi Engelmann, Proc. Amer. Acad. 3: 303. 1856. Opuntia kunzei Rose, Smiths. Misc. Coll. 50: 505. 1908. Stems low, usually less than 3 dm. high, much branched, creeping, forming broad, impenetrable masses 2 to 3 meters in diameter; joints 10 to 15 cm. long, clavate, more or less curved, strongly tuberculate; tubercles 3 to 4 cm. long, flattened laterally, 4 to 6 cm. apart; spines numerous, stout, elongated, somewhat roughened, reddish brown, the larger ones strongly flattened, 3.5 to 6 cm. long; flowers yellow, 5 to 6 cm. broad; fruit ovate, clavate at base, yellow, 5 to 6 cm. long, very spiny, with a depressed umbilicus; seeds flattened, 4.5 to 6.5 mm. in diameter. Type locality: On the del Norte and Gila, New Mexico. Distribution: Southwestern New Mexico to eastern Arizona and adjacent Mexico. O. stanlyi was first found October 22, 1846, by W. H. Emory on his first trip across the continent; he reported the plant as abundant on the Del Norte and Gila. There has been much speculation as to what this species is, for no specimens were preserved. Dr. George Engelmann, who named the species, based it upon a sketch made by the artist of the expedition, Mr. J. M. Stanly. By a reference to Emory’s itinerary we find that on October 22, 1846, he was in southwestern New Mexico. In 1908 Dr. Rose visited this region where he collected the various species of cacti to be found there. The only plant which we know from that part of New Mexico which could represent O. stanlyi is Opuntia emoryt; this was the conclusion reached by Wooton and Standley, who, in their Flora of New Mexico, have restored the name O. stanlyt. We have referred Opuntia kunzet here because recent specimens sent in by Dr. Kunze have taken on a phase very much like the true O. stanlyi. There isa possibility that O. kunzet should be maintained, for we are not altogether convinced that certain material we have seen should be merged into O. stanlyi. To clear up this point, it is hoped that someone will collect and preserve a full series of specimens showing flowers, fruits, and seeds. Illustrations: Emory, Mil. Reconn. App. 2. f. 9; Amer. Garden 11: 531?; Cact. Journ. 1: 154; Cact. Mex. Bound. pl. 70, 71, these last three as Opuntia emoryi; Hornaday, Camp- fires on Desert and Lava opp. p. 116, this as Opuntia kunzet. Plate xiv, figure 3, represents a plant collected by Dr. R. E. Kunze near Gunsight Mountains, Arizona, in 1912; figure 4 shows a leaf-bearing joint of the same plant. 48. Opuntia schottii Engelmann, Proc. Amer. Acad. 3: 304. 1856. Prostrate, rooting from the areoles, forming dense clusters sometimes 2 or 3 meters in diameter ; joints clavate, curved, ascending, easily breaking off, 6 to 7 cm. long, 2 cm. in diameter at thickest part, strongly tuberculate; leaves subulate, bronze-colored, 6 to 8 mm. long, acuminate; areoles I to 1.5 cm. apart; spines white and sheathed when young, soon brown, the larger ones sometimes as many as 12, very slender, sometimes 6 cm. long, somewhat flattened; wool white when young, turning brown; glochids white when young, turning brown, 4 mm. long or less; flowers yellow, 4 cm. long including ovary; sepals narrow, acuminate; petals acuminate; fruit yellow, narrowly oblong in out- line, a little narrowed at base, 4 cm. long, closely set with areoles bearing numerous short spines, bristles, and white wool, the umbilicus depressed; seeds yellow, flattened, 4 mm. in diameter, notched at base. Type locality: Arid soil near the mouth of the San Pedro and Pecos, western Texas. Distribution: Southern and western Texas and northern Mexico. Opuntia schottit greggii Engelmann (Cact. Mex. Bound. 68. pl. 73, f. 4. 1859), which came from near San Luis Potosi, Mexico, where it was collected by Dr. J. Gregg, in Decem- ber 1848, is much out of the range of the normal form and probably belongs elsewhere; but no specimens have been examined except the type, whichis fragmentary. Engelmann at first considered it a distinct species. Illustration: Cact. Mex. Bound. pl. 73, f. 1 to 3. Figure 92 represents joints of a plant collected by Dr. Rose at Langtry, Texas, in 1908. BRITTON AND ROSE M, E. Eaton del. 1; an Parts of joints of Opuntia exaltata. 3. 4. Upper part of joint of Opuntia t Upper part of joint of Opuntia macrar thra. ortispina. (AIl natural size, ) — 7/7 OPUNTIA. 81 49. Opuntia clavata Engelmann in Wislizenus, Mem. Tour North. Mex. 95. 1848. Plants low, not over 1.5 dm. high, much branched at base, spreading, forming large patches sometimes 2 meters in diameter; joints short, 3 to 7 cm. long, turgid, ascending, clavate; areoles close together; leaves subulate, 4 to 5 mm. long; spines pale, somewhat roughened, the radial ones 6 to 12, slender and acicular, 4 to 16 mm. long; central spines 4 to 7, much longer than the radials, more or less flattened, the largest one dagger-like; glochids numerous, yellowish, 3 to 5 mm. long; flowers yellow, 3.5 to 4 cm. long; fruit 4 to 5 cm. long, with numerous areoles filled with yellow, radiat- ing glochids; seeds white, 5 mm. broad. Type locality: Albuquerque, New Mexico. Distribution: New Mexico, chiefly in the central part of the State. This is one of the most characteristic species of the genus and has no near relative except O. parish, of the deserts of California and Nevada. It is a great pest to grazing stock. Illustrations: Bull. Agr. Exper. Station N. Mex. 78: pl.[1, 2], Pac. R. Rep. 4: pl. 22, f. 1 to 3; pl. 24, f. 6. Figure 93 represents joints of a plant collected by W. T. H. Long at Albuquerque, New Mexico, in 1915. Fic. 92.—Opuntia schottii. Xo0.75. Fic. 93.—Opuntia clavata. 0.75. 50. Opuntia parishii Orcutt, West Amer. Sci. 10: 81. 1896. Stems low, creeping, rooting along the under surface and forming dense, broad clusters; terminal joints short, clavate, ascending but almost hidden under the dense armament; tubercles prominent but short, 5 to 7 mm. long; spines at first reddish but soon grayish and finally nearly white; radial spines numerous, slender; central spines about 4, strongly angled and more or less flattened, 2 to 4 cm. long; glochids numerous; flowers not known; fruit 5 cm. long, the numerous large areoles bearing many long yellow glochids and short spines forming a radiating band about the margin; seeds dark, 4 mm. broad. Type locality: Mohave Desert. Distribution: Southern California and Nevada. — The species here described is the Opuntia parryi as described by Engelmann in 1856, although he then suspected it was different from that species. It has been renamed Opuntia parishii by Orcutt, who wrote as follows: resting plant of the Mohave desert region, hitherto called ll described. The Messrs. Parish have hardly earned this . : : : i leasure in dedicating light honor in many laborious trips through these desert regions, and I take ple ; this species to them: ; Opuntia parryi (type from San Felipe), along with bernarding and echinocar pa, and a bewildering host of nameless forms, I unhesitatingly class under serpentina Illustrations: Cact. Journ. 1: 132; N. Amer. Fauna 7: pl. 10; Pac. R. Rep. 4: pl. 22, f. 4 to 7; pl. 24, f. 7, all as Opuntia parryt. Figure 94 represents joints of a plant collecte ‘““We propose this name for that inte O. parryi, and under which it has been we d by S. B. Parish in southern California. 82 THE CACTACEAE. 51. Opuntia pulchella Engelmann, Trans. St. Louis Acad. 2: 201. 1863. Low, ro to 20 cm. high, densely branched, sometimes forming compact heads 6 dm. in diameter ;. main stem more or less definite, covered with areoles bearing yellow glochids 10 to 12 mm. long; lateral joints 5 to 6 cm. long, narrowly clavate, strongly tuberculate, purplish; areoles 6 to 8 mm. apart, 2 to 3 mm. broad; spines 10 to 16, slender, reddish, the longer ones 5 to 6 cm. long, somewhat ~ flattened: flower 5 cm. long, when open, fully as broad; petals purple, 3 cm. long; ovary 2 cm. long, bearing numerous areoles filled with white wool and purple glochids 10 to 12 mm. long; fruit about 2.5 cm. long; seeds (according to Coulter) thick and round, 4 mm. in diameter, with broad flat com- missure. Type locality: Sandy deserts on Walker River, Nevada. Distribution: Nevada and Arizona. The plant was first collected by Henry Engelmann in 1859, and brought to his brother, Dr. George Engelmann. The species does not succeed well in cultivation under glass. Illustration: Simpson’s Rep. pl. 3. Figure 95 is from an herbarium specimen collected by Thomas H. Means at Fallon, Churchill County, Nevada, in 1909. \ \ St ae ae SA ZINUERZ\ at SY \ FI PYLE Aix’¢ Lor Fg Ve ~~ VI ' FAS Is QA ~—7 a Ke | : 3 — SS WH SSQY"> oS LBS a ee a BS i a SS ™ —— . ZS E— > Pat Oh Ne S > My So oa Fic. 94.—Opuntia parishii. X0.66. Fic. 95.—Opuntia pulchella. 0.66. 52. Opuntia vilis Rose, Contr. U. S. Nat. Herb. 12: 293. 1909. Low, creeping, often forming mats several meters in diameter and only ro to 15 cm. high; joints prostrate, becoming erect or ascending, the ultimate vertical ones clavate, 5 cm. long, the others 2 to 4 cm. long, very turgid, pale green, with low tubercles; leaves terete, 2 to 3 mm. long, acute, red; young areoles bearing white wool; radial spines upward of 12, the number increasing with age by the addition of very small whitish ones; central spines on prostrate joints 4, reddish, white-tipped, 1 to 4 cm. long, terete, slightly scabrous, with a sheath 5 mm. long, those of clavate joints white, reddish on the upper surface at the base, and along the whole of the lower surface flattened; flowers 4 cm. long; petals brilliant purplish, 2 cm. long; filaments bright yellow with green bases; style white; stigma-lobes yellow; fruit pale green, blackening in drying, 2 to 2.5 cm. in diameter, 2.5 to 3 cm. long, tuberculate, especially about the margin of the umbilicus, spiny, fluted above, somewhat dry, with large white seeds. Type locality: Foot-slopes and plains of Zacatecas, Mexico. Distribution: State of Zacatecas, Mexico. Illustrations: Contr. U. S. Nat. Herb. 12: pl. 27; f. 36. Figure 96 is from a photograph of the type plant taken by F. E. Lloyd in Zacatecas, Mexico, in 1907. OPUNTIA. 83 Fic. 96.—Opuntia vilis. = 53. Opuntia bulbispina Engelmann, Proc. Amer. Acad. 3: 304. 1856. Stems low, forming wide-spreading clumps 6 to 12 dm. broad; joints ovoid in outline, 2 to 2.5 cm. long by 10 to 12 mm. in diameter; tubercles prominent, 6 to 8 mm. long; radial spines 8 to 12, acicular, 3 to 6 mm. long; central spines 4, much stouter than the radials, 8 to 12 mm. long, bulbose at base; flower and fruit not described in original description and as yet unknown. Type locality: Near Perros Bravos, north of Sal- tillo, Mexico. Distribution: Coahuila and probably into Durango, Mexico. | The type of this species was collected by Josiah . Gregg in 1848 and it has not with certainty been found since; it has been reported from one or two localities, but doubtless erroneously. At one time we supposed certain plants collected by Dr. Palmer in Chihuahua were to be thus referred. It is possible that specimens collected by Dr. Chaffey near Lerdo, Durango, may be referred here, as they have the short joints of this species, but the central spines are much longer, often reaching 2.5 to 3.5 cm.long. The type is deposited in the Engelmann Herbarium at St. Louis, and although the material is poor, it may yet serve to clear up this species definitely. As stated by Coulter, this species has been re- garded as the same as O. tunicata, a plant to which it is very remotely related. Illustration: Cact. Mex. Bound. pl. 73, f. 5, 6. Figure 97 is copied from the illustration above cited. \ 7 54. Opuntia grahamii Engelmann, Proc. Amer. Acad. 3: 304. 1856. Roots at first thick and fleshy, becoming woody, 2 cm. thick or more; plant low, much Dranched, spreading, forming low mounds often half buried in the sand, sometimes giving off roots at t Kare oles; terminal joints erect, clavate, bright green, 3 to 5 cm. long, with large Oolong tite. eaves thick, bronze-colored, ovate, acute, 3 to 4 mm. long; areoles about 3 mm. broad; w ols " spines 8 to 15, slender, slightly scabrous, terete or some of the larger ones slightly oe ea re or less. young, soon reddish, the longest 3.5 to 6 cm. long; glochids numerous, slender, 4 mm. ‘ong SS, Fic. 97.—Opuntia bulbispina. 84 THE CACTACEAE. white, turning brown, persistent on the old stems; flowers yellow, 5 cm. broad; sepals ovate, acute, about 5 mm. long; fruit oblong to ovoid, 3 to 4.5 cm. long, its numerous areoles bearing white glochids and some slender spines; seeds beakless, 5 to 5.5 mm. In diameter, the commissure indistinct, linear. Type locality: Near El Paso, Texas. Distribution: Western Texas, New Mexico, and adjacent parts of Mexico. This species was named for James Duncan Graham, Colonel, Corps of Engineers, United States Army, who died December 28, 1865, at Boston, Massachusetts. Colonel Graham was for a time chief ‘of the scientific corps of the United States and Mexican Boundary Commission, and caused the specimens of this plant to be transmitted to Dr. George Engelmann. The plant succeeds rather well in cultivation under glass. Illustrations: Cact. Mex. Bound. pl. 72; Schumann, Gesamtb. Kakteen f. 102. Figure 98 represents joints of a plant collected by Dr. Rose on hills near Sierra Blanca, Texas, in 1913. Fic. 98.—Opuntia grahamii. Xo0.75. Subgenus 2. TEPHROCACTUS. Includes all the South American species of Opuntia which have short, oblong, or globular joints. It is hardly to be distinguished from the North American series Clavatae. Four series are recog- nized. The plants are confined to Peru, Chile, Bolivia, and Argentina. (See key to series, p. 44.) Series 1. WEBERIANAE. Plants low, forming dense clumps; joints subcylindric, strongly tuberculate and bearing numer- ous spines. ‘This series suggests Platyopuntia, while the other series show closer relationship with the Cylindropuntia. Only one species known, inhabiting the dry part of northern Argentina. 55. Opuntia weberi Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 509. 1905. Densely cespitose, forming clumps 2 to 3 dm. in diameter and 10 to 18 cm. high; joints yellowish green, erect, cylindric, strongly tuberculate, 2 to 6 cm. long, 1.5 to 2 cm. in diameter, densely spiny; Fic. 99.—Opuntia weberi as it grows wild. OPUNTIA. 85 leaves described as wanting; tubercles spirally arranged, obtuse, somewhat 4-angled, 5 to6 mm. broad; areoles somewhat depressed; spines 5 to 7, brown, 3 to 5 cm. long, flexuous, the upper ones erect; flowers borne near the top of the plant, small, solitary; ovary somewhat woolly below and with short spines above; flower rotate, yellow; fruit dry, white, 10 mm. in diameter; seeds somewhat contorted, bony, glabrous. Type locality: In Sierra Pie de Palo, Province of San Juan, Argentina. Distribution: Mountains of Provinces of San Juan and Salta, Argentina. This description, though largely drawn from Dr. Spegazzini’s full account of this species, has been amplified from examination made of the type. Dr. Spegazzini refers it \ ss mas We Fic. 100.—Opuntia weberi. Natural size. to the subgenus Tephrocactus, and we have followed him in this; but it differs widely from any other known species of that group and its true affinity may be elsewhere. If the plant is leafless, as Dr. Spegazzini’s description implies, this is a most interesting exception to the character of Opuntia. . . ; Figure 99 is from a photograph of the plant at Molinos, Argentina; figure 100 is from a photograph of the type specimen in the collection of Dr. Spegazzini, to whom we are indebted for both of these illustrations. 86 THE CACTACEAE. Series 2. FLOCCOSAE. Low plants, forming dense clumps or mounds; joints short, thick, and fleshy, usually covered with long, white, silky hairs. The two species are common in the high valleys of the Andes of Peru and Bolivia. KEY TO SPECIES. Spines yellow, stout... 0.00.06 0. trees 56. O. floccosa Spines white, acicular.......... 0... nnn er rene tenes 57. O. lagopus 56. Opuntia floccosa Salm-Dyck, Allg. Gartenz. 13: 388. 1845. Opuntia senilis Roezl in Morren, Belg. Hort. 24: 39. 1874. Opuntia floccosa denudata Weber, Dict. Hort. Bois 897. 1898. Opuntia hempeliana Schumann, Gesamtb. Kakteen 690. 1898. Plant growing in clumps or low mounds sometimes 1 to 2 meters in diameter, with hundreds of short, erect branches; joints oblong, 5 to 10 cm. long, usually hidden under a mass of long white hairs coming from the areoles; spines usually one from an areole, sometimes as many as three, yellow, 1 to 3 cm. long; leaves minute, green or pinkish; tubercles somewhat elevated, elongated; flowers, small, 3 cm. long, yellow; fruit globular, 3 cm. in diameter: seeds 4 mm. in diameter, with very nar- row margins. Fic. 101.—Opuntia floccosa. Type locality: Said to be from vicinity of Lima, Peru, but doubtless only from the high mountains east of Lima. Distribution: High mountain valleys and hills of the Andes from central Peru to central Bolivia. O. floccosa is one of the most unusual and striking species of all the opuntias. One who is familiar only with the opuntias of North America would not suspect that it belongs to the genus. It does not grow on the hot mesas in the low country, as one would expect, but in the high, cold valleys and hills near the top of the Andes. The following paragraph, taken from John Ball’s notes, is interesting in this connection: Reserving some remarks on the botany of this excursion, there is yet to be mentioned here one plant of the upper region so singular that it must attract the notice of every traveler. As we ascended from Casapalta we noticed patches of white, which from a distance looked like snow. Seen nearer OPUNTIA. 87 at hand, they had the appearance of large, rounded, flattened cushions, some five or six feet in diam- eter, and a foot high, covered with dense masses of floss silk that glistened with a silvery lustre. The unwary stranger who should be tempted to use one of these for a seat would suffer from the experi- ment. ‘The plant is of the cactus family, and the silky covering conceals a host of long, slender, needle-like spines, that penetrate the flesh, easily break, and are most difficult to extract. Unfor- tunately, the living specimen which I sent to Kew did not survive the journey. Dr. Rose found the plant very abundant in the Andes from 3,600 to 4,260 meters altitude, while others have reported it as high as 4,570 meters altitude. It is very common, forming everywhere great, conspicuous, usually white mounds. Dr. Rose also found it quite common between Cuzco and Juliaca, in southwestern Peru. _ Mr. O. F. Cook, in the Journal of Heredity (8: 113. 1917), who has named this plant the polar bear cactus, wrote of it as follows: Many exposed slopes on the bleak plateaus of the high Andes are dotted with clumps of pure white cacti that look from a distance like small masses of snow. On closer view, the shaggy white hair of these cacti make them appear like small sheep or poodle-dogs, or like reduced caricatures of the denizens of the arctic regions. We are so accustomed to think of cacti primarily as desert plants, peculiarly adapted to hot, dry deserts, that they seem distinctly out of place on the cold plateaus of the high Andes of southern Peru. While most of the plants are covered with long white hairs, plants without hairs are not uncommon. ‘These naked plants, which are characteristic of the whole clump or colony, appear at first sight very unlike the other forms, but they grow in the same region and have the same kind of flowers and fruits. In cultivated plants few hairs are developed. The variety denudata Weber seems to be only one of these naked forms. Opuntia involuta Otto (Forster, Handb. Cact. 505. 1846) was not published, but was given as a synonym of this species. It was used the year before (Salm-Dyck, Allg. Gar- tenz. 13: 388. 1845) as a synonym of O. vestzia. Illustrations: Engler and Drude, Veg. Erde 12: pl. 14; Monatsschr. Kakteenk. 11: 41, 44, these last two as Opuntia hempeliana; Journ. Heredity 8: f. 3 to 8. . Plate x11, figure 2, is from a photograph taken by Mr. O. F. Cook in the high moun- tains of eastern Peru. Figure ror is from a photograph of a fragment of the plant col- lected by Dr. Rose in 1914, at Araranca, Peru. 57. Opuntia lagopus Schumann, Gesamtb. Kakteen Nachtr. 151. 1903. Plants cespitose, growing in compact mounds; joints stout, cylindric, 10 cm. long, 3 to 3.5 cm. in diameter, densely covered with long white hairs; leaves minute, hidden under the wool, 7 mm. long; spines solitary, white, 2 cm. long, slender; glochids white, bristle-like; flowers probably red; fruit not known. Type locality: Mountains of Bolivia above Arequipa, Peru. _ Distribution: On the plains of the high Andes of Peru and Bolivia (altitude 4,000 meters). This species is related to O. floccosa, with which it often grows, but it takes on a very different habit, growing in very dense, peculiar rounded mounds much higher than those formed by O. floccosa. , Illustration: Engler and Drude, Veg. Erde 12: pl. 14. Figure 102 is from a photograph by H. L. Tucker, near Laxsa, Peru, in I9IT. Series 3. GLOMERATAE. nts, the spines, or some of them, modified into blong joi . Plants low, composed of globose or obiong J confined to western Argentina. flat papery processes. We recognize two species, Kry TO SPECIES. Central spines papery; radial spines subulate .......-+--+-200scorrns Spines, when present, all developed into long papery processes..-.-------°> 58. O. australis 59. O. glomerata 88 THE CACTACEAE. Fic. 102.—Opuntia lagopus, growing in a mound. 58. Opuntia australis Weber, Dict. Hort. Bois 896. 1898. Pterocactus valentinii Spegazzini, Anal. Soc. Cient. Argentina 48:51. 1899. Plants often with large roots, these 5 to8 cm. long by 2 to 3 cm. in diameter and larger than the parts above ground; joints described as cucumber-shaped, usually 6 to 8 cm. long by 1 to 2 cm.in diameter, but apparently often much smaller, tuberculate; radial spines 1o to 15, spreading, white, short, 3 to 4 cm. long; central spines 1 or 2, much longer than the radials, 2 cm. long, erect, flattened, and somewhat papery; flowers yellow, 2 to 3 cm. broad; seeds said to be rugose. Type locality: Between Santa Cruz River and the Strait of Magellan, Argentina. Distribution: The southernmost parts of Argentina. We have recently examined three col- lections of this plant made by Carl Skotts- berg in the Territory of Santa Cruz, which in the main agree with Weber’s description. We have also seen Pterocactus valentinii, which is the same as Skottsberg’s plant. —— Fic. 103.—Opuntia australis. Showing large roots, joints, ° and flower. Natural size. Dr. Spegazzini records this species as being in Santa Cruz, Argentina; but as he regards the plant collected there by him as only a variety of O. darwinii, we are inclined to believe he must have collected something else. This species, which is found at the Strait of Magellan, extends farther south than any other cactus known to us. f- OPUNTIA. 89 Figure 103 is from a photograph of an herbarium specimen collected by Carl Skotts- berg in the Territory of Santa Cruz, Patagonia, in 1908. 59. Opuntia glomerata Haworth, Phil. Mag. 7: 111. 1830. Opuntia articulata Otto, Allg. Gartenz. 1: 116. 1833. Cereus articulatus Pfeiffer, Enum. Cact. 103. 1837. Cereus syringacanthus Pfeiffer, Enum. Cact. 103. 1837. Opuntia platyacantha Salm-Dyck in Pfeiffer, Allg. Gartenz. 5: 371. 18 37. Opuntia tuberosa spinosa Pfeiffer, Enum. Cact. 146. 1837. Opuntia andicola Pfeiffer, Enum. Cact. 145. 1837. Opuntia diademata Lemaire, Cact. Alig. Nov. 36. 1838. Opuntia turpinii Lemaire, Cact. Alig. Nov. 36. 1838. Opuntia andicola elongata Lemaire, Cact. Gen. Nov. Sp. 72. 1839. Opuntia andicola fulvispina Lemaire, Cact. Gen. Nov. Sp. 72. 18 39. Opuntia andicola major Lemaire, Cact. Gen. Nov. Sp. 72. 1839. Opuntia calva Lemaire, Cact. Gen. Nov. Sp. 73. 1839. Opuntia platyacantha gracilior Salm-Dyck, Cact. Hort. Dyck. 1844. 43. 1845. Opuntia platyacantha monvillei Salm-Dyck, Cact. Hort. Dyck. 1849. 71. 1850. Opuntia platyacantha deflexispina Salm-Dyck, Cact. Hort. Dyck. 1849. 245. 1850. Opuntia papyracantha Philippi, Gartenflora 21: 129. 1872. Opuntia syringacantha Schumann, Monatsschr. Kakteenk. 6: 156. 1896. Opuntia plumosa nivea Walton, Cact. Journ. 1: 105. 1898. Forming low, spreading clumps, the branches either erect or prostrate; joints globular, 3 to 6 cm. in diameter, often in cultivated specimens even smaller, dull grayish brown, hardly tuberculate except in drying; areoles large, bearing numerous long, brown glochids; spines often wanting, when present 1 to 3, long, weak, thin and papery, hardly pungent, either white or brownish, sometimes 10 cm. long; flowers light yellow, small; fruit globose, 1 to 1.5 cm. long, dry; seeds corky. Type locality: Brazil, according to Haworth, but erroneously. Distribution: Western Argentina. It has also been referred to Brazil and Chile, but surely not found in Brazil, and we should not expect it to inhabit Chile. The plant figured by Nicholson (Dict. Gard. 2: f. 755) as O. platyacantha hardly belongs here. O. glomerata, which is common on the dry hills about Mendoza, is very variable, especi- ally as to whether it is spine-bearing or not; while the spines—which are really not spines but thin ribbon-like processes—vary much as to their color, markings, and length. These variations are partly the cause of so many synonyms for the species. Dr. Rose, who visited the region in which this species grows, found wide variation in the size of the joints, as well as in the absence or presence of spines. Tephrocactus diadematus Lemaire (Cact. 88. 1868), JT. turpinii Lemaire (Cact. 88. 1868), ' an Opuntia polymorpha Pfeiffer (Enum. Cact. 103. 1837), and Opuntia turpinit poly- morpha Salm-Dyck (Cact. Hort. Dyck. 1849. 71. 1850) are usually given as synonyms of Opuntia diademata, but none of them was actually published. Opuntia polymorpha Pfeiffer was used by Pfeiffer as a synonym for Cereus articulatus Pfeiffer. Tephrocactus andicolus, T. calouus, and T. platyacanthus, all of Lemaire (Cact. 88. 1868), without descriptions, are referred here by inference. _ Spegazzini (Anal. Mus. Nac. Buenos Aires III. 4: 511. 1905) describes three varieties of this species under O. diademata, from Argentina, as follows: imermis, ogacantha, an polyacantha; while Weber (Dict. Hort. Bois 896. 1898) under the same name describes var. calva, but these all seem to be forms of this very variable species. Fic. 104.—Opuntia glomerata. Xo.5. go THE CACTACEAE. The following varietal names, under Opuntia glomerata var. albispina Forster (Handb. Cact. 472. 1846), var. flavispina Salm-Dyck (Cact. Hort. Dyck. 1844. 43. 1845), and var. minor Salm-Dyck (Cact. Hort. Dyck. 1849. 71. 1850), are mentioned in the places cited, but not described. Opuntia horizontalis Gillies (Pfeiffer, Enum. Cact. 145. 1837) was used as a synonym of Opuntia andicola, and should be referred here. Opuntia pelaguensis (Salm-Dyck, Cact. Hort. Dyck. 1849. 71. 1850) was published as a synonym of Opuntia platyacantha deflexispina. Opuntia andicola minor, an unpublished variety, is mentioned by name only in Monats- schrift fiir Kakteenkunde (10: 48. 1900). Illustrations: Cact. Journ. 1: 100, as Opuntia andicola: Engler and Prantl, Pflanz- enfam. 3°*: f. 56, K.; Gard. Chron. III. 34: f. 39; Monatsschr. Kakteenk. 13: 23, these three as Opuntia diademata. Cact. Journ. 1: February; Dict. Gard. Nicholson Suppl. f. 607; Forster, Handb. Cact. ed. 2. f. 125; Gard. Chron. III. 23: f. 129; 29:f. 63; Gartenflora 21: pl. 721, f. 2, all as Opuntia papyracantha; Cact. Journ. 1: 105, as Opuntia plumosa nivea. Figure 104 represents a plant collected by Dr. Rose at Mendoza, Argentina, in 1915. Opuntia schumannii Spegazzini (Anal. Mus. Nac. Buenos Aires III. 4: 511. 1905, not Berger, 1904) is a homonym, and we hesitate to giveit a new name until it is better known. ‘The type comes from Salta, Argentina, from a region where we already have a number of species of Tephrocactus. Spegazzini, who described it, says it is related to O.diademata, which is now referred to O. glomerata, but is very distinct. It is without spines and the flowers are unknown. Series 4. PENTLANDIANAE. Plants often growing in large mounds; joints globular to oblong; spines usually slender, acicular to subulate. Seventeen species are here recognized. KEY TO SPECIES. Spines very long and stout, up to 15 to 20 cm. long..... 00.0000... 00 0c cc cece eee ee eaees 60. O. aoracantha Spines slender, 10 cm. long or less. Spines appressed to the joints. Spines 12 to 20, flexuous; joints 7 cm. long............. Lecce eee eee neces 61. O. rauppiana Spines 6 or 7; joints 2 to 4cm. long........0.0000 000000 ccc cece cece eee anes 62. O. subterranea Spines straight, not appressed. Spines flat or semiterete. Spines 7 to ro cm. long...... 00. ccc ccc eee n eee seneneeeneeeaes 63. O. hickentt Spines 6 cm. long or less. Longer spines 1 to 3. Joints ellipsoid, 4 to 5 cm. thick......00 0000 ccc cence ees 64. O. darwinit Joints oblong, 1 cm. thick. .....0 00000 ccc cece te eeecunes 65. O. tarapacana Longer spines 4 or 5. SPINES Bray... ccc eee e eee e eee eeeneeees 66. O. atacamensis . Spines yellow... 0.0... cece nec e nee ee eect eeeetenres 67. O. russellit Spines terete. Spines white, at least when young. Joints tuberculate. 22... ccc cece ene e ee eeeauns 68. O. corrugata Joints not tuberculate. Joints C0) 0) C0) 5 cc 69. O. ovata ; Joints globose... 00... ee ccc e eee e ten ceneenbenes 70. O. sphaerica Spines yellow to brown or nearly black. Roots large and woody; spines nearly black........000 00000 cecece cece ee eee 71. O. skottsbergit Roots fibrous. Spines purple-black... 2.000 ccc cece cece eeceenees 72. O. nigrispina Spines yellow to brown. Plants forming large clumps. Fruit about 2.5 cm. long, nearly unarmed.....................000. 73. O. pentlandit Fruit 5 to 6 cm. long, copiously armed with long spines above........ 74. O. ignescens Plants isolated, not forming clumps. Old joints globose; spines acicular........0.. 00000 ccc cece ee eeceeee 75. O. campestris Joints all oblong; spines subulate...........0..0... 00000. c cece eeeee 76. O. ignota OPUNTIA. gI 60. Opuntia aoracantha Lemaire, Cact. Alig. Nov. 34. 1838. Cereus ovatus Pfeiffer, Enum. Cact. 102. 1837. Not Opuntia ovata Pfeiffer, 1. c. 144. 1837. Opuntia formidabilis Walton, Cact. Journ. 1: 105. 1898. Usually low, cespitose, forming clumps 2 to 5 dm. in diameter and sometimes 1 to 2 dm. high; branches grayish, either erect or prostrate, made up of 5 to 10, perhaps even more, globular joints; joints easily detached, freely rooting and starting new colonies, 5 to 8 cm. in diameter, strongly tuber- culate especially when young, the lower part spineless, the upper areoles large, spine-bearing; spines brown or blackish, 1 to 7, the longer ones 13 cm. long, straight, a little flattened, roughish to the touch; flowers white; fruit short-oblong, 3 cm. long, red, weakly tuberculate, bearing numerous areoles, usually naked but sometimes bearing a few short spines near the top, becoming dry; umbili- cus of fruit broad and depressed; seeds white, flattened, 4 to 5 mm. broad, the margins thick and corky. Fic. 105.—Opuntia aoracantha. Xo0.66. Type locality: Not cited, but doubtless from Mendoza. . Distribution: Western provinces of Argentina, from Mendoza to Jujuy. rep) ns Opuntia gilliesii Pfeiffer (Enum. Cact. 102. 1837, as synonym) and ephrocac ws aoracanthus Lemaire (Cact. 89. 1868) are usually given as synonyms of this species, u they were not described in the places pees cited, and as here given. Opuntia acra- cantha Walpers (Repert. Bot. 2: 354. 1843) is a typograp ical error. O. sareanths although described nearly 80 years ago, 1s practically unknown in col- lections and has been very poorly described. The fruit has heretoure been un mown. Dr. Rose found it in 1915 in great abundance growing on dry, rocky hills west 0 ; 92 THE CACTACEAE. although in but one locality. A bountiful supply of living material was sent home, several photographs were taken, and fruit and seeds obtained. Opuntia tuberiformis Philippi (Anal. Mus. Nac. Chile 18917: 28. 1891), referred here by Schumann, doubtless belongs elsewhere. It may possibly belong to some Platyopuntia, for it is described as having ovate joints only 5 mm. thick. It comes from the foot of the Andes in the Province of Tarapaca, Chile. Illustrations: Gard. Chron. III. 34: £. 40; Monatsschr. Kakteenk. 12: 172; Cact. Journ. 1: 105, the last as O. formidabilis. Figure 105 represents a joint of a plant collected by Dr. Rose at Mendoza, Argentina, in I9QI5. 61. Opuntia rauppiana Schumann, Monatsschr. Kakteenk.9: 118. 1899. Joints ellipsoid, rounded at each end, somewhat tubercu- late, dark green or becoming grayish green, 7 cm. long by 4 cm. in greatest diameter; glochids yellow, 5 cm. long; spines 12 to 14, sometimes as many as 20, very weak, almost bristle-like, 2 cm. long, hardly pungent. Type locality: In the Andes. Distribution: Bolivia, according to Schumann. Little is known of the habit of this plant, as only one . joint is figured and this appears to be a sickly greenhouse specimen. It suggests some of the species which grow in Fic. 106.—Opuntia rauppiana. large clumps like the one figured as Opuntia grata by Fries. Illustrations: Monatsschr. Kakteenk. 9: 118; Schumann, Gesamtb. Kakteen Nachtr. f. 36 (same). Figure 106 is copied from the illustration above cited. 62. Opuntia subterranea R. E. Fries, Nov. Act. Soc. Sci. Upsal. IV. 11: 122. 1905. Almost buried in the sand, simple or few-branched from a thick root 7 to 12 cm. deep: joints terete, 2 to 4cm. long; tubercles low; spines 1 to 7, all radial, short, whitish, recurved, appressed Fic. 107.—Opuntia subterranea. Fic. 108.—Opuntia hickenii. Xo.6. OPUNTIA. 93 flowers lateral, brownish; ovary small, with a depressed umbilicus, its areoles bearing small glochids and a little wool; fruit 12 to 15 mm. long; seeds 3 mm. broad, irregular. Type locality: Near Moreno, Jujuy, Argentina. Distribution: Northern Argentina and adjacent Bolivia. This peculiar little plant, heretofore known only from the type collection, was obtained by Dr. Shafer on stony plains at Villaz6n, Bolivia, in February 1917, but was not in bloom. Illustration: Nov. Act. Soc. Sci. Upsal. IV. 1’: pl. 8, f. 4 to 8. Figure 107 is copied from the illustration above cited. 63. Opuntia hickenii sp. nov. Low, cespitose, forming clusters 1 meter in diameter; joints globular, 3 to 5 cm. in diameter, strongly tuberculate, the lower tubercles usually spineless; areoles rather large, circular; spines 2 to 5, flat and thin, narrow, weak, pungent, 5 to 12 cm. long, silvery-colored but nearly black in age; flowers yellow; fruit not known. Type in United States National Herbarium, No. 603229, from Puerto Madryn, Chubut, Argentina, collected by Cristébal M. Hicken. Common in Chubut and Rio Negro, southern Argentina, where it was collected several times by Dr. Hicken. Figure 108 represents the type specimen above cited. A photograph of a plant from San Juan, Argentina, communicated by Dr. Spegaz- zini, indicates another species of this relationship. 64. Opuntia darwinii Henslow, Mag. Zool. Bot. 1: 466. 1837. Low, perhaps not more than 2 to 4 cm. high, much branched at base from a more or less elon- gated woody root; joints normally few, nearly globular, about 3 cm. in diameter, or often nearly cylindric, frequently numerous and small and growing out from the main axis, then only 5 to 10mm. in diameter; areoles large, filled with wool, the lower ones spineless; spines 1 to 3, nearly erect, the longest one 3 to 3.5 cm. long, yellow or reddish yellow, decidedly flattened; flowers originally de- scribed as larger than the joints, but certainly often much smaller; petals yellow, broad, with a trun- cate or depressed top and usually with a mucronate tip; ovary, In specimens seen, only 2 cm. long, covered with large woolly areoles; styles described as stout, with 9 thick radiating stigma-lobes. Type locality: Port Desire, Patagonia, latitude 47° south. Distribution: Southern Argentina. This species seems to be common in that part of Patagonia known now as the Ter- ritory of Santa Cruz, Argentina. We have recently examined four separate collections made in this region, especially one from about Lake Buenos Aires and on the Fenix River by Carl Skottsberg, in 1907-1909. The plant is in cultivation in Europe and is offered for sale by cactus dealers. It was first collected by Charles Darwin, but only a single joint was taken, which was described and figured by Rev. J. S. Henslow. The illustration of the flowers seems too large, but otherwise represents fairly well the plant as we know it. The following interest- ing note is taken from Mr. Henslow’s article as it appeared in the Magazine of Zoology and Botany, volume 1, page 467: I have n is interesting Cactus after my friend C. Darwin, Esq., who has recently returned to Bralend, after a five years’ absence on board H. M. S. Beagle, whilst she was employed in surveying the southernmost parts of South America. The specimen figured was gathere in \ ¢ month of January, at Port Desire, lat. 47° S. in Patagonia. He recollects also to have seen ie same plant in flower as far south as Port St. Julian in lat. 49°S. Itisa small species growing c pose to the ground on arid gravelly plains, at no great distance from the sea. The flowers, a onc ay arrested his attention by the great irritability which their stamens manifested upon Ms inser ing a piece of straw into the tube, when they immediately collapsed round the pistil, and the segmen : ) the perianth soon after closed also. He had intended to procure fresh specimens on the oliow ing day, and returned to the ship with the one now figured, but unfortunately she sale imme iate y afterwards, and he was prevented from obtaining any more. The geographical position of this 94 THE CACTACEAE. species is beyond the limits hitherto assigned to any of the order, which are not recorded as growing much south of the tropic of Capricorn. ‘The climate is remarkably dry and clear, hot in summer, but with sharp frosts during the winter nights. He found Cacti both abundant and of a large size, a little farther to the north at Rio-Negro in latitude 41° 5. Illustration: Mag. Zool. Bot. 1: pl. 14, f. 1. Figure 109 is copied from a photograph of an herbarium specimen collected by Carl Skottsberg in Patagonia in 1908. 65. Opuntia tarapacana Philippi, Anal. Mus. Nac. Chile 18917: 27. 1891. Opuntia rahmeri Philippi, Anal. Mus. Nac. Chile 18917: 27. 1891. Low, cespitose plants; joints small, ovoid, about 2 cm. long by 1 cm. thick, bearing spines from white woolly areoles at tips; spines usually 3, straight, 12 to 15 mm. long, white with yellowish tips; flowers yellow; petals 21 mm. long; ovary elongated, 2 cm. long. Type locality: Calalaste, Chile. Distribution: Known only from type locality, although Schumann in his Keys refers this species to Bolivia. Although the type of this species is preserved in the Museum at Santiago, Chile, it is insufficient to enable us to give a very full description. It seems distinct from the other species of the group. Fic. 109.—O. darwinii. Xo.6. Fic. 110.—O. atacamensis. Xo.6. Fic. 111.—O. russellii. 0.6. 66. Opuntia atacamensis Philippi, Fl. Atac. 24. 1860. ? Pereskia glomerata Pfeiffer, Enum. Cact.179. 1837. Not Opuntia glomerata Haworth. 1830. Growing in large, dense clusters sometimes 6 dm. broad and 3 dm. high; joints ovoid, 2.5 cm. long by 2 cm. in diameter; areoles in 5 to 7 series, the lower ones with wool and very short spines, upper areoles each bearing 1 erect central spine 18 to 25 mm. long, yellow or reddish; radial spines 2 to 4, strongly appressed, 2 mm. long; flowers yellow. Type locality: Profetas, Chile; also Puquios, 23° 50’ south latitude: Distribution: On the high central deserts of northern Chile at an altitude of 2,700 to 3,300 meters. We have not seen the type of this species, and our reference of Pereskia glomerata here may not be correct. I llustration: Nov. Act. Soc. Sct. Upsal. IV. 1': pl. 1, as Opuntia grata. Figure 110 represents a plant obtained by Dr. Rose at the Botanical Garden, Santiago, Chile, in 1914. 67. Opuntia russellii sp. nov. Forming small, compact clumps 1 to 2 dm. in diameter; joints small, globular to obovoid, dull green to more or less purplish, 2 to 4 cm. long, very spiny near the top; leaves minute, acute, soon falling; prominent spines 3 to 6, yellow, 2 to 3 cm. long, slightly flattened; accessory spines 1 to OPUNTIA. 95 several, 1 cm. long or less; glochids at first inconspicuous, but in time very abundant, sometimes 2 cm. long, somewhat persistent; flowers not known; fruit globular, 2 to 2.5 cm. in diameter, spineless; seeds pale, 4 mm. broad. Collected by J. N. Rose and Paul G. Russell on the dry hills at Potrerillos, Mendoza, Argentina, September 2, 1915 (No. 21002). This is a common species in the foothills of the Andes, in the Province of Mendoza, where it forms low mounds along with other cacti. Figure 111 represents joints of the type specimen above cited. 68. Opuntia corrugata Salm-Dyck, Hort. Dyck. 360. 1834. Opuntia eburnea Lemaire, Cact. Alig. Nov. 35. 1838. Opuntia retrospinosa Lemaire, Cact. Aliq. Nov. 35. 1838. Opuntia parmentieri Pfeiffer, Allg. Gartenz. 6: 276. 1838. More or less cespitose; joints 3.5 cm. long, 8 to 12 mm. in diameter, orbicular to cylindric, often erect, attenuate at both ends, light green, the terminal one often flattened; glochids minute, yel- lowish; spines 6 to 8, acicular, 8 to 12 mm. long, white; flowers reddish; fruit red. Type locality: None given. Distribution: Northwestern Argentina, according to later writers. Lemaire (Cact. 88. 1868) uses the names Cactus corrugatus and C. eburneus, both of which Schumann refers here. So, Tephrocactus retrospinosus Lemaire (Cact. 88. 1868) is placed by Lemaire in his third section of Tephrocactus, but it is without description. It is doubtless the same as Opuntia retrospinosa Lemaire, which belongs here. ; Opuntia aulacothele Weber (Gosselin, Bull. Mus. Hist. Nat. Paris 10: 392. 1904), which was described without flowers or fruit, may be of this alliance. It comes from San Rafael, Argentina. ; . Opuntia cornigata, mentioned in Bailey’s Standard Cyclopedia of Horticulture (4: 2367. 1916), is a misspelling of this name. Opuntia corrugata monvillei Salm-Dyck (Cact. Hort. Dyck. 1849. 72. 1850) was not described. . Opuntia longispina Haworth (Phil. Mag. 7: 111. 1830), when first described, was Sup- posed to have come from Brazil; the Index Kewensis refers it to Chile; while Schumann treats it in a note under O. corrugata as an Argentine species. It may not be an Opuntia but a Mathuenia. 69. Opuntia ovata Pfeiffer, Enum. Cact. 144. 1837. Opuntia ovallei Remy in Gay, F1. Chilena 3:29. 1847. Opuntia grata Philippi, Linnaea 30: 211. 1859. Opuntia monticola Philippi, Linnaea 33:82. 1864. Low, branching, cespitose plants; joints yellowish green, some deep purple when young, subcylindric to ellipsoid, 3 cm. long; spines 5 tog, 4 to 10 mm. long, when young brown- ish, in age white; fruit ovoid; umbilicus curved outward. Type locality: Mendoza, Argentina. Distribution: Mountains of Argentina and Chile. voides Lemaire Opuntia ovoides Lemaire (Cact. Gen. Nov. 5p. 73. 1839) and Cactus ovotdes } ema (Cact. 88. 1868) are usually cited as synonyms for Opuntia ovata; they are unpublished names. This species forms low clumps, each branch con sisting of 2 to 5 joints. Dr. Rose pound it abundant in the Andes above Mendoza and it has also been reported from the C ilean side of the Andes. Colonies differ in armament. In cultivation some of the joints are elongated and club-shaped. } ta. Illustration: Schumann Gesamtb. Kakteen f. 105, as Opuntia gra . Figure 112 shows joints of the plant collected by Dr. Rose in 1915 at Potrerillos, Argentina. Fic. 112.—Opuntia ovata. X0.5. 96 THE CACTACEAE. 70. Opuntia sphaerica Forster, Hamb. Gartenz. 17: 167. 1861. Opuntia dimorpha Forster, Hamb. Gartenz. 17: 167. 1861. Opuntia leonina Haage and Schmidt in Regel and Schmidt, Gartenflora 30: 413. 1881. Opuntia leucophaea Philippi, Anal. Mus. Nac. Chile 18912: 27. 1891. Opuntia corotilla Schumann in Vaupel, Bot. Jahrb. Engler Beibl. 111: 28. 1913. Plants often erect, always low, usually few-branched, often forming large patches; joints usually globular, 12 to 40 cm. in diameter; areoles large, numerous, sometimes nearly hiding the surfaces of the joints with their short brown wool; spines variable as to number, sometimes few, sometimes numerous, brown at first, in age sometimes gray, 1 to 4 cm. long, usually stiff; flowers 4 cm. long, deep orange; petals obtuse; fruit globular, often very spiny; seed globular, white, 4 mm. in diameter, surrounded by a thin, broad band. Type locality: Near Arequipa, Peru. Distribution: Central Peru to central Chile. The three illustrations cited below were made from the same cultivated plant. They look very much like a poor specimen of Opuntia glomerata, and, if such it should prove, the name O. leonina should be re- ferred to the synonymy of that species. We have referred Opuntia di- morpha here with some hesitancy. This plant often passes for Opuntia ovata and, from herbarium specimens we have seen, it has been so identified by Rudolph Philippi. This species is very common in sandy places on hills, dry flats, and in mountain valleys, often cover- ing the ground to the exclusion of all other plants. The joints readily break loose and, falling to the ground, start new colonies. We found the species very common both above and below Arequipa, Peru, where it is called corotilla; in central Chile it grows at lower altitudes but in similar situations. In Chile it is called leon or leoncito, which is probably the origin of the name Opuntia leonina. Opuntia phyllacantha Haage and Schmidt (Regel and Schmidt, Gartenflora 30: 414. 1881), if it actually came from Chile, as stated, may belong here. ‘The joints are more elongated, although the habit is somewhat similar. The illustration is poor and has doubt- less been made from a greenhouse specimen. This name was given, with Salm-Dyck as authority, by Forster (Handb. Cact. 508. 1846), but without any description. Illustrations: Cact. Journ. 1: 100; Forster, Handb. Cact. ed. 2. f. 133; Gartenflora 30: 413, all as Opuntia leonina. Figure 113 is from a photograph of joints of the plant collected by Dr. Rose above Arequipa, Peru, in 1914. Fic. 113.—Opuntia sphaerica. 71. Opuntia skottsbergii sp. nov. Roots thick and fleshy, sometimes 10 cm. long, the plant doubtless more or less cespitose; joints, at least some of them, globular, 3 cm. in diameter, almost hidden by the numerous closely set spines; areoles close together, small, at times producing long tufts of white wool; spines about 10, black except the yellowish tips, 1 to 2 cm. long; glochids numerous, elongated; flowers, including the very cae OPUNTIA. 97 spiny ovary, about 6 cm. long; petals about 3 cm. long, drying reddish or reddish green; areoles of the ovary bearing 5 to 7 spines, which are brown or blackish below and with more or less yellowish tips; fruit not known. Collected near Lake Buenos Aires, Territory of Santa Cruz, Argentina, December 12, 1908, by Carl Skottsberg (No. 675); and again on the Rio Fenix, north of the locality above given, December 10, 1908 (No. 625, type). This species belongs to the subgenus Tephrocactus, but is not closely related to any of the described species. The flower resembles very much the one figured by Henslow as O. darwinit, and it is possible that he may have had some of this species in his O. dar- winit; the plant bodies, however, are so different that one could hardly confuse the two. Figure 114 is copied from a photograph of the type specimen above cited. 72. Opuntia nigrispina Schumann, Gesamtb. Kakteen 695. 1898. Opuntia purpurea R. E. Fries, Nov. Act. Soc. Sci. Upsal. IV. 1!: 123. 1905. Described as a shrub, 1 to 2 dm. high and much branched, the branches upright; joints dull green or reddish violet, 2 to 4 cm. long, 1 to 2 cm. in diameter, oblong-ellipsoid, terete, when young bearing decurrent, spirally arranged tubercles; areoles 2 to 3 mm. in diameter, bearing abundant Fic, 116.—Opuntia pentlandii. Xo.4. Fic. 114.—Opuntia skottsbergii. Fic. 115.—Opuntia nigrispina. Xo.8. . : ight, spreading, subterete, wool and glochids; spines 3 to 5 from upper areoles, 2.5 to 3 cm. long, straight, weak, purplish black ; flowers small, purple, 2.2 to 2.5 cm. long; petals spatulate, 1.5 cm. long, 6 mm. broad; stigma-lobes 5; ovary 1 cm. long, obovoid, nearly smooth. Type locality: On the puna of Humahuaca, Bolivia. Oe , 1 Distribution: Rare in stony mountains, altitude 3,500 meters, Jujuy, Argentina, an southern Bolivia. Figure 115 represents a fruiting joint collected by J. A. Shafer at La Quiaca, Argen- tina, February 2, 1917 (No. 79). 73. Opuntia pentlandii Salm-Dyck, Allg. Gartenz. 13: 387. 1845. I vis 2388. 1845. Opuntia boliviana Salm-Dyck, Allg. Gartenz. 13 388. 1 Opuntia pyrrhacantha Schumann, Gesamtb. Kakteen 694. 1898. Opuntia dactylifera Vaupel, Bot. Jahrb. Engler Beibl. 111: 29. ‘ an 1 the description.) Opuntia cucumiformis Griffiths, Bull. Torr. Club 43:524. 1916. o1 sc | rounded, compact mounds sometimes a meter broad with s obovoid to oblong-cylindric, plump, 2 to 10 cm. long, green or sometimes purplish, tuberculate; lochids, the upper ones sometimes also ly from the upper areoles, erect, 2 to 10, the longest one 7 cm. long; flowers Plant much branched, forming low, hundreds of short stubby branches; joints ob sometimes 4 dm. in diameter, more or less pointed, pale areoles small, circular, filled with short wool and yellow g having spines; spines sometimes wanting, when present most usually bright yellow, sometimes brownish becoming dull brown, 98 THE CACTACEAE. very variable in color and size, lemon-yellow to deep red, 2 to 3 cm. long, sometimes 5 cm. broad when fully expanded; petals obtuse; filaments short; style thick; stigma-lobes very short; ovary short with few areoles; areoles on ovary subtended by minute leaves, filled with short wool, the upper ones with bristle-like spines; fruit globular to short-oblong, 2 to 3 cm. long, dry ; seeds numerous, 4 to 5 mm. long. Type locality: In Bolivia. Distribution: Very common on the high pampas of southeastern Peru and Bolivia, and adjacent Argentina. Cactus pentlandii Lemaire (Cact. 88. 1868), name only, is sup- posed to apply to this species. This is one of the most characteristic plants of the high pampas of the Andean region, mostly growing at elevations of 12,000 feet or higher, forming low, broad, compact clumps, sometimes made up of a hundred plants or more. Illustrations: ?Dict.Gard. Nicholson 2: f.751; ?Férster, Handb. Cact. ed. 2. f. 124; ?W. Watson, Cact. Cult. f. 77, all as Opuntia boliviana; Monatsschr. Kakteenk. 24: 175, as Opuntia dactylifera. 3:4. 117—opuntia pent- Figure 116 represents a joint of the plant collected in landii. Xo.4. 1914 by Dr. Rose at Comanche, Bolivia; figure 117 shows a flowering joint collected by Dr. Rose in 1914, at Juliaca, Peru. 74. Opuntia ignescens Vaupel, Bot. Jahrb. Engler Beibl. 111: 30. 1913. Plants forming clumps 2 dm. high or less, with hundreds of erect or spreading joints; joints bluish green, 8 to 10 cm. long, very fleshy, naked below; upper areoles very spiny; spines 6 to 15 from each areole, nearly equal, 4 to 5 cm. long, erect, acicular, yellow; flowers very showy, deep red; ovary oblong, 3 to 4cm. long, naked below, but the upper areoles producing numerous spines 4 to 7 cm. long; fruit red, 7 cm. long, spiny and tuberculate above, terete below, with a deep umbilicus; seeds nearly globular, about 5 mm. in diameter. Type locality: Near Sumbay, southern Peru. Distribution: On the pampas of southern Peru and northern Chile, at altitude of 3,000 to 3,600 meters. Fic. 118.—Opuntia ignescens. X0.5- Fic. 119.—Opuntia ignescens forming large mounds. reser BRITTON AND ROSE PLATE XVI M. E. Eaton del. 1. Top of Opuntia miquelit. 2. Old and young joints of Opuntia invicta. 3. Upper part of joint of Opuntia ignescens. (All natural size.) OPUNTIA. 99 Plate xvi, figure 3, represents old and young joints of the plant collected above Ay- rampl, Peru, by Dr. Rose in 1914. Figure 118 shows a fruit from thesame plant; figure 119 is from a photograph taken by H. L. Tucker at Coropuna, Peru, in rg11. 75. Opuntia campestris sp. nov. Much branched, often forming low, dense masses, 3 to 6 dm. in diameter; terminal joints readily breaking off; joints globular or a little longer than thick, 3 to 5 cm. long, with numerous prominent areoles, the tubercles conspicuous when young; leaves minute, 1 to 1.5 mm. long, caducous; glochids conspicuous, numerous, yellow; spines usually wanting at the lower areoles, present above, very unequal, 5 to 10, acicular, the longest ones 3.5 cm. long; flowers rosy white to light yellow, 2 to 3 cm. long; ovary naked or spiny; fruit thicker than long, 2.5 cm. long, with deep umbilicus, often very spiny. Common just below railroad station at Z Pampa de Arrieros, Peru, where it was col- lected by Dr. Rose, August 23, 1914 (No. 18957). Figure 120 represents joints of the type specimen above cited. X0.8. Fic. 121.—Opuntia ignota. Xo.8. Fic. 120.—Opuntia campestris. 76. Opuntia ignota sp. nov. ing; joi less purplish ; Low, much branched, spreading; joints small, narrow, 2 to 3 cm. long, more or p ; leaves minute, often purplish: spines 2 to 7 from an areole, brownish, acicular, the longest ones 4 to 5 cm. long; glochids, when present, yellow; areoles large, full of grayish wool; flowers and fruit not seen. Collected by Dr. Rose on the hills below the railroad station at Pampa de Arrieros, Peru, August 23, 1914 (No. 18974). Plants grown in greenhouses are. This plant grows in the same region as O. campe Figure 121 shows joints of the type specimen above cited. Subgenus 3. PLATYOPUNTIA. Includes all the species with flattened joints; a few species have near'y aan joints; others have some of the joints terete. T wenty-eight series are recognized. ‘ species are most abundant in North America, but several series are found only in South America, while others have representatives in both Americas. (See Key to the Series, p. 45-) dark green and develop few spines or none. — stris, but is quite different from it. 100 THE CACTACEAE. Series 1. PUMILAE. Low, spiny species, with slightly flattened, narrowly cylindric or linear-oblong, readily detached ultimate joints, the main stem terete. We know three species, the typical one in Mexico and Guate- mala, one from Oaxaca, Mexico, and one Peruvian. In the structure of their joints they form a transitional series between Cylindropuntia and Platyopuntia, and might be included in either of these subgenera with about equal reason. KEy TO SPECIES. Young areoles with only 1 to 3 spines; joints 2 to 3 cm. thick. Plant 1 to 5 meters high; joints tubercled; spines yellowish...................-5--00555 77. O. pumila Plants about 2 dm. high; joints not tubercled; spines reddish to brown...............-. 77a. O. depauperata Areoles with 3 to 7 spines; plants 1 to 4 dm. high. Joints 1 to 1.5 cm. thick; areoles not blotched; spines brownish..................--++>- 78. O. pubescens Joints 2 to 3 cm. thick; young areoles dark-blotched; spines yellowish.................-. 79. O. pascoensis % Fic. 122.—Opuntia pumila forming low thickets. 77. Opuntia pumila Rose, Smiths. Misc. Coll. 50:521. 1908. Stems low, very much branched, the joints readily falling off when t velvety-pubescent, terete or sometimes slightly flattened, turgid, bearing more or less. sominens tubercles; areoles small, those of old stems bearing several slender spines, the longer ones dem. long; areoles of young joints usually bearing 2 yellowish spines; ovary pubescent with few spines or none; petals yellow, tinged with red, 15 mm. long; fruit globular, red, 15 mm. long. P Type locality: Near Oaxaca City, Mexico, on the road to Mitla. Distribution: Central and southern Mexico. When this species was described, attention was called to various forms which belonged here or to one or more related species. These we now refer to O. pubescens. Figure 122 is from a photograph of the type; figure 123 represents joints of the same. OPUNTIA. IoI 77a. Opuntia depauperata sp. nov. (See Appendix, p. 216.) 78. Opuntia pubescens Wendland* in Pfeiffer, Enum. Cact. 149. 1837. Opuntia leptarthra Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 10: 393. 1904, Plants small, usually low, sometimes 4 dm. high, much branched; joints easily becoming de- tached, nearly terete, glabrous or pubescent, 3 to 7 cm. long; spines numerous, short, brownish; flowers lemon-yellow but drying red; filaments greenish; style white; stigma-lobes cream-colored; fruit small, 2 to 2.5 cm. long, red, a little spiny, with a depressed umbilicus; seeds small, 3 mm. in diameter. Type locality: In Mexico. Distribution: Northern Mexico to Gua- temala. This species was sent to the Exposition Universelle at Paris by the Mexican Govern- ment in 1889, and was there seen and de- scribed by Dr. Weber as O. leptarthra. A part of this material finally went to the Hanbury Garden at La Mortola, Italy, whence we obtained specimens in 1913 which prove to be identical with specimens obtained by Dr. Rose and others in Mexico and Guatemala in 1905 to 1909. This is an insignificant species and hence has generally been overlooked in the region wheresomany more striking species are found. It is widely distributed, extending from the Fic. 123.—Opuntia pumila, Xo.4. State of Tamaulipas, in Mexico, to Guate- Fic. 124.—Opuntia pubescens. 0.75. mala, a much greater range than that of most species. Its wide distribution is doubtless due to the fact that the joints, which are cov- ered with barbed spines and are easily detached, fasten themselves to various animals and are scattered like burs over the country; each little joint thus set free starts a new center of distribution. ; This is a difficult plant to grow in greenhouses, for the spreading or hanging branches soon become entangled with other plants and break off in attempts to free or move them ; partly for this reason, doubtless, it rarely flowers in cultivation. Opuntia angusta Meinshausen (Wochenschr. Gartn. Pflanz. 1: 30. 1858) was unknown to Schumann. It was originally described as similar to the South American species, O. aurantiaca, and, if so, it must be near O. pubescens, if not identical with it, being a native of Mexico, where it was first collected by Karwinsky. ; Figure 124 represents joints of the Guatemalan plant, cultivated in the green- houses of the United States Department of Agriculture, Washington, obtained in 1907. 79. Opuntia pascoensis sp. nov. «ot *oh > oi : i ding, terete Stems erect and rigid, up to 3 dm. high; joints easily breaking apart, erect or ascen : or slightly flattened, 3 to 12 etn, jong, I. Sto 4 cm. broad, puberulent, hardly tuberculate put with faint upturned lunate depressions between the dark-blotched areoles; leaves minute » areo to 8 what elevated, filled with brown wool intermixed with longer white cobwebby fairs : spines 4 On young joints, more on older joints, acicular, yellow, 2 cm. long or less; glochids above Doubt. yellow, tardily developing; fruit globular, 1.5 cm. in diameter, naked below, thik b s but so far less of wide distribution, for the joints are easily detached and are distributed like burs, only two collections have been reported. a ecies to Catal. h. Herrnh. 1835, but we arrenbatisen Garden either in 1835 or about d by Pfeiffer to the pages given in his “Pfeiffer (Enum. Cact. 1837) frequently refers several of Wendland’s can find no references to Wendland having published a catalogue of the He that time. We have therefore cited all of Wendland’s species so referre numatio. 102 THE CACTACEAE. Collected by Dr. and Mrs. J. N. Rose in central and southern Peru, in 1914, first from just below Matucana (No. 18653), and later at Pasco (No. 18812, type). Plate xvi, figure 1, represents a joint of the type specimen above cited. Series 2. CURASSAVICAE. ‘This series is composed of 10, or perhaps 11, species of low plants, characterized by their fragile branches, the small joints separating and becoming detached very readily, more or less flattened or subterete. ‘They mostly inhabit the southern United States and the West Indies; one is known from Ecuador; the original home of one of the species recognized is unknown. Key TO SPECIES. Spines acicular. Joints oval, mostly not more than twice as long as wide; plants prostrate, little branched..... 80. O. curassavica Joints oblong to linear, 2 to 8 times as long as wide; plants ascending or erect, much branched. Joints narrowly linear, 1 to 2 cm. Wide.......... 0... 0c ccc tence eens 81. O. taylori Joints oblong to linear-oblong or obovate-oblong, 2 to 4 cm. wide. Joints oblong to linear, 4 to 8 times as long as wide; spines 1 to 3 cm. long. Joints not tubercled....... 0.0... eect ene tenet ene as 82. O. repens Joints tubercled, at least when young.............. 0... e ee 82a. O. pestifer Joints oblong to obovate-oblong, 2 to 3 times as long as wide; spines 3 to 5 cm. long... ..83. O. borinquensis Spines subulate. Spines white. Roots fibrous; spines at most of the areoles............00000 0000s cee cee eee e eee eees 84. O. militaris Roots tuberous; spines only at the upper areoles. ............ 0.0... c cece cee eee ene 85. O. nemoralis Spines brown. Joints oval to oblong. Joints scarcely repand; plant up to 2 dm............0 0.0. c cece cece cece encase 86. O. drummondit Joints strongly repand; plant 1 dm................. 00.0. cece cece eee ene eeees 87. O. tracyt _ Joints linear-lanceolate. 2.02.2... cece nent tent eens 88. O. pusilla Affinity uncertain... 2.0.0 ect ecc ec eee e bene ee eeeeetuneeeeee, 89. O. darrahiana 80. Opuntia curassavica (Linnaeus) Miller, Gard. Dict. ed. 8. No. 7. 1768. Cactus curassavicus Linnaeus, Sp. Pl. 469. 1753. Stems low, 5-jointed, light green, pros- trate and creeping or hanging over rocks; joints oval to oblong, decidedly flattened but thick, 2 to5cm. long, glabrous; leaves minute, soon withering; areoles small, bearing short wool and longer, white cobwebby hairs; spines 4 to many, acicular, 2.5 cm. long or less, yellowish, becoming white in age; glochids tardily de- veloping. Type locality: Curacao Island. Fic. 125.—Opuntia curassavica. Xo.75. Distribution: Curacao, Bonaire, and Aruba. Haworth (Syn. Pl. Succ. 196. 1812) describes three varieties, major, media, and minor, and later (Rev. Pl. Succ. 71. 1821) also describes the variety longa. O. curassavica elongata Haworth (Salm-Dyck, Hort. Dyck. 184. 1834), a name only, is supposed to be the same as var. longa. This is one of the oldest species of Opuntia, having been describ as 1696. For a long time it has been , g been described and figured as early SI unknown, the name having been transferred to a similar species, O. repens. In 1913 Dr. Britton visited Curacao, its native home, and re-col- lected it. Its flowers have not been described, and several residents informed him that they had never seen it in flower; Dr. Britton did not find it in flower on Curacao, nor has it flowered with us in cultivation; Haworth, who wrote about it in 1812 speaks of its being a shy bloomer, saying he had seen it in flower but once. In early English books it is called pin pillow, because its turgid joints suggest pincushions filled with pins Illustrations: Bradley, Hist. Succ. Pl. ed. 2. pl. 4, as Opuntia minima americana, etc.; Commerson Hort. pl. 56, as Opuntia curassavi int lort. pl. 56, ssavica minima; Plukenet : f. 3, as Opuntia minor caulescens. uaa ee Figure 125 represents the plant collected : J. A. Shafer in 1913. on Curacao by Dr. N. L. Britton and Dr. BRITTON AND ROSE PLATE XVII M. E. Eaton del, 1. Joint of Opuntia pascoensis. 3, 4. Forms of Opuntia repens. 5. Flower of same. 2. Joints of Opuntia taylori. 6. Flowering joint of Opuntia drummondii. (All natural size.) OPUNTIA. 103 81. Opuntia taylori Britton and Rose, Smiths. Misc. Coll. 50: 520. 1908. Opuntia hattoniana Britton and Rose in Johnston and Tryon, Rep. Prickly-Pear Comm. 97. 1914. Prostrate, widely branched; joints linear to linear-oblong, 12 cm. long or less, bright green, 1 to 2 cm. wide, turgid, glabrous or pubescent; areoles 1 to 1.5 cm. apart, not elevated; spines acicular, 3 to 6 at each areole, yellowish brown, becoming white, 4 cm. long or less; glochids yellowish brown, 3 mm. long; flowers yellow, small, the petals about 1 cm. long; ovary pyriform, 1 to 1.5 cm. long, its areoles with few bristles and spineless. Type locality: Between Gonaives and La Hotte Rochée, on road to Terre Neuve, Haiti. Distribution: Deserts of Haiti and of Azua, Santo Domingo. This species, while similar to O. repens, has more terete joints. It was first collected in 1905 in Haiti by Nash and Taylor, and upon this collection the species was based. In 1913 Rose, Fitch, and Russell collected it in the Azua desert of Santo Domingo. In this last collection the joints are pubescent, but otherwise the plants seem to be the same, although we at one time thought they might be distinct; in fact, in their report on the opuntias, Johnston and Tryon published the Santo Domingo plant as new, from notes given to them. Plate xvul, figure 2, represents joints of the plant collected by Rose, Fitch, and Russell at Azua, Santo Domingo, in 1913. 82. Opuntia repens Bello, Anal. Soc. Esp. Hist. Nat. 10: 277. 1881. Stems erect or ascending, 5 dm. high or less, commonly much branched, often forming dense, flat masses 4 meters in diameter, glabrous or pubescent, green or olive-green; joints oblong to linear 5 to 16 cm. long, 3.5 cm. broad or less, usually strongly flattened; areoles small, bearing brown wool and a few cobwebby white hairs; spines when very young pinkish, becoming brown, afterwards fading out, acicular, numerous, 3.5 cm. long, or less; glochids numerous, yellow, tardily developing; flowers 4m. broad, bright yellow, fading to salmon-colored; ovary and fruit with or without spines, fruit red, 2 to 3 cm. long, 1 to few-seeded. Type locality: Near Guanica, Porto Rico. Distribution: Porto Rico and its islands, Mona, Muertos, Vieques, and Culebra, to Virgin Gorda and St. Croix. Opuntia repens has long been confused with O. curassavica. It was first collected on St. Thomas, where it is abundant and a troublesome weed, and was illustrated by Pfeiffer and Otto in the year 1843. It was described by Bello in 1881, who thought it might be a variety of O. spinosissima. According to Bello, it is called olaga in Porto Rico, which is a corruption of ohulaga; the name suckers is used for it in the Virgin Islands. The plant is freely distributed by its fragile, clinging joints. Unlike its relative, O. curassavica, this plant flowers freely, blooming in late spring and summer. Opuntia repens Karwinsky in Salm-Dyck (Hort. Dyck. 361. 18 34) has been published only as a synonym, and therefore does not invalidate the use of Bello’s name. The plant is recorded by Johnston and Tryon (Rep. Prickly-Pear Comm. 95. 1914) as O. curassavica taylori. Illustration: Pfeiffer and Otto, Abbild. Beschr. Cact. 1: savica. Plate xvu, figure 3, represents joi by Dr. Britton in 1913; figure 4 is from a : on Virgin Gorda; figure 5 is copied from the illustration abo 82a. Opuntia pestifer sp. nov. (See Appendix p. 217.) 83. Opuntia borinquensis sp. nov. ; a dit Plants few-branched, forming colonies often 2 meters across, 5 dm. high or less somes re uly detached, oblong to obovate-oblong, dull green, glabrous, compressed but turgid, 5 to lar ¢ ong, 4 cm. wide or less, about 1.5 cm. thick; areoles small, 1 to 2 cm. apart, bearing 2 or 3 acicular spines, pl. 6, f. 2, as Opuntia curas- nts of the plant collected near Guanica, Porto Rico, plant obtained by the same collector the same year ve cited. 104 THE CACTACEAE. the larger up to 6 cm. long, brown when young, fading white; leaves subulate, acuminate, 1 to 2 mm. long; fruit obovoid, subtruncate, 1.5 cm. long. Limestone swale, Morillos de Cabo Rojo, Porto Rico (Britton, Cowell, and Brown, No. 4741), growing with O. repens Bello, from which it differs by its larger, broader, and flatter joints and much longer spines. The only locality known for this plant is at the extreme southwestern corner of Porto Rico, where numerous colonies of it were observed. The region is a very dry one, rain fall- ing there only at long intervals; the associated vegetation isof a highly xerophytic character. Figure 126 represents joints of the type specimen above cited. 84. Opuntia militaris sp. nov. Stems 3 dm. tall, the branches weak and more or less spreading; joints thick, narrowly oblong to obovate, 5 to 8 cm. long, somewhat shiny when young, easily breaking apart; spines 1 or 2 from an areole, occasionally more, acicular, white, 1 to 2 cm. long; flower-buds pointed; flowers small, 3 cm. long; petals greenish to cream-colored, tinged with pink; ovary small, its small areoles without spines. Collected by Dr. N. L. Britton, March 17 to 30, 1909, at the U. S. Naval Station, Guantanamo Bay, Oriente, Cuba (No. 1957). Figure 127 represents joints of the type specimen above cited. ) (| j ='s A i Sa LAY p_& TA —_ yes PAs 2 > = BRR ET \- je \W Y \ ae << Mu API RAIA IS > ¢; ‘ Y oY ° - to ‘ ra \ if a oo \\ . WAU \ WWW Fic. 126.—Opuntia borinquensis. Xo.5. Fic. 127.—Opuntia militaris. Xo.5. 85. Opuntia nemoralis Griffiths, Monatsschr. Kakteenk. 23:3 133. I913. Plants low, usually prostrate, forming clumps 1 meter in diameter i igh; joi ; , , sometimes 3 dm. high; joints ovate to obovate, thick, 7 to 9 cm. long, green, but often with purple blotches about the areoles; spines 1 or 2, only from the upper areoles, 2 to 2.5 cm. long, mostly erect; glochids yellow; flowers yellow; fruit obovoid to pyriform, small, 3 cm. long, light red, truncate. Type locality: Longview, Texas. Distribution : Pine woods and fields about Longview, Texas. TT his species in habit, joints, and spines suggests the Tortispinae; but on account of having easily detached joints we have referred it to the Curassavicae, as indicated in the original description, placing it between the Cuban species O. militaris and the United States species O. drummondii. It is known only from the type specimens. 86. Opuntia drummondii Graham in Maund, Botanist 5: pl. 246. 1846. Opuntia pes-corvi LeConte in Engelmann, Proc. Ame A : Opuntia frustulenta Gibbes, Proc. Elliott Soc. Nat. Hist. 1233) tag) Plant prostrate or spreading, 2 dm. or less hi i i Pla , . gh, from thickened single or sometimes moniliform roots; joints rather variable, narrowly linear to broadly oblong, with entire margins sometimes 12 cm. long and 5 to 6 cm. broad, usually light green, sometimes darker about the areoles; leaves 2 to a BRITTON AND ROSE PLATE XVIII E. Eaton del. 1t03 M. H. A. Wood del. 4,5 A ROEN BCD 1. Two plants of Opuntia drummondii. 3. Joints of Opuntia triacantha. 2. Joints of Opuntia retrorsa with flower. 4, 5. Joint and section of fruit of Opuntia jamaicensts. (All natural size.) OPUNTIA. 105 6 mm. long; spines (if present) solitary or 2 to 4, brownish red or gray, 2 to 4 cm. long; flowers yellow, 6 cm. broad; petals obovate; fruit red, juicy but insipid, obovoid to clavate, 22 to35 mm. long, 15 mm. in diameter at thickest part, bearing few areoles and no spines; umbilicus slightly depressed in the center; seeds 1 to 8, about 4 mm. broad. Type locality: Apalachicola, Florida. Distribution: Sandy soil from northern Florida to Pamlico Sound, North Carolina. In February 1916, Dr. J. K. Small visited the coastal islands near Charleston, South Carolina, for the purpose of collecting Gibbes’s Opuntia frustulenta. He found this species very common on Folly Island and on the Isle of Palms, where it grows abundantly in the sand, and also very variable as to shape and size of joints. He says the joints break off easily and attach themselves to one’s clothing like the sand spur, making progress over these islands difficult and painful. It is the common belief that this species rarely flowers. It usually flowers when first brought into cultivation, but rarely afterward, this doubtless being due to unsuitable green- house conditions. The fruit described was collected by Dr. J. K. Small, December 10, 1917, at Apalachicola, Florida, the type locality. According to Professor L,. R. Gibbes, it is known as dildoes about Charleston. Illustration: Maund, Botanist 5: pl. 246. Plate xvi, figure 6, represents flowering joints of a plant sent from La Mortola, Italy, to the New York Botani- cal Garden in 1912; plate xv, figure 1, shows the plant collected by Dr. Small on the Isle of Palms, South Carolina, in 1916. Herbarium specimens apparently representing a related species, were collected by W. L. McAtee at Cameron, Louisiana, in 1910 (No. 1955). oer 87. Opuntia tracyi Britton, Torreya II: 152. Fic. 128.—Opuntia tracyi. IQII. Low, diffusely much branched, pale green, to linear-oblong, flat, 6 to 8 cm. long, 1.5 to 2.5 cm. W flattened or terete, 1 cm. thick; areoles elevated, 5 to 10m darker tips, 3.5 cm. long or less; glochids numerous, ovary 1.5 cm. long, bearing a few triangular acute scale 2 mm. long; sepals triangular-ovate, 5 to 15 mm. long, green blotch; petals obovate, apiculate, 2 to 2.5 cm. long; In sandy soil near the coast, Biloxi, Mississippi. , Figure 128 is from a photograph of ethe plant collected by Mississippi, in 1911. about 2 dm. high or less; older joints oblong ide, about 1 cm. thick; young joints scarcely m. apart; spines I to 4, acicular, light gray with brownish; corolla pure yellow, 4 cm. broad; s similar to the outermost sepals, which are the outer green, the inner yellowish with a filaments yellow, 1 cm. long; anthers white. S. M. Tracy at Biloxi, 88. Opuntia pusilla Haworth, Syn. Pl. Succ. 195. 1812. Cactus pusillus Haworth, Misc. Nat. 188. 1803. , Cactus foliosus Willdenow, Enum. PI. Suppl. 35.) 7 3S: 1828 Opuntia foliosa Salm-Dyck in De Candolle, Prodr. 3: 47!- : ; hardly more or less flattened, sometimes nearly terete, hardly ae w har Cte ay prostrate: Joint aves 6 ¢ linear, early deciduous; areoles remote; spines tuberculate, light green in color; leaves 6 mm. long, 106 THE CACTACEAE. 1 or 2, subulate, usually brownish when young, in age straw-colored; flowers pale yellow, rather large for the plant; petals few, about 8, spreading, acute. Type locality: Not cited. Distribution: Usually assigned to South America, but not known from any definite locality ; Schumann, in his Keys, however, says West Indies. | This species has usually passed under the name of O. foliosa, although all writers seem to agree that the older name, O. pusilla, was given to the same species. It may belong in the series Aurantiacae rather than in the Curassavicae. Specimens distributed from European gardens as O. foliosa in recent years are not typical, and are probably referable to O. drummondit. Tephrocactus pusillus Lemaire (Cact. 88. 1868), an unpublished name, referred by Lemaire to his third section of Tephrocactus, may belong here. ‘The Index Kewensis refers it to Opuntia pusilla. Illustration: Pfeiffer and Otto, Ab- bild. Beschr. Cact. 1: pl. 18, as Opuntia foliosa. Figure 129 is copied from the illus- tration above cited. 89. Opuntia darrahiana Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 10:°388. 1904. Growing in masses, 2 to 2.5 dm. high 3.5 to 4 dm. broad, very much branched, joints 7 to 8 cm. long by 4 to 5 cm. broad, bright green to sea-green ; areoles somewhat elevated, especially when young, I cm. apart; spines 6, the two uppermost the longest, these 4 to 4.5 cm. long, all suberect, white or grayish white, more or less brownish at tip; glochids said to be wanting; flowers and fruit not known. Type locality: Turks Islands. Distribution: Known only from the type lo- cality. This species is known only from the Turks Islands, a small group at the southeastern end of the Bahaman Archipelago. It was introduced into Europe by the late Charles Darrah. We know the plant only from the above-cited description, and, so far as we have been able to learn, it is not now in cultivation, nor have we been able to find any herbarium specimens preserved. The opuntias known to us to inhabit Turks Islands are O. dillenii, O. nashti, and O. lucayana. The description of O. darrahiana does not agree with any of these. The species is referred to the series Curassavicae with doubt, but as this series has representatives in Florida, Cuba, and Hispaniola, the existence of one in the Bahamas is not improbable. Fic. 129.—Opuntia pusilla. Series 3. AURANTIACAE. The species of this series are low plants, mostly with readily detached joints: i often terete or turgid, the ultimate joints narrow and flat. They vahabit southeastern South Amer= ica. During the expedition to Brazil and Argentina conducted by Dr. Rose in the summer of 1915, only a few of the species here grouped were found; Dr. Shafer collected several of them in the winter of 1916-17. Dr. Spegazzini has given us photographs of several. We recognize 8 species, and have appended another, which may belong here. OPUNTIA. KEy To SPECIES. Joints not conspicuously purple-blotched under the areoles. Joints linear, elongated. Stem terete or subterete; branches mostly flat. Joints dark green, not tubercled Joints elongated, linear... 2... ccc ccc etc e ce ceeeeeeees 92. Joints linear-oblong... 20... c eee eee eeeeeeeevevnees 93- Joints short, elliptic. 2.00... ccc ccc cece ecb beeen eebeeennes 94. Joints more or less spiny. Joints flattened. Joints 2 to 3.5 cm. wide... 00... ccc cece nee eeeeeeeeevecees 95. Joints 3.5 to 6 cm. wide... 2.2... ccc cece n cece cent eeeveecreees 96. Joints subterete, turgid... 0.2 ccc eee eee eee eeeeveeeeees 96a. Joints spineless. 2.0... ccc v cee nee eeeeveteentveveeeteeeveeees 97. Perhaps of this series... 10... c cnc c cece eee eeeneeeeueuereeneueeens 98 107 . O. aurantiaca . . O. schickendantzti O. kiska-loro O. canina O. montevidensis O. retrorsa O. utkilio O. discolor O. anacantha . O. grosseiana 90. Opuntia aurantiaca Lindley, Edwards’s Bot. Reg. 19: pl. 1606. 1833. Opuntia aurantiaca extensa Salm-Dyck in Forster, Handb. Cact. 476. 1846. Low, much branched, and spread- ing; stem terete or subterete, 1 to 2 cm. thick; joints very fragile, linear, 6 to 8 cm. long, 1.5 to 2.5 cm. broad, almost terete at base, dark green, shin- ing; areoles somewhat elevated, filled with white wool; spines 2 or 3, brown- ish, 1 to 3 cm. long; flowers yellow, 2.5 em. broad; fruit 2 to 2.5 cm. long. Q Z| 9, Type locality: Chile (in error). Q Z, Distribution: Argentina and }, SS Uruguay. g Cactus aurantiacus Lemaire (Cact.87. 1868) is usually cited in | oi synonymy, but Lemaire only men- tions the name as a species of R Cactus. Itisin fact Gillies’s man- 7 uscript name, first published in the Botanical Register in 1833 # Z as a synonym of O. aurantiaca. O. extensa Salm-Dyck (Pfeif- Lp fer, Enum. Cact. 147. 1837) is also \ 9 2 gy given as a synonym. » A Remy states (Gay, Fl. Chilena °F 3: 25. 1847) that it grows in the Fie. 130—0. 21.0. schickendantzii. central provinces of Chile, but he aurantiac me aes probably had in mind some other plant, as O. aurantiaca is not known to be native of Chile by resident botanists. Illustrations: Anal. Mus. Nac. Montevideo s: pl. 34; Edwards's Bot. nee. 19: pl. 7000. Figure 130 represents a joint from a plant found by Dr. Rose, in Argentina, in 1915. 91. Opuntia schickendantzii Weber in Schumann, Gesamtb. Kakteen 688. 1898. Shrub-like, 1 to 2 meters high, much branched, grayish green; branches cylindric or flattened, Somewhat tuberculate; leaves minute, 2 mm. long, reddish; spines 1 or 2, flowers 4 cm. in diameter, yellow; fruit green, sterile. Type locality: In Tucuman, Argentina. Distribution: Northern Argentina. ; Figure 131 is from a photograph of a plant in subulate, 1 to 2 cm. long; Argentina contributed by Dr. Spegazzini. 108 THE CACTACEAE. Fic. 132.—Opuntia kiska-loro. 92. Opuntia kiska-loro Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 516. 1905. Prostrate, rooting, forming spreading clumps 3 to 6 dm. high; joints flat, at first very narrow, becoming lanceolate, 20 cm. long, 4 cm. broad, shining green; spines 2 to 4, un- equal, whitish, 4 to 6 cm. long; flowers orange, rather large, 3 to 6 cm. broad; filaments pale orange; stigma-lobes 6, flesh-colored; fruit 5 cm. long, deep violet-purple without, white within; seeds 5 mm. broad, pubescent. Type locality: Deserts of La Rioja, Catamarca, Argentina. Distribution: Northwest Argentina. Figure 132 is from a photograph of the type plant sent by Dr. Spegazzini. 93. Opuntia canina Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4:518. 1905. At first erect, then decumbent, 1 to 3 meters broad; joints flat, very narrow, atten- uate at both ends, 2.5 to 3.5 dm. long, 4.5 cm. broad, shining green; areoles on young joints unarmed; spines of areoles of older joints 1 or 2, sometimes 3, 1.5 to 3.5 cm. long, reflexed, subterete, grayish white with yellowish tips; flowers numerous, medium sized; ovary obo- void; corolla rotate, yellowish orange, 4 to 5 cm. broad; petals obovate; filaments yellow; stigma-lobes 5; fruit obovoid, 2.6 to 2.8 cm. long, red without, white within; seeds 4 mm. broad, white, lanate. Type locality: Near Pampablanca, Jujuy, Argentina. Fic. 133.—Opuntia canina. Distribution: Provinces of Jujuy and Tucuman, Argentina. Figure 133 is from a photograph sent by Dr. Spegazzini. OPUNTIA. 109 94. Opuntia montevidensis Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4:515. 1905. Cespitose, the branches 3 to 5 dm. high; joints 5 to 10 cm. long, obovate to elliptic; areoles not very prominent; spines usually 5, 3 longer and stouter, 2 very small, reflexed, and setiform, the 2 or 3 longer ones erect or spreading, 2 to 3 cm. long; flowers 4 to 5 cm. broad, orange-colored; fruit dark purple, clavate, 3.5 to 4 cm. long ; seeds lanate. _ Type locality: Cerro de Montevideo, Uruguay. Distribution: Cerro de Montevideo, and near La Colonia, Uruguay. 95. Opuntia retrorsa Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4:517. 1905. (?) Opuntia platynoda Griffiths, Bull. Torr. Club 43: 526. 1916. Stems prostrate, intricately branched, creeping, rooting at the nodes; joints linear-lanceolate, more or less attenuate at each end, flattened; areoles somewhat prominent, each subtended by a long, dull purplish blotch; spines 1 to 3, reflexed, white below, with pinkish tips; flowers yellowish, 4 to 5 cm. broad; fruit about 2 cm. long, violet-purple on the outside, light rose on the inside; seeds 2 to 2.5 mm. broad, somewhat villous. Fic. 134.—Opuntia retrorsa. Type locality: In the Territory of the Chaco, Argentina. Distribution: Northern Argentina. Plate xvi, figure 2, represents a plant from Argentina which flowered at the New _ York Botanical Garden in 1911. Figure 134 is from a photograph sent by Dr. Spegazzini. 96. Opuntia utkilio Spegazzani, Anal. Mus. Nac. Buenos Aires III. 4: 516. nn lone: joints flat Low, creeping plant, rooting at the joints, with elongated branches 5 to 15 dm. tong, jolts ta" el liptic-linear, 1s fo 30 cm. long, 5 to 6 cm. broad; spines at first 2 or 3, the upper one tonger, rater more numerous, reflexed; flowers small, 3.5 to 4 cm. broad, yellowish; ovary obovord, reds > spiny; fruit small, 3 cm. long, fleshy, insipid, reddish violet both within and without; seeds sub- orbicular, 4 mm. broad, lanate. Type locality: Province of Tucuman, Argentina. Distribution: Northern Argentina. _ Figure 135 is from a photograph sent by Dr. Spegazzini. 96a. Opuntia discolor sp. nov. (See Appendix, p. 218.) 97. Opuntia anacantha Spegazzini in Gosselin, Bull. Mus. Hist. Nat. Paris 10: 391. tela beri Usually decumbent and rooting along the under surface, sometimes ascending and cam ering, 1 to 2.5 meters long; joints unarmed, dark green except for purple spots under toe cmall, flow 1 , 3.5 to7 cm. broad; areoles small; flowers are artes NaTTOW EM toa oa ones §. or nein diameter: sepals large, reddish, obtuse, large, numerous, yellowish orange, 4 cm. long, 5 to 6 cm. in ; ; . emarginate or even 2-lobed ; petals 12; style white; stigma-lobes white or rose-colored; fruit 3 cm. long, red, the pulp yellowish or white. Type locality: In the southern Chaco, Argentina. Distribution: Northeastern Argentina. Figure 136 is from a photographof a part of the type plant, received from Dr. Spegazzini. 110 THE CACTACEAE. 98. Opuntia grosseiana Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 10: 391. 1904. Described as having joints intermediate between those of Opuntia elata and O. anacantha, and resembling these species. Type locality: In Paraguay. Distribution: Paraguay. Introduced from Paraguay by Hermann Grosse; known to us only from the description. Series 4. TUNAE. Bushy, ascending, depressed, or erect plants, with rather large and more or less readily detached joints, bearing acicular or subulate, often numerous, yellow or white spines. The species inhabit the West Indies, Mexico, Guatemala, and northern South America. Fic. 135.—Opuntia utkilio. Fic. 136.—Opuntia anacantha. KEY TO SPECIES. Joints glabrous. Spines slender, acicular. Spines white. Joints dull. Joints dark green, repand; areoles somewhat elevated O. b i 1 , ; areoles somewhat elevated. ................ . O. bella Joints light green, not repand; areoles not elevated. 99 Spines several at the areoles; plant ascending.................... 100. O. triacantha Spines 1 to few at the areoles or often wanting; plant erect Joints shining ees OF olen wanting; Plant erect... -. 101. O. jamaicensis eee ee ee een rene ee ee eee eet e een eeeeenenens 101d. O. guatemalensis eee eee ee eee eee 102. O. tuna Spines white; joints relatively thick, turgid.................................. 102a. O. pennellii Joints repand; spines bright yellow............... L Joints not repand; spines ‘pale yellow............................... Lose, 6. Ona Plants tall, 1 to2 metershigho °eeses—“‘i—sSs—s—sSSS — Joints obovate or broadly elliptic I ints obovate or broadly elliptic...........00.00.000000000 000. c cee 104. O. Joints narrowly oblong or oblong-obovate........................... rosa. 0. ‘aequatorialis a ee eee — OPUNTIA. III Joints pubescent. Areoles surrounded by purplish spots..........0.0.0.00 0000000 c cc cece cece cece eveeees 105. O. decumbens Areoles not surrounded by purplish spots...........0.00 0000.0 cece cece cece eens 106. O. depressa 99. Opuntia bella sp. nov. Stems low, 10 to 12 dm. high, forming thickets; joints oblong, repand, 10 to 16 cm. long, dull dark green; areoles 1 to 2 cm. apart, somewhat elevated, small, filled with short brown wool and glochids; leaves minute, 1.5 to 2.5 mm. long; spines white, 2 to 6, unequal, acicular, the longer ones about 2 cm. long; flowers 5 cm. long, “‘sulphur-yellow turning to orange-red;’’ petals 20 to 22 mm. long; ovary deeply umbilicate; ‘‘fruit small, greenish yellow.” Koger : Z. | <4 4 ; : { 137.—Opuntia bella in the foreground. Type locality: Venticas del Dagua, Dagua Valley, western cordillera of Colombia. Distribution: Western Colombia. The type is based upon plants collected by Mr. Henry Pittier in the State of Cauca, Colombia, in 1906, and grown ever since in Washington and New York. e species is very common in Cauca, forming with other cacti impenetrable thickets. k C Figure 137 is from a photograph by Mr. Pittier of the type plant, tat en neat auica, Colombia, in 1906; figure 138 is from a photograph by the same collector, showing flowering and fruiting joints; figure 139 represents a single joint. 112 THE CACTACEAE. 100. Opuntia triacantha (Willdenow) Sweet, Hort. Brit. 172. 1826. Cactus triacanthos Willdenow, Enum. Pl. Suppl. 34. 1813. Stems half procumbent or clambering over rocks, sometimes even erect but always low; joints turgid, oblong, 4 to 8 cm. long, the terminal and often the second and third ones breaking off easily; spines usually 3, white but often drying yellowish, 4 cm. long or less; flowers, including the ovaries, 5 cm. long, brownish yellow to cream-colored, tinged with pink; petals obtuse; filaments and style pale green; fruit 2.5 cm. long, red, spineless. Type locality: Not cited; cultivated in the Berlin Garden. Distribution: Desecheo Island, Porto Rico; Lesser Antilles, St. Thomas to Guadeloupe. o] Fic. 138.—Opuntia bella. Xo0.75._ - Fic. 139.—Opuntia bella. 0.66. When published, the origin of this species was uncertain. It has been referred to the South American flora, but if our interpretation is correct it is a West Indian plant. It was introduced into cultivation in 1796. This species is very common on flats or low hills and, so far as our observation goes, is never found very far inland in the Lesser Antilles. Professor Schumann’s description includes two species, one of which belongs here and one in the Streptacanthae, perhaps as Mr. Berger thinks to O. amyclaeca—and a tall plant, 3-5 meters high, is now grown in Italy under that name. The Index Kewensis refers O. triacantha as a synonym of O. curassavica, which is erroneous if our interpretation of it 1s correct. Plate xvii, figure 3, represents joints of the plant collected on Antigua by Rose, Fitch, and Russellin 1913. Figure 140 is from a photograph taken on St. Chri iti t Indies, by Paul G. Russell in 1913. gee Christopher, British Wes BRITTON AND ROSE PLATE XIX Opuntia jamaicensis. ~ ep et i — a’) ‘Plant. 2,3. Flower. 4. Longitudinal section of flower. 5,6. Stamen. OPUNTIA. 113 An Opuntia collected by H. Pittier in Costa Rica and now growing in the cactus house of the U. S. Department of Agriculture has not been identified. It resembles somewhat Opuntia triacantha, but is much out of the range of that species and differs from it in some important respects. The joints are small, obovate to oblong, rounded at apex, dark green with purple blotches below the areoles, with low, broad tubercles; margin of the areole bearing short white hairs; spines usually wanting, but cultivated specimens bear a single short spine 6 to 7 mm. long from an areole. Fic. 140.—Opuntia triacantha. 101. Opuntia jamaicensis Britton and Harris, Torreya 11: 130. 1911. Erect, 1 meter high, with a short subcylindric trunk; branches several, ascending, joints dull green, obovate, much narrowed at base, flat, rather thin, readily detached, 7 to 13 cm. long, 5 to 7-5 cm. wide; areoles about 2.5 cm. apart; spines 1 to 5, usually only 2, acicular, unequal white, 2.5 cm. long or less; flowers 4 cm. broad; petals 16 to 18; filaments greenish white; ty e y ite; stigma-lobes 7 or 8, creamy white; fruit pyriform, red, 3.5 to 4 cm. long; seeds 4 mm. broad. Type locality: St. Catherine, Jamaica. Distribution: Plain south of Spanish Town, Jamaica. The following figures are from paintings by Miss H. A. Wood: suit: plate xix Plate xvi, figure 4, shows a fruiting joint; figure 5 is of a section of the nw ; pla . i" , figure 1, shows the type plant about one-third natural size; figures 2, 3, and 4 are of the flowers; figures 5 and 6 show the stamens; figure 7 represents the style. 1012. Opuntia guatemalensis sp. nov. (See Appendix, p. 218.) 102. Opuntia tuna (Linnaeus) Miller, Gard. Dict. ed. 8. No. 3. 1769. Cactus tuna Linnaeus, Sp. Pl. 468. 1753. Cactus humilis Haworth, Misc. Nat. 187. 1803. Opuntia humilis Haworth, Syn. Pl. Suce. 189. 1812. Opuntia polyantha Haworth, Syn. Pl. Suce. 190. 1812. 326 Cactus polyanthos Sims, Curtis’s Bot. Mag. 53: pl. 209" O20. Opuntia multiflora Nicholson, Dict. Gard. 2: 503. 1885. i i01 times up to 16 cm. long, obovate . Plants 6 to 9 dm. high or less; joints usually small, but some ( ng, o| to oblong, light green, except above ihe areoles and there brownish ; leaves fuganiouss ireoles arge; spines 2 to 6, usually only 3 to 5, slightly spreading, light yellow; glochi \ y ow! ont yellow 5 cm. broad; sepals orbicular, yellowish, with a purple stripe along the center; p } ; 114 THE CACTACEAE. slightly tinged with red, oblong, rounded at apex; filaments short, greenish below; style and stigma- lobes cream-colored or yellowish; ovary bright green, narrowed downward; fruit red, obovoid, about 3 cm. long; seeds 3 to 4 mm. broad. Type locality: Jamaica. Distribution: Southern side of Jamaica, West Indies. Opuntia tuna is one of the old Cactus species. It was described by Linnaeus as Cactus tuna and by Philip Miller as Opuntia tuna. In the early part of the Nineteenth Century it was renamed Opuntia humilis and also O. polyantha, and has long passed under the latter name. Opuntia tuna, however, is one of the commonest Opuntia names in our botanical literature. This is due partly to the fact that the name was early transferred to Opuntia dillenti, one of the most common species, both wild and cultivated, and partly because tuna is the Fic. 141.—Opuntia tuna. Fic. 142.—Opuntia tuna. Xo.5. common Mexican name for opuntias, and many species have therefore been identified as O. tuna. So far as our studies indicate, this species is confined to the Jamaica lowlands. Opuntia multiflora is referred here, although we do not know the plant. It is figured by Nicholson (Dict. Gard. Nicholson 2: f. 754); this figure is republished by Riimpler (Forster, Handb. Cact. ed. 2. f. 130), and by Knippel (Kakteen, pl. 28), both calling it Opuntia polyantha; while W. Watson (Cact. Cult. f. 79) uses the same illustration, calling it O. dillenit. Opuntia coccinea (Pfeiffer, Enum. Cact. 161. 1837) is given as a synonym of O. tuna, but it was never published; it is doubtless different from O. coccinea Rafinesque (Med. F'. U.S. 2: 247. 1830), also unpublished. The following names seem to belong here, but were not formally published: Opuntia flexibilis (Pfeiffer, Enum. Cact. 161. 1837); O. tuna humilis Salm-Dyck (Cact. Hort. Dyck. 1844. 46. 1845); O. tuna laevior Salm-Dyck (Hort. Dyck. 186. 1 834) ; and O. tuna orbiculata Salm-Dyck (Cact. Hort. Dyck. 1844. 47. 1845)- Illustrations: Loudon, Encycl. Pl. ed. 3. f. 6878, as Cactus tuna; Wiener Illustr. Gartenz. 10: f. 114, as Opuntia humilis; Blithende Kakteen 2: pl. 75; Forster, Handb. Cact. OPUNTIA. 115 ed. 2. f. 130; Knippel, Kakteen 2: pl. 28, these three as Opuntia polyantha; Curtis’s Bot. Mag. 53: pl. 2691, as Cactus polyanthos; De Candolle, Pl. Succ. Hist. 2: pl. 138!4, as Cactus opuntia polyanthos; Descourtilz, Fl. Med. Antil. pl. 513, as Cactus opuntia. Figure 141 is from a photograph of a plant collected by William Harris, near Kingston, Jamaica, in 1913; figure 142 represents a joint of the same plant. 102a. Opuntia pennellii sp. nov. (See Appendix, p. 219.) _ 103. Opuntia antillana Britton and Rose, Brooklyn Bot. Gard. Mem. 1: 74. 1918. Growing in dense clumps, often 1 meter broad, more or less prostrate; joints usually obovate, 7 to 20 cm. long, narrow and nearly terete at base; terminal joints easily breaking off; leaves conic- subulate, about 2 mm. long; areoles large, 2 to 3 cm. apart, containing soft brown wool; spines stout, terete, 3 to 6 at an areole, unequal, 1 to 6 cm. long, yellow but becoming gray to nearly white in age; glochids numerous, yellow; flowers 5 to 7 cm. long; petals broad, obtuse, yellow, turning reddish in age; fruit reddish purple, 4 cm. long. + —— i i ing thickets. , Fic. 143.—Opuntia antillana forming Type locality: Near Basse Terre, St. Christopher, Rose, Fitch and Russell, No. 3230, February 2, 1913. Distribution: St. Christopher, St. Croix, Tortola, St. Thomas, Porto Rico, and Hispaniola. This species is one of the most widely distributed in the West Indies and, on some of the islands on which it occurs, generally the most abundant. This is partly due to the fact that the terminal joints are easily de- tached and may thus be widely scattered. The question has frequently been raised in our minds whether this species may not be of hybrid origin. It has some resemblance to O. dillenii, but has much smaller joints and these very fragile. What the other parent would be is not so clear. The fragile jomts would suggest O. triacantha or O. repens, but otherwise there is no close alliance with either of these. Owing Fig. 144.—Opuntia antillana. 0.33. to the fact that it is more common than any of these species, and is often not associated with any of them, w e believe it to be distinct. In the 116 THE CACTACEAE. desert of Azua, Santo Domingo, this is the dominant cactus, forming dense, impenetrable thickets on the low coastal plain. In the wild state the Azua plant has the joints often bronzed or purple. On Tortola and St. Thomas it occurs with O. dillenti and O. repens, and is there called bull suckers. Figure 143 is from a photograph taken by Paul G. Russell in 1913 near Azua, Santo Domingo; figure 144 represents joints of the type plant. 103a. Opuntia caracasana Salm-Dyck. (See Appendix, p. 219.) 104. Opuntia wentiana sp. nov. Opuntia tunoides Britton and Shafer in Boldingh, Fl. Ned. W. Ind. Eiland 300. 1913. Not O. tunoidea Gibbes. Plant erect, much branched, 1 to 2 meters high: joints obovate to elliptic, rather thin, up to 25 cm. long, usually rounded at apex, pale green, slightly glaucous; terminal joints somewhat fragile; leaves small and subulate; spines on young joints usually 3, afterwards 4 or 5, when young pale yellow but soon white; flowers small, 6 to 7 cm. long including the ovary; petals pale yellow, 3 cm. long, obovate, acute; style cream-colored; fruit small, red. Type locality: Curagao. Distribution: Venezuela, and the neighboring islands, Margarita, Bonaire, Curagao, and Aruba. Dr. Rose found this plant repeatedly in Venezuela and writes of it as follows: Very common not only on the savannas along the coast but also on the neighboring hills along with Lemaireocereus, Cephalocereus, and other cactus genera; its more or less fragile joints, yellowish spines, bushy stature, and structure of flowers ally it with the Tunae. This species has been confused with the Jamaican Opuntia tuna (Linnaeus) Miller, which it resembles. Named in honor of Professor F. A. F. C. Went, distinguished Dutch botanist. ‘ 104a. Opuntia aequatorialis sp. nov. (See Appendix, p. 219.) 105. Opuntia decumbens Salm-Dyck, Hort. Dyck. 361. 1834. Opuntia puberula Pfeiffer, Enum. Cact. 156. 1837. Stems low, often creeping or trailing, rarely over 4 dm. high; joints 1 to 2 dm. long, oval to oblong, covered with a short, soft pubescence; areole usually small, surrounded by a purple blotch, bearing yellow glochids and wool, the wool cobweb-like on very young joints; spines often wanting, usually solitary but sometimes numerous, slender or rather stout, 4 cm. long and yellow; flowers numerous, small, including the ovary about 4 cm. long; petals dark yellow; fruit deep purple, very juicy; seeds about 4 mm. broad. Type locality: In Mexico. Distribution: Guatemala and Mexico as far north as Mazatlan and Tamaulipas. Opuntia repens Karwinsky (Salm-Dyck, Hort. Dyck. 361. 1834) and O. irrorata Mar- tius are usually given as synonyms of this species, but as they were printed without descriptions, they should hardly be referred to synonymy. The species has long been in cultivation, a colored illustration having been published in Curtis’s Botanical Magazine in 1841. It grows luxuriously in greenhouses, flowering profusely in the spring. We have referred here Opuntia puberula Pfeiffer, which seems to be different from the plant now grown in collections under that name. Pfeiffer’s original description, based upon sterile plants alone, may be paraphrased as follows: Joints thick, obovate, 7.5 to 12.5 cm. long by 5 to 7.5 cm. broad, puberulent, green; areoles somewhat remote, each surrounded by a red spot, bearing in the upper part a bunch of short glochids and below 2 to 4 slender, white, divergent spines, the longer ones 8 mm. long; leaves 4 mm. long, acute, red at apex. Labouret’s description of 1853, of O. puberula Pfeiffer, is very similar to Pfeiffer’s, except that he states that the spines are 9 cm. long. Both these descriptions answer very BRITTON AND ROSE M. E. Eaton del. 1, 2. ’ Flowering and fruiting joints of OP untia decumbens. (All natural size.) m8 PLATE XX Probable hybrid,with fruit and flower. OPUNTIA. 117 well to the plant which we know as Opuntia decumbens, originally described from plants growing in the Botanical Garden in Vienna. Opuntia decumbens irrorata Forbes (Hort. Tour. Germ. 158. 1837) is doubtless the same as O. irrorata Martius (Pfeiffer, Enum. Cact. 154. 1837). These and O. decumbens longispina Salm-Dyck (Haage and Schmidt, Haupt-Verzeichnis 1912: 230. 1912) pre- sumably belong here. Opuntia parvispina Salm-Dyck (Cact. Hort. Dyck. 1849. 238. 1850), described from garden specimens of unknown origin, without flowers, has never been definitely placed. Schumann lists it among his unknown species, but attributes it to Mexico. Salm-Dyck states that it resembles O. puberula, but that it is glabrous. Illustrations: Curtis’s Bot. Mag. 68: pl. 3914; Bliihende Kakteen 3: pl. 132. Fic. 145.—Opuntia decumbens. Plate xx, figure 1, represents a flowering joint of a plant collected by Dr. MacDougal and Dr. Rose at Tehuacdn, Mexico, in 1906; figure 2 represents a fruiting joint of a plant collected by William R. Maxon at El Rancho, Guatemala, in 1905. Figure 145 is froma photograph of the plant taken at Tomellin, Mexico, by Dr. MacDougal in 1906. 106. Opuntia depressa Rose, Smiths. Misc. Coll. 50: 517. 1908. m. high and forming a patch 3 to 4 meters in pubescent, when young, obovate, 20 cm. long, le. sometimes with 1 to 3 shorter ones, all ach areole; flowers red; fruit small, th a broad, deep umbilicus. _ Low, creeping or spreading plant, sometimes 60 c diameter; joints of a dark glossy yellowish green color, usually with 1 long, somewhat curved spine at each areo yellowish; old joints oblong, 30 cm. long, bearing 4 to 6 spines at ez globular, with large clusters of brown glochids, when immature w1 Type locality: Near Tehuacan, Mexico. Distribution: Southern Mexico. ; This plant is very common about Tehuac4n, growing carnea, and Echinocactus. Figure 146 is from a photograph taken by Dr. MacDouga with species of Agave, Beau- 1 of the type plant. 118 THE CACTACEAE. Fic. 146.—Opuntia depressa, in the foreground. Series 5. BASILARES. We recognize eight species as forming this series. They are low or bushy, much branched plants, with flat, thin, broad joints, the areoles small, usually numerous and close together. KEY TO SPECIES. Joints papillose, not pubescent. Fruit juicy, red... 2... cc ccc bbb bebe bbb bebe beens. 107. O. lubrica Fruit dry or nearly dry... 2.0 b bbc bbb be ee ee cece. 108. O. treleaset Joints mostly manifestly pubescent. Spines none or few. Flowers red... eect eee e bebe e eee treeeeees 109. O. basilaris Flowers yellow to orange. Joints bright green. Clochids long eee ce ce eee acer tet eee eee t seen teste eteeeeesencecerees 110. O. microdasys ochids short... 0... 0... cece enn e teen nee eeeneeeus 111. O. macrocalyx Joints grayish green... ccc cece bc eee ee ccce ee eee. 112. O. rufida » Spines very numerous. Areoles close together... 00... ccc eee eee eeebbeeeeeeee. 113. O. pycnantha Areoles distant... 66.00. e ete ete eeeeeteneeeneeee, 114. O. comonduensis 107. Opuntia lubrica Griffiths, Rep. Mo. Bot. Gard. 21: 169. 1910. “A low ascending, spreading species very similar in habit to O. microdasys, frequently 414 dm. high and when well developed 10 dm. or more in diameter; joints sub-circular to obovate, about 15 by 20 cm., or in case of last joints of previous year about 12 by 15 cm., bright, glossy, leaf-green, very evidently papillate but scarcely pubescent under a lens; leaves subulate, cuspidate-pointed, 6 to 9 mm. in length; areoles 15 to 22 mm. apart, 4 to 6 mm. in diameter, sub-circular, prominent; spicules prominent, 4 to 5 mm. in length, erect, bushy, in crescentic tufts in upper portion of areoles, becom- ing much more numerous in age, and at 2 to 4 years completely filling the areole, and, like O. rufida and some other species, becoming very abundant and conspicuous by proliferation of areolar tissue into short raised or columnar structures; spines exceedingly variable, sometimes nearly absent, again quite abundant and irregularly distributed, none to many, mostly 1 to 3, becoming more numerous with age and in scattering areoles to as high as 16, mostly about 12 mm. long, but sometimes 214 cm., yellowish, translucent, bonelike, sometimes darker at base; fruits decidedly acid, light red without with yellowish green rind and red pulp; seed small, thin shelled, about 3 mm. in diameter.”’ Type locality: Near Alonzo, Mexico. Distribution: Known only from the type locality. OPUNTIA. 119 Our examination of a painting of this plant in the collection made by Dr. Griffiths showed it to have great similarity to Opuntia rufida. Illustration: Rep. Mo. Bot. Gard. 21: pl. 23. Figure 147 is copied from the illustration above cited. 08. Opuntia treleasei Coulter, Contr. U.S. Nat. Herb. 3: 434. 1896. Opuntia basilaris treleasei Toumey, Cycl. Amer. Hort. Bailey 3: 1147. I901. Opuntia treleasei kerniit Griffiths and Hare, N. Mex. Agr. Exp. Sta. Bull. 60: 81. 1906. Low, sometimes 3 dm. high, spreading at base, some of the branches of 2 to 4 erect joints; joints obovate, 15 cm. long or more, fleshy, pale bluish green, glabrous, terete at base; areoles numerous, filled with dirty yellow glochids, usually without spines, sometimes quite spiny; flowers rose-colored; fruit dry, subglobose, with large areoles filled with glochids and sometimes bearing spines; seeds large, turgid, 7 cm. in diameter. Type locality: Caliente, in the Tehachapi Moun- tains, California. Distribution: Southern California. Figure 148 is from a photograph of the plant grow- ing on the mesa southeast of Bakersfield, California, taken by Dr. MacDougal in 1913. 7 109. Opuntia basilaris Engelmann and Bigelow, Proc. Amer. Acad. 3: 298. 1856. Opuntia basilaris ramosa Parish, Bull. Torr. Club 19:92. 1892. . Opuntia intricata Griffiths, Proc. Biol. Soc. Washington 29: Fic. 147.—Opuntia lubrica. 10. 1916. tee ee Fic. 148.—Opuntia treleasei, Southern California. 120 THE CACTACEAE.’ Stems low, growing in clumps, either prostrate or erect, sometimes 12 dm. high; joints broadly obovate, 8 to 20 cm. long, slightly pubescent or glabrous, usually highly colored; leaves 2 to 5 mm. long, subulate; areoles numerous, filled with white to brown wool and brownish glochids; spines none or rarely a few at upper areoles; flowers large, 6 to 8 cm. long, deep purple or sometimes white; filaments purple; fruit dry, globular to obovoid; seeds large, thick, 6 to 10 mm. broad. Type locality: From Cactus Pass down the valley of the Bill Williams River. Distribution: Northern Sonora, western Arizona, southern California, Nevada, and southern Utah. This is a variable species as to habit, size, pubescence, and color of flowers. The » variety ramosa described by Mr. Parish is more erect than the ordinary form and glabrous. It has large, handsome flowers, and is a splendid plant for outdoor cultivation where the climate is suitable, but does not live long in greenhouses. It is called beaver-tail in Arizona. Opuntia humistrata Griffiths (Bull. Torr. Club 43: 83. 1916) we refer here from the description; it is said to differ from O. basilaris ‘‘by its much smaller as well as different shaped joints”; it was found in the San Bernardino Mountains, northern California, within the range of O. basilaris. The following varieties are listed, but have not been described: albiflora} coerulea, nana, and pfersdor ffit. Opuntia basilaris cordata is a garden plant briefly described by F. Forbes (Monatsschr. Kakteenk. 16: 46. 1906), of which we have seen no specimens. Illustrations: Cact. Journ. 1: 167; Dict. Gard. Nicholson 2: f. 750; Forster, Handb. Cact. ed. 2. f. 129; Pac. R. Rep. 4: pl. 13, f. 1 to 5; pl. 23, f.14; Ritmpler, Sukkulenten f. 123: W. Watson, Cact. Cult. f. 76; Cact. Journ. 1: pl. October, as Opuntia basilaris var. cristata and var. nevadensis; Alverson, Cact. Cat. frontispiece, as Opuntia basilaris albiflora. Fic. 149.—Opuntia basilaris. Figure 149 is copied from Pac. R. Rep. 4: pl. 13, f. 1, an illustration cited above. Opuntia brachyclada Griffiths (Proc. Biol. Soc. Washington 27: 25. 1914) is an anom- alous plant with some of the joints terete and others somewhat flattened. It has been suggested that it is a hybrid between a cylindric and a flat-jointed species; but, so far as we know, natural hybrids do not occur between species of these subgenera. It is more likely to be an anomalous form of Opuntia basilaris, a form of which is known in the same mountains where it was found. 110. Opuntia microdasys (Lehmann) Pfeiffer, Enum. Cact. 154. Cactus microdasys Lehmann, Ind. Sem. Hamburg. 16. Opuntia pulvinata De Candolle, Mém. Mus. Hist. Nat. Paris 17: 119. 1828 Opuntia microdasys minor Salm-Dyck, Hort. Dyck. 186. 1834 Opuntia microdasys laevior Salm-Dyck, Cact. Hort. Dyck. 1849. 241. 1850. Often low and creeping but sometimes nearly erect and 4 to 6 dm. high; joints oblong to orbicu- lar, 10 to 15 cm. long, soft-velvety, usually pale green, spineless: areoles conspicuous ‘Closely set, filled with numerous yellow or brown glochids; flowers usually produced in abundance 4 to 5 cm. long, pure yellow or tinged with red; sepals acuminate; petals broad, retuse: filaments and style white; stigma-lobes 6 to 8, green; fruit dark red, juicy, nearly globular; seeds small, 2 to 3 mm. broad. Type locality: In Mexico, but originally stated by Lehm Distribution: Northern Mexico, y y ann as coming from Brazil. 1837. 1827. ee ee ee ee eee eee ww OPUNTIA. 121 In spite of its troublesome glochids, which easily become detached, this species has long been a greenhouse favorite. No cactus collection, however small, lacks one or more pots of this species, which rarely grows large in cultivation. Opuntia microdasys is usually credited to Lehmann, but he apparently published it as Cactus microdasys, and this is the way it is cited in the Index Kewensis. Lehmann soon republished this species (Nov. Act. Nat. Cur. 16: 317) where it appears as Cactus (Opuntia) microdasys. ‘The first use of the name of Opuntia microdasys was by Salm-Dyck (Hort. Dyck. 186) in 1834, but was without description or synonymy. Pfeiffer in 1837, however, republishes Lehmann’s description under Opuntia and is therefore cited as the author of the binomial. Here it is first cred- ited to Mexico, although Lehmann stated definitely that it comes from Brazil; this he does also with regard to Opuntia tunicata and Cactus bradypus, both Mexican species, while Fic. 151.—Opuntia, probable hybrid. Fic. 150.—Opuntia microdasys. o Mexico, are known only from South America. C Lopes . . dited t actus linkii and ’C. ottonis, both credi it might very well be the same as If this Opuntia really came originally from Brazil, Opuntia inamoena. As shown above (p. 116), Opuntia puberula is referred to O. decumbens. The O. puberula of our gardens, however, is quite a different plant, and in all probability is of hybrid orig. It is almost identical with a hybrid between O. microdasys and O. cantabrigien ts r ich r Rose collected in Hidalgo, Mexico, in 1905, and which is now grown in the collecti Washington and in the New York Botanical Garden. . | aor f 76. Illustrations: Agr. Gaz. N.S. W. 25: pl. opp. Pp. 138; p. 138; Gard. Chron. ct. 30: 76; Rep. Mo. Bot. Gard. 19: pl. 28, in part; 20: pl. 12, in part; Salford, Ann. ep. > s. inst. 1908: pl. 10, f. 4; U. S. Dept. Agr. Bur. Pl. Ind. Bull. 262: pl. 5, !. 2. . sar. Plate xxit, figure I, represents joints of the plant grown ina garden at Ry ersides Cal ifornia, received by Dr. Rose in 1905. Figure 150 1s from a photograp y ‘ F. E. Lloyd in Zacatecas, Mexico, in 1908. 122 THE CACTACEAE. Plate xx, figure 3, shows a flowering joint of a plant sent to the New York Botanical Garden by M. Simon, of St. Ouen, Paris, France, in 1901, as Opuntia puberula. Figure 151 is from a photograph of the plant sent from La Mortola, Italy, to the same institution in 1912, as Opuntia puberula. 111. Opuntia macrocalyx Griffiths, Rep. Mo. Bot. Gard. 19: 268. 1908. ‘A profusely, divaricately branched, ascending or erect, spreading plant, 9 to 10 dm. high and about the same in diameter; joints long-obovate, variable but commonly 9 by 22 cm. for last year’s growth, gray green, pubescent, velvety to the touch; areoles subcircular, usually 2 to 3 mm. in diameter, very close to 1 cm. apart, slightly sunken; wool tawny, prominent, as long as spicules and occupying lower half of areole; spicules reddish brown, about 1 mm. long, occupying upper half of areole, easily separable and causing fully as much annoyance in handling as those of O. microdasys, in age often appearing dirty yellow in situ but distinctly reddish brown when removed; strictly spineless; flowers yellow, green outwardly, the leaves on ovary very long subulate and changing . gradually into the sepals which are very long subulate, delicately pointed, loosely arranged or often half recurved at apex, giving to the bud a rather ragged appearance; fruit red but both pulp and rind greenish, long obovate to cylindrical, about 2 by 7 cm., with but few rather small seeds, about 3 mm. in diameter.”’ Fic. 152.—Opuntia macrocalyx. Xo.75. Fic. 153.—Opuntia rufida. Type locality: In cultivation at Riverside, California. Distribution : Known only from cultivated plants; perhaps also from Coahuila, Mexico. [llustration: Rep. Mo. Bot. Gard. 19: pl. 28, in part. F igure 152 is drawn from a joint of the plant collected by Edward Palmer at Saltillo, Mexico, in 1904. 112. Opuntia rufida Engelmann, Proc. Amer. Acad. 3: 298. 1856. Opuntia microdasys rufida Schumann, Gesamtb. Kakteen 706. 1898. More or less erect, 2 to 15 dm. high, with a somewhat definite trunk; joints nearly orbicular, 6 to 25 cm. in diameter, thickish, velvety- i , h, ve y-tomentose, dull grayish green; leaves subulate, caducous, 4 to 6 cm. long, green with reddish tips; areoles large, filled with numerous brown glochids; flowers OPUNTIA. 123 yellow to orange, 4 to 5 cm. long including the ovary; petals obovate, 2 to 2.5 cm. long; filaments greenish white, short, 1 cm. long; style 1.5 cm. long, thick, bulbous just above the base; stigma- lobes 5, deep green; ovary globular, 1.5 cm. in diameter, umbilicate, with large areoles; fruit, accord- ing to field observation of Dr. Griffiths, bright red. Type locality: About Presidio del Norte, on the Rio Grande. Distribution: Texas and northern Mexico. This species seems much less common than O. microdasys, with which it is often con- fused. The joints are gray or bluish green, and the glochids are brown. It does fairly well under greenhouse conditions. Illustration: Rep. Mo. Bot. Gard. 20: pl. 3; Carnegie Inst. Wash. 269: pl. 11, f. 94. Figure 153 is from a photograph of a plant brought from Mexico for the New York Botanical Garden in 1896 by Mrs. N. L. Britton. Along the coastal plain of Lower California. Fic. 154.—Opuntia pyenantha. 113. Opuntia pycnantha Engelmann in Coulter, Contr. U. S. Nat. Herb. 3: 423. 1896. Contr. U. S. Nat. Herb. 3: 424. 1896. m. high; joints oblong to orbicular, Opuntia pycnantha margaritana Coulter, Often low and creeping, but sometimes forming a clump 2 d to oF often 20 cm. long, puberulent or papillose, usually nearly hidden by the thick mass of spines; areoles i i d the lower part with 8 large and closely set, the upper part filled with yellow or brown glochids, an lowe to 12 yellow or brown reflexed spines 2 to 3 cm. long; leaves and flowers unknown; fruit 4 cm. long, very spiny; seeds 2 cm. broad, very thick. Type locality: Magdalena Bay, Lower California. Distribution: Southern Lower California. ; _ Coulter’s variety margaritana is known only from Margarita Island, while the species proper is known only from an adjacent island, Magdalena. They differ on in the cour of their spines and glochids. Both have been in cultivation in New Yor yé ington, but are not well suited for indoor plants. This species grows in one of the driest parts 0 is no surface water and where there is no rain som Figure 154 is from a photograph taken by Dr. lena Island, Lower California, in 1911. f Lower California on islands where there etimes for five or six years. Rose near Santa Maria Bay, Magda- 124 THE CACTACEAE. 114. Opuntia comonduensis (Coulter) Britton and Rose, Smiths. Mise. Coll. 50: 519. 1908. Opuntia angustata comonduensis Coulter, Contr. U. S. Nat. Herb. 3: 425. 1896. Low, spreading plants, sometimes 2 dm. high and forming broad clumps; joints obovate to orbicular, 12 to 15 cm. long, softly pubescent; areoles large, filled with brown wool and yellow glo- chids; lower areoles spineless, the upper ones bearing 1 or 2, rarely 3, or on old stems as many as 10, slender spines, 3 to 5 cm. long or longer, yellow; flowers, including ovary, 6 cm. long, yellow; fruit purple, 4 cm. long, spineless; seeds 4 to 4.5 mm. broad, thick. Type locality: Comondu, Lower California. Distribution: Southern Lower California. As was pointed out by Mrs. K. Brandegee, this plant is not closely related to Opuntia angustata. Fic. 155.—Opuntia comonduensis. This species has long been known only from herbarium specimens collected by Mr. Brandegee in 1889. In 1911 Dr. Rose collected considerable material both near the town of San José and on Carmen Island which has since been in cultivation in the New York Botanical Garden and in Washington. The above description is based largely on this collection. This species sometimes grows with O. tapona, in fact being confused in the original material ; except for 1ts pubescent joints, they are not readily distinguished. Figure 155 is from a photograph by Mr. T. W. Smillie of a plant collected by Mr. E. W. Nelson and Mr. E. A. Goldman in Lower California in 1906. OPUNTIA. 125 Fic. 156.—Opuntia inamoena. A single plant: Photograph by P. H. Dorsett. Series 6. INAMOENAE. A single, prostrate or depressed, usually spineless, light-green Brazilian species. 115. Opuntia inamoena Schumann in Martius, Fl. Bras. 4’: 306. 1890. Opuntia quipa Weber, Dict. Hort. Bois 894. 1898. Usually low, often prostrate, forming clumps 2 to 10 dm. broad, or sometimes in sheltered situations 6 cm. high and forming dense, extensive thickets; roots fibrous; joints bluish green, when young bright green, orbicular to oblong, 8 to 16 cm. long, usually quite thick, sometimes 3 cm. thick, usually quite spineless; leaves minute, 2 mm. long; areoles small, when young filled with numerous yellow- ish-brown glochids; glochids unequal, spreading, easily becoming de- tached; flowers small, brick-red; petals spreading; filaments orange, style yellow; stigma-lobes pale green; fruit globular, yellowish, 2.5 to 3 cm. in diameter. Type locality: Schumann cites Rio de Janeiro in original Fic. 157-—Opuntia inamoena. description. X0.66. Distribution: Pernambuco, Bahia, and Minas Geraes, Brazil. This plant is known as quipa in Bahia, Brazil. This species is very common in all the dry part of Bahia and, although abundant and mostly spineless, is avoided by all kinds of grazing animals, even when the country is devoid of other suitable forage. It has been suggested that the plant may be bitter, or that the glochids are troublesome; the glochids, however, are usually wanting on old joints. The plant rarely develops acicular spines up to 3 cm. long on some joints, as show n by specimens collected by Dr. Rose and Mr. Russell near Machado Portello, Brazil. 1 Figure 156 is from a photograph taken by Mr. P. H. Dorsett near Jonze OTe eae 1914; figure 157 is from a plant collected by Dr. Rose near Machado Portello, bahia, Brazil, in 1915. 126 THE CACTACEAE. Series 7. TORTISPINAE. Prostrate or spreading plants rarely erect, with mostly rather small, persistent, scarcely tuber- culate, orbicular or oval joints, and large flowers; natives of the eastern, central, and southern United States. Plate 21 represents a group of hardy cacti, chiefly species of this series, at the New York Botanical Garden. KEY TO SPECIES. Spines none or only 1 or 2 at an areole. Joints bluish green; at least when young; roots tuber-like. Fruit clavate; joints thin. Fruit about 4.5 cm. long.........0.00 000. e eee eee 116. O. allairet Fruit 5 to 7 cm. long.... 2.0.2.0... 00. ee 116a. O. lata Fruit obovoid; joints turgid............. 0.0.0.0. 2c eee eee 117. O. pollardit Joints green; roots not tuberous. Flowers 8 cm. broad or less. Joints orbicular or little longer than wide.................... 118. O. opuntia Joints oblong, much longer than wide ....................-.. 119. O. macrarthra Flowers 10 to 12 cm. broad........... 0.0.00 eee 120. O. grandiflora Spines mostly 2 or more at an areole. Ovary obconic, 2 to 4 cm. long. Roots tuberous. Joints repand; plant suberect............... 200.000 000 00065 121. O. austrina Joints scarcely 1epand; plants nearly prostrate............... 122. O. macrorhiza Roots not tuberous. Flowers and fruit small... 2.2.0... 0. ee 123. O. plumbea Flowers and fruit large. Spines white to light brown, slender. Seeds acute-margined........... 0.000000 ce eee eee 124. O. tortispina Seeds obtuse-margined. Fruit large, 4 to 5 cm. long; spines light colored.... 125. O. stenochila Fruit small, 2 to 3 cm. long; spines brown......... 126. O. delicata Spines dark brown, stout..............00...0..00 00005. 127. O. fuscoatra Fic. 158.— Opuntia Ovary narrowly subcylindric, 5 to 6 cm. long..................... 127a. O. macateet allairei. 0.66. 116. Opuntia allairei Griffiths, Rep. Mo. Bot. Gard. 20: 83.. 1909. A low, spreading, tuberous-rooted, prostrate plant, with some of the joints ascending; joints bluish green, obovate, usually 1o to 15 cm. long, originally described as even longer, with or without spines; spines, if present, 1 to 3, yellowish brown, 2.5 cm. long or less, slender but a little flattened; glochids numerous, especially abundant at very old areoles, yellow; leaves 6 to 8 mm. long; flowers 6 to 7 cm. broad, yellow with a red center; fruit 4 to 5 cm. long, dark red. Type locality: Mouth of Trinity River, Texas. Distribution: Southern Texas and western Louisiana. This species is perhaps nearest O. macror- hiza, but differs in the usual. absence of spines and in differently colored joints. . Illustrations: Rep. Mo. Bot. Gard. 20: pl. 2, f. 2; pl. 5; pl. 12, in part. Figure 158 is copied from the second illus- tration above cited. 116a. Opuntia lata Small, Journ. N. Y.£Bot. Gard. 20:26. 1919. (See Appendix, p. 220.) Fic. 159.—Opuntia pollardii. Xo.4. 117. Opuntia pollardii Britton and Rose, Smiths. Misc. Coll. 50: 523. 1908. Prostrate, tuberiferous, related to Opuntia opuntia; young joints bluish green, glaucous, 5 to 16 cm. long, 1 to 2 cm. thick; areoles 1.5 to 3 cm. apart, bearing numerous yellow glochids 2 to 3 cm. TON AND ROSE RIT B ‘Uapiesry [voluejOg YIOK MON dy} JO spuNnolsds snososeqiay ayy Ul ‘vr/sip1o7 vYUNY() AYsou ‘sivad ATYoIad Apsey jo dnossy ee OPUNTIA. 127 long, those toward the top of the joint each with a single stout, stiff, pungent spine 2.5 to 4 cm. long; fruit short-obovoid, 2.5 cm. long, 1.5 cm. thick, with a few areoles bearing tufts of brownish wool but no spines and but few glochids; flowers yellow, 6 to 8 cm. broad; sepals deltoid to rhom- bic; fruit 2.5 to 4 cm. long; seeds 4 to 6 mm. wide, much thicker than those of Opuntia opuntia. Type locality: Biloxi, Harrison County, Mississippi. Distribution: Coastal plain, Church Island, North Carolina, to northern Florida, Ala- bama, and Mississippi. Figure 159 is from a photograph of fruiting joints collected by A. H. Howell on Petit Bois Island, Alabama. 118. Opuntia opuntia (Linnaeus) Karsten, Deutsch. Fl. 888. 1882. Cactus opuntia Linnaeus, Sp. Pl. 468. 1753. Cactus compressus Salisbury, Prodr. 348. 1796. Cactus opuntia nana De Candolle, Pl. Succ. Hist. 2: pl. 138. [A]. 1799. Cactus humifusus Rafinesque, Ann. Nat. 15. 1820. Opuntia vulgaris major Salm-Dyck, Observ. Bot. 3:9. 1822. Opuntia vulgaris media* Salm-Dyck, Observ. Bot. 3:9. 1822. Opuntia humifusa Rafinesque, Med. Fl. U. S. 2: 247. 1830. »Opuntia mesacantha Rafinesque, Bull. Bot. Seringe 216. 1830. > Opuntia caespitosa Rafinesque, Bull. Bot. Seringe 216. 1830. Opuntia intermedia Salm-Dyck, Hort. Dyck. 364. 1834.. Opuntia nana Visiani, Fl. Dalmatica 3: 143. 1852. > Opuntia rafinesqueit Engelmann, Proc. Amer. Acad. 3: 295. 1856. Opuntia rafinesquei microsperma Engelmann, Proc. Amer. Acad. 3: 295. 1856. Opuntia rafinesqueit minor Engelmann and Bigelow, Pac. R. Rep. 4:55. 1856. Opuntia vulgaris rafinesquet Gray, Man. Bot. ed. 2. 136. 1856. Opuntia rafinesquet arkansana Riimpler in Forster, Handb. Cact. ed. 2. 922. 1885. Opuntia mesacantha microsperma Coulter, Contr. U. S. Nat. Herb. 3: 429. 1896. Opuntia mesacantha parva Coulter, Contr. U. S. Nat. Herb. 3: 429. 1896. Opuntia vulgaris nana Schumann, Gesamtb. Kakteen 715. 1898. Opuntia humifusa microsperma Heller, Cat. N. Amer. Pl. ed. 2. 8. 1900. Opuntia humifusa parva Heller, Cat. N. Amer. Pl. ed. 2. 8. 1900. Low, spreading plants, sometimes ascending, with fibrous roots; joints orbicular to oblong, 3 to 13 cm. long, rarely longer, thick, dark green; areoles usually far apart; leaves subulate, appressed or spreading, 4 to 8 mm. long, early deciduous; spines often wanting, when present usually one from an areole, rarely two, 5 cm. long or less, brownish or sometimes nearly white, but on seedlings 5 to 12; glochids numerous, yellow to dark brown; flowers usually bright yellow, sometimes with reddish centers, 5 to 8.5 cm. broad; petals 8 to 10, widely spreading; filaments yellow; stigma-lobes white; fruit obovoid to oblong, red, juicy, 2.5 to 5 cm. long, edible; seeds 4 to 5 mm. broad. Type locality: In Virginia. oo, . Distribution: Sandy and rocky places from Massachusetts to Virginia, the mountains of Georgia and central Alabama extending north into southern Ontario, Canada (Point Pelee), west in isolated colonies to northern Illinois, eastern Missouri and Tennessee, and long established in the mountains of northern Italy and Switzerland. a Linnaeus undoubtedly had two species in his Cactus opuntia, one being the low Virginia plant commonly known as O. vulgaris, and the other a tall, branching plant figured by Bauhin (p. 154). Upon Bauhin’s illustration Miller based his Opuntia vulgaris, a name which was afterwards transferred to the low, procumbent plant of the eastern United States. For this reason Burkill (Rec. Bot. Surv. India 4: 288. 191 1) would displace the name O. vulgaris and take up the name O. nana. We are quite in agreement with him as to the O. vulgaris Miller, but we retain for the low plant the specific name opuntia Linnaeus. The tall species is O. monacantha, which we now call O. vulgaris, as suggested by Burkill. It is to be noted that the southern Atlantic coast specimens of Opuntia opuntia have yellow or greenish-yellow glochids, while those in its northern and western range have brown glochids. Its southwestern limit is uncertain. It probably does not extend to Texas, although two varieties have been reported from there; these we are disposed to treat as species under the names Opuntia macrorhiza and O. grandiflora. It is reported from *Opuntia vulgaris minor (Labouret, Monogr. Cact. 476. 1853) was doubtless intended for this name. metimes spelled rafinesquiana. 128 THE CACTACEAE. eastern Kansas, but the plants found there are not like those found in Illinois and Indiana, having more spines and a glaucous bloom, and are tuberous-rooted, and these are referred by us to O. macrorhiza. ‘The published western varieties of O. humifusa are specifically distinct; we have referred them to O. tortispina. Some of the joints of this plant elongate under shade conditions, reaching at least 2.5 dm. in length and not more than 5 cm. in width. Opuntia arkansana (Hirscht, Monatsschr. Kakteenk. 8: 115. 1898) has not been formally described. The name should doubtless be referred here. Opuntia prostrata Monville and Lemaire (Forster, Handb. Cact. 478. 1846) was given only as a synonym of O. intermedia, while O. intermedia prostrata Salm-Dyck (Cact. Hort. Dyck 1849. 69. 1850) was based on O. prostrata. O. rafinesquei parva Haage and Schmidt (Verzeichnis Blumenzwiebeln 1915: 29. 1915) is a new name for O. mesacantha parva Coulter. Under Opuntia vulgaris Michaele Gandoger in his Flora Europea (9: 145. 1886) has proposed the following new binomials: O. recedens, O. morisi1, O. cycloidea, O. inaequalis, O. ligustica, and O. mediterranea. The following varieties cited under O. humifusa are in the trade: cymochila, greenet, macrorhiza, oplocarpa and stenochila (Stand. Cycl. Hort. Bailey 4: 2363. 1916.) Fic. 160.—Opuntia opuntia in its natural surroundings on Staten Island, New York. [llustrations: Mlustr. Fl. 2: f. 2527; ed. 2. arf. 2986; Curtis’s Bot. Mag. so: pl. 2393; Loudon, Encycl. Pl. ed. 3. f. 6884, the last two as Cactus opuntia; De Candolle, Pl. Succ. Hist. 2: pl. 138 [A]; DeTussac, Fl. Antill. 2: pl. 30, the last two as Cactus opuntia nana. Dept. Agr. N. S. W. Misc. Publ. 253: pl. [1], f. 2; Engler and Prantl, Pflanzenfam. 3°°: f. 57, G; Forster, Handb. Cact. ed. 2. f. 12; Pac. R. Rep. 4: pl.1o, f. 1, 2; 4: pl. 23, f. 13; Schumann, Gesamtb. Kakteen Nachtr. f. 1, all as Opuntia vulgaris. Standard Cycl. Hort. Bailey 4: f. 2602, in part as Opuntia humifusa. Amer. Entom. Bot. 2: f. 160 ; Amer. Gar- den 11: 462; Curtis’s Bot. Mag. 115: pl. 7041; Dict. Gard. Nicholson 2: f. 756; Fl. Serr. 22: pl. 2328; Forster, Handb. Cact. ed. 2. f. 2; Gard. Mag. 4: 280; Gartenflora 24: 218; Lemaire, Cact. f. 9; Meehan’s Monthly 2: pl. 6; 10: 121; Pac. R. Rep. 4: pl. 10, f. 4, 5; pl. 23, f. 73 8; Ruimpler, Sukkulenten f. 125; W. Watson, Cact. Cult. f. 84, all as Opuntia rafinesquet; Pac. R. Rep. 4: pl. 11, f. 1, as Opuntia rafinesquei minor; Forster, Handb. BRITTON AND ROSE 5 PLATE Xxil A MOEN B CO M. E. Eaton del. 1. Joints of Opuntia microdasys. 2. Flowering joint of Opuntia macrarthra. 5 3. Fruit of Opuntia macrarthra. 4. Seed of same. Flowering joint of Opuntia opuntia. (All natural size except 4.) x 120. Opuntia grandiflora Engelmann, Proc. Amer. Acad. 3: 295. OPUNTIA. 129 Cact. ed. 2. f. 126, as Opuntia rafinesquei arkansana; Monatsschr. Kakteenk. 14: 124, as Opuntia vulgaris nana; Miller, Fig. Pl. Gard. Dict. 2: pl. 191, as Opuntia folio minori, etc., Dict. Hort. Bois f. 638; Rev. Hort. 40: f. 10, 11; 66: f. 59, all as Opuntia rafinesquiana., Wiener Illustr. Gartenz. 10: f. 112, as Opuntia rafinesquiana arkansana. Plate xxl, figure 5, represents a flowering joint of the plant which grows naturally on schistose rocks in the New York Botanical Garden. Figure 160 is from a photograph of the plant growing on sand dunes at Crooke’s Point, Staten Island, New York, taken by Howard H. Cleaves in 1914. 119. Opuntia macrarthra Gibbes, Proc. Elliott Soc. Nat. Hist. 1: 273. 1859. Stems prostrate or ascending; joints narrowly oblong to obovate, 12 to 35 cm. long, thick, pale green, somewhat shining; leaves subulate, 10 mm. long, green, sometimes with purplish tips; areoles large, 2 to 3 cm. apart, filled with brown wool ; spines wanting, or sometimes 1, up to 2.5 cm. long; glochids when present yellow; flowers not known; fruit narrowly obovoid, red, fleshy, 4 to 6 cm. long. Type locality: Near Charleston, South Carolina. Distribution: Coast of South Carolina. This species, long overlooked, has recently been col- lected by Dr. J. K. Small in the vicinity of the type locality. This is doubtless one of the species to which Elliott called attention and which he said he expected to publish, but never did.* The original description long remained unnoticed in the Proceedings of the Elliott Society of Natural History; it is as follows: “The second, which we will éall Opuntia macrarthra, falls under the same section with the preceding, and seems to be near Opuntia angustata, of Engelmann, from the west of the Rio Grande; a prostrate species, joints from ten to fifteen inches long and three inches wide, one-third of an inch thick; no spines, fruit two and a half inches long, slender, clavate.”’ Plate xv, figure 3, represents a fruiting joint collected by Dr. Small on James Island, South Carolina, in 1916; plate xxu, figure 2, represents a flowering joint of the plant collected by Dr. Small on the Isle of Palms, near Charles- ton, South Carolina, in 1916; figure 3 shows a fruit of the same plant and figure 4 a seed, enlarged. moe Fics. 161, 162.—Opuntia grandiflora. Opuntia rafinesquei grandiflora Engelmann, Pac. R. Rep. 4:55. 1856. Opuntia mesacantha grandiflora Coulter, Contr. U.S. Nat. Herb. 3: 429. 1896. _ Low, with somewhat ascending branches; joints 12.5 to 15 cm. long; spines usually wanting; flowers very large, 11 to 12.5 cm. broad, yellow w broad; fruit elongated, 6 cm. long. Type locality: On the Brazos, Texas. Distribution: Eastern Texas. described thi Although Dr. Engelmann formally describe IS as — “ probably only a southern variety of O. rafinesquet.”” A little later he actually used the name as a variety. The position of the plant is still uncertain ; if specimens co ected y Mr. Wm. R. Maxon at Victoria, Texas, and by Mr. C. V. Piper at Dallas, Texas, belong here, as they appear to, we believe it to be a distinct species. Illustrations: Pac. R. Rep. 4: pl. 11, f. 2, 3, as Opuntia rafine Figures 161 and 162 are copied from the illustrations above cited. . . os t of the *Cactus opuntia. ‘It is probable that there are now three distinct species on the sea coast 0 covered under. this name.”’ Elliott, A Sketch of the Botany of South Carolina and Georgia, T+ 537- areoles 2.5 cm. apart; ith a red center; petals as a species, he introduced it as nesquet grandiflora. Southern States 130 * THE CACTACEAE. 121. Opuntia austrina Small, Fl. Southeast. U. S. 816. 1903. Opuntia youngii C. Z. Nelson, Chicago Examiner. June 13, 1915. fusiform or tuberous, resembling sweet potatoes, often 4 to 6 cm. in diameter, 5 to 15 em. long: stems erect or ascending; joints narrowly obovate to oblong-obovate, thick, ae perin late, repand, bright green, 5 to 12 cm. long; leaves soon deciduous, less than 10 wre ong glo ids yellowish; spines usually on the upper half and margin of the joint, often 2, wre —_ I ° - om an areole, whitish or pinkish, darker at base and apex, twisted, sometimes wan ing; une Ss rig yellow, 6 to 7 cm. broad; petals cuneate, truncate or retuse at apex, mucronate; fruit 2.5 to 3 om. ong. Fic. 163.—Opuntia austrina. Xo.5. Type locality: Miami, Florida. Distribution: Southern Florida. Opuntia youngii C. Z. Nelson, published in a Chicago newspaper, we have referred here, after studying a specimen sent by the author. Opuntia spinalba Rafinesque (Atl. Journ. 1: 147. 1832) was described as from the keys of Florida, and answers in some respects to O. austrina; but it is very unlikely that any plants of the region inhabited by austrina were known to botanists as early as 1832. Figure 163 represents a plant collected by Dr. Small at the type locality in 1go1. 122. Opuntia macrorhiza Engelmann, Bost. Journ. Nat. Hist. 6: 206. 1850. Opuntia fusiformis Engelmann and Bigelow, Proc. Amer. Acad. 3: 297. 1856. Opuntia rafinesquei fusiformis Engelmann, Pac. R. Rep. 4: 43. 1856. Opuntia mesacantha macrorhiza Coulter, Contr. U. S. Nat. Herb. 3: 430. 1896. Opuntia xanthoglochia Griffiths, Rep. Mo. Bot. Gard. 21: 166. I9gI10, Opuntia roseana Mackensen, Bull. Torr. Club 38: 142. 1911. Plant low, usually nearly prostrate, forming a clump 1 meter in diameter, from a cluster of tuber-like roots, these sometimes 5 to 7. 5 cm. in diameter; joints orbicular to obovate, dull green, 5 to 16 cm. long, about 1 cm. thick; leaves subulate, 4 to 10 mm. long; areoles rather large, the lower ones and sometimes all of them spineless; glochids numerous, yellow or brown; spines, when present, 1 to 4, unequal, yellow to brown, the longest 2.5 cm. long; flower yellow, with a reddish or purplish center, 7 to 8 cm. broad; fruit narrowly obovoid, 3.5 to 5 cm. long, purple or red, with a depressed umbilicus, not edible; seeds 5 mm. in diameter, with broad margins. Type locality: Rocky places on the Upper Guadalupe, Texas. Distribution: Missouri and Kansas to Texas. Opuntia seguina C. Z. Nelson (Galesburg Register, July 20, 1915), published in a news- paper, and said to have come from San Antonio, Texas, seems to be one of the To rlispinae, OPUNTIA. 131 and is probably referable to O. macrorhiza. Through the kindness of Mr. N elson, we have seen a joint of this species. Opuntia bulbosa Engelmann (Proc. Amer. Acad. 3: 297. 1856) was used by Engelmann for O. fusiformis, but never described. Opuntia macrorhiza, originally described by Dr. Engelmann as a species, was afterwards (Proc. Amer. Acad. 3: 296. 1856) proposed as a subspecies but not formally indicated, so that the reference O. rafinesquei macrorhiza Coulter (Contr. U. S. Nat. Herb. 3: 430. 1896) is the proper designation if it is used as a variety. Illustrations: Cact. Mex. Bound. pl. 69; Férster, Handb. Cact. ed. 2. f. 1 I, 127; Pac. R. Rep. 4: pl. 12, f. 7, 8; pl. 23, f. 6; Suppl. Dict. Gard. Nicholson f. 606; W. Watson, Cact. Cult. f. 82, 83; Rep. Mo. Bot. Gard. 21: pl. 20, in part, this last as Opuntia xanthoglochia; Addisonia 1: pl. 19. Plate xiv, figure 5, represents a flowering joint of the plant collected at Irving, Dallas County, Texas, by Albert Ruth in 1912. 123. Opuntia plumbea Rose, Smiths. Mise. Coll. 50: 524. 1908. Plant low, creeping, 10 cm. high, 20 to 30 cm. broad, few jointed; joints small, nearly orbicular, 3 to 5 cm. in diameter, of a dull lead-color, the surface some- what wrinkled in dead specimens; areoles rather large for the size of the joints; spines pale brownish, slender, usually porrect, often 3 cm. long, mostly 2 in number, rarely as many as 4, sometimes one or even wanting; flowers very small, ted; ovary naked; fruit 1.5 to 2 cm. long with a few small areoles and these simply woolly ; seeds small, rather turgid, smooth, and with a shallow obtuse margin. Type locality: San Carlos Indian Reservation, Arizona. Fic. 164.—Opuntia plumbea. Distribution: Arizona. _ . : i This is a peculiar little opuntia with very small joints and fruits. It is known only from the original collections made by Mr. F. V. Coville in 1904. Figure 164 is from a photograph of the type specimen. 124. Opuntia tortispina Engelmann, Proc. Amer. Acad. 3: 293. 1856. Opuntia tortisperma Engelmann, Pac. R. Rep. 4: pl. 23, f.1 to 5. 1856. Opuntia cymochila Engelmann, Proc. Amer. Acad. 3: 295. 3856. 1aK6 Opuntia rafinesquei cymochila Engelmann, Proc. Amer. Aca ; 3: 295. ; 36 - 442 Opuntia rafinesquei cycmochila montana Engelmann and Bige om, Pac. R. R P . 42 42. Opuntia mesacantha cymochila Coulter, Contr. U. S. Nat. Her . 3? 430. 3 89 . Opuntia mesacantha greenei Coulter, Contr. U. S. Nat. Herb. 3: 431. I 96. ‘ Opuntia mesacantha oplocarpa Coulter, Contr. U. S. Nat. Herb. 3: : 43 oe 89 . Opuntia greenei Engelmann in Britton and Rose, Smiths. ae oll. Se : 52: 4 (?) Opuntia sanguinocula Griffiths, Proc. Biol. Soc. Washington 27: 26. 1914. orbicular to obovate, 15 to 20 cm. long; areoles 1.5 to 3 Cm. apart; spines several, often 6 to 8, the upper and longer ones 3 to 6 cm. long, citer white, yer lowish, or brown; on the upper areoles one spine erect, the others spreading 7 om, long, 2 va ones deflexed; flowers sulphur-yellow, 6 to 7.5 cm. broad; fruit rather large, t he hilum cm. broad; seeds 4 to 6 mm. broad, thick, regular, with a slight indentation a . Type locality: On the Camanchica Plains near the Oe eas Distribution: Wisconsin to South Dakota, Texas, Kansas, Colorado, 1856. 1908. Prostrate and creeping; joints ascending, and New Mexico. 132 THE CACTACEAE. This has long remained one of our least-understood species. We believe now that it has a wide range, and that it has been referred heretofore to several species. Opuntia cymochila does not seem to differ from it, and the two published varieties of Opuntia mesacantha, geographically out of harmony with that species, doubtless belong here. Opuntia oplocarpa Engelmann (Coulter, Contr. U. S. Nat. Herb. 3: 431. 1896) was published only as a synonym. Opuntia rafinesquei greenei (Cat. Darrah Succ. Manchester 58. 1908) is a catalogue name. The plant is hardy at New York, flowering profusely, and also at Buck Hill Falls, eastern Pennsylvania. Illustrations: Pac. R. Rep. 4: pl. 12, f. 1 to 3; pl. 23, f. 10 to 12; Rev. Hort. Belg. 40: after 186, all as Opuntia cymochila; Ilustr. Fl. 2:f. 2528; ed. 2. 2: f. 2987; Pac. R. Rep. 4: pl. 10, f. 3; Stand. Cycl. Hort. Bailey 4:f. 2602, in part, these as Opuntia humifusa. Pac. R. Rep. 4: pl. 8, f. 2, 3; pl. 23, f. 1 to 5, as O. tortisperma. Illustr. Fl.. 2: f. 2529; ed. 2. 2:f. 2988. Plate xv, figure 4, represents a flowering and fruiting joint of a plant from Colorado, grown at the New York Botanical Garden. 125. Opuntia stenochila Engelmann, Proc. Amer. Acad. 3: 296. 1856.* Opuntia mesacantha stenochila Coulter, Contr. U. S. Nat. Herb. 3: 430. 1896. Prostrate; joints obovate, rocm.long by 7.5 cm. broad; leaves small, 4 to 6 mm. long; spines usually 2, sometimes 3, spreading, 1 long (2.5 to 3 cm. long), and 1 or 2 short and reflexed, usually light-colored, sometimes nearly white; glo- chids brown; flowers yellow, 6 cm. long; fruit very juicy, 4 to 5 cm. long or more, attenuate at base; seeds thick, quite regular, with very narrow obtuse edges. Type locality: Canyon of Zuni, New Mexico. Distribution: Western New Mexico and Arizona. This species has not been well understood. It has usually passed as a variety of the common species of the eastern Mississippi Valley States, but it grows in a very different region. It is the common low, spreading Opuntia of northwestern New Mexico and j,5, 165 emt eee To; Arizona. : , 166. . . 167.—Joint. Illustrations: Pac. R. Rep. 4: pl. 12, f. 4 to 6; pl. 23, f. 9. Figures 165, 166, and 167 are copied from the first illustration above cited. 167 126. Opuntia delicata Rose, Contr. U. S. Nat. Herb. 13: 310. 1911. A small, procumbent plant with rather thin, ovate, bluish, slightly glaucous joints, often only 4 to 9 cm. in diameter; areoles prominent, bearing conspicuous brown glochids; lower areoles spineless, the upper ones bearing 1 or 2 very slender brownish spines, the longer one 3 to 4 cm. long; flowers yellow, 5 cm. long, 5 to 6 cm. broad; fruit oblong, spineless, 2 to 3 cm. long; seeds small, about 4 mm. in diameter, nearly smooth. Type locality: Calabasas, Arizona. Distribution: Southeastern Arizona. Figure 168 is from a photograph of the type plant. *Although formally published as a species, Engelmann states that it is p cie and hence € , a form or subspe d hence Coulter (Contr. U. S. Nat. Herb. 3: 430. 1896) uses the synonym O. rafinesquei stenochila Engelmann, » BRITTON AND ROSE M. E. Eaton del. 1. Flowering joint of Opuntia fuscoatra. Ke 2. Upper part of joint of Opuntia sulphurea. Joint of Opuntia tenuispina. (All natural size.) PLATE XxIiII OPUNTIA. 133 Fic. 168.—Opuntia delicata. 7 127, Opuntia fuscoatra Engelmann, Proc. Amer. Acad. 3: 297. 1856. Diffuse prostrate plants; joints orbicular to obovate, somewhat tuberculate, 5 to 8 cm. long, areoles 12 to 20 mm. apart, very large for the group; spines single or in twos or threes, one rather stout, sometimes a little flattened, 2.5 to 3 cm. long, yellow to dark brown or even nearly black; usually from the lower areoles; glochids numerous, brown; flowers 7.5 cm. broad, yellow, petals very broad; stigma-lobes 5; ovary 2.5 cm. long, slender; fruit 4 to 5 cm. long, red; seeds 4 mm. broad. Type locality: Sterile places of prairies west of Houston, Texas. Distribution: Eastern Texas. Illustrations: Pac. R. Rep. 4: pl. 11, f. 4. Plate xxum1, figure 1, represents a flowering joint of the plant collected by W. I,. Mc- Atee at Rockport, Texas, in 1911. 127 a. Opuntia macateei sp. nov. (See Appendix, p. 221.) OPUNTIA RUBIFLORA Griffiths, Bull. Torr. Club 43: 529. 1916. Described as a spreading plant 3 to 4.5 dm. high and a meter broad, with obovate, green joints 12 to 18 cm. long, few white spines up to 5 cm. long with brown or straw- colored bases, and pink flowers. The species is based on cuttings received from European collections, and its origin is unknown. We have received a similar if not identical plant from Haage and Schmidt of Erfurt, Germany, and we suspect it to be a hybrid, having one of the Tortispinae as one of its parents. The specific name rubiflora was used by Davidson a few months earlier than by Griffiths for another plant. Series 8. SULPHUREAE. k, flat, tuberculate joints; fruit small, nearly globular. Low or prostrate species, with rather thic 1 Three species, natives of central and southern South America. Kry TO SPECIES. Flowers ye he Yellow, 128. O. sulphurea eeunes Stout, Subulate..... 0... cc cece eee eee rere rss: 129. O. soehrensii dines s FE Pr . U, soehren: I ender, acicular..............00005 02055 130. O. microdisca 134 THE CACTACEAE. 128. Opuntia sulphurea G. Don in Loudon, Hort. Brit. 196. 1830. Opuntia maculacantha Forster, Handb. Gartenz. 17: 166. 1861. Opuntia pampeana Spegazzini, Contr. Fl. Ventana 30. 1896. Opuntia vulpina Weber, Dict. Hort. Bois 895. 1898. Plants low and spreading, forming broad clumps 1 to 2 meters in diameter, 3 dm. high or less; joints flattened, oblong to obovate, 12 to 25 cm. long, thick, strongly tuberculate, usually green but sometimes purplish; terminal joints easily detached; leaves conic, about 2 mm. long; spines 2 to 8, generally straight but sometimes curved and twisted, spreading, 3 to 10 cm. long, brownish to red, but sometimes quite pale at first; flowers about 4 cm. long, yellow; fruit with a deep umbilicus, short, about 1 cm. long. Type locality: Cited as Chile, but doubtless wrong. Distribution: Dry parts of western Argentina; recorded also from Chile, and perhaps occurring in Bolivia. This species was not seen in Chile by Dr. Rose, and we are doubtful in considering the Bolivian material to be O. sulphurea; the joints, as shown by Dr. Rose’s specimens, col- lected at La Paz (No. 18860), while thick, are not conspicuously tuberculate; the spines are rather short and stiff, white at first, but somewhat yellowish or horn-colored in age. The name Cactus sulphureus Gillies was published by G. Don at the place cited above as a synonym of this species. Opuntia maculacantha was first described from specimens from Buenos Aires, which had doubtless been sent down from the desert regions to the west or northwest. Schumann in his Monograph referred this species to Mexico, but in his Nachtrag corrects this state- ment. Dr. Weber, with whom we are in agreement, refers the species to O. sulphurea. It is the only species we know with such large tubercles on the joints. Several varieties of this species, some of which have been described, are given, such as laevior, major, minor, and pallidior. Here probably belongs Opuntia sericea G. Don (Salm-Dyck, Hort. Dyck. 363. 1834), also reported from Chile, but doubtless from Argentina. Cactus sericeus Gillies (Loudon, Hort. Brit. 196. 1830) isthesame. There are several varieties of O. sericea which we would put with it: longispina Salm-Dyck (Hort. Dyck. 363. 1834); coerulea Forbes (Hort. Tour Germ. 159. 1837) which is probably O. coerulea Gillies (Pfeiffer, Enum. Cact. 1 55- 1837); maelentt Salm-Dyck (Cact. Hort. Dyck. 1844. 46. 1845) which is O. maelenii (Salm-Dyck, Cact. Hort. Dyck. 1844. 46. 1845). Opuntia tweediei (Schumann, Gesamtb. Kakteen 745. 1898) is given as a synonym of this species by Schumann. Opuntia albisetosa Hildmann, a name only, belongs here according to Hirscht (Monatsschr. Kakteenk. 10: 48. 1900). Illustrations: Blithende Kakteen 3: pl. 136; Monatsschr. Kakteenk. 8: 121; Schumann, Gesamtb. Kakteen f. 106, all as Opuntia maculacantha. Plate xxiu, figure 2, represents a flowering joint of the plant collected by Dr. Rose near Cérdoba, Argentina, in 1915. 129. Opuntia soehrensii sp. nov. Prostrate, in masses usually 1 meter in diameter or less: joints at first erect or ascending, finally prostrate and rooting and forming new colonies, flattened, rather thin, somewhat tuberculate, very spiny, orbicular, 4 to 6 cm. in diameter, often purplish; spines slender, rather variable in color, usually yellow or brown, several from each areole, sometimes as many as eight, the longest ones 5 cm. long, erect; flowers light yellow, 3 cm. long; sepals brown; filaments yellow; style white; stigma-lobes green; fruit naked, 3 cm. long; seeds 3 to 3. 5 mm. broad, ovate, thickish, with narrow margin and roughened sides. Highlands of southern Peru, Bolivia, and northern Argentina. Type collected by Dr. and Mrs. J. N. Rose below Pampa de Arrieros, Peru, August 23, 1914 (No. 18967). This species is very common in its region, but as it is cultivated somewhat for its seeds as well as used as a protection for gardens and yards, its natural distribution is difficult to determine. On the barren hills below La Paz, Bolivia, the species is well established and OPUNTIA. 135 grows as if native; on some of these hills it is the dominant and sometimes exclusive plant. In the same general region, however, one finds the plant about the houses, especially on walls, where it has undoubtedly been planted. At Oruro, Bolivia, it was seen only in the wild state, while at several stations along the railroad between Juliaca and Cuzco, Peru, especially at Combatata and Tinta, Peru, it has been planted on top of many of the mud walls about the yards. On the hills below Pampa de Arrieros, Peru, the species is extremely common and undoubtedly native. The plant is known everywhere by the natives as ayrampo. The seeds are collected in great quantity and dried, and may be bought in the market places, especially in Arequipa. Indeed, there must have been a time when they were shipped by freight, for the name Ayrampo has always appeared on the printed freight classification of the Southern Railroad of Peru. The assistant superintendent of the road, Mr. Brown, states that, so far as he knows, there are few or no shipments made now. One of the places in Peru where Dr. Rose found the plant very abundant is named Ayrampal. | The dry seeds, when placed in water, yield a red substance which is used for coloring jellies and gelatine and, according to some, for coloring wines. In former days the Indians also used this sub- stance in some of their carnival ceremonies. The coloring matter does not come from the seeds themselves, but from the red juice of the fruit which has dried on the surfaces. Figure 169 represents a joint of this species collected by Dr. Rose at Oruro, Bolivia, in 1914. . . . Fic. 169.—Opuntia soehrensii. 130. Opuntia microdisca Weber, Dict. Hort. Bois 896. 1898. X04. Forming small clumps, very much branched, prostrate; joints mostly obovate to oblong, 4 to 8 cm. long, usually much flattened, but sometimes nearly cylindric, grayish green; leaves minute, purple, soon dropping off; areoles numerous, 5 to 6 mm. apart, rather large, when young densely white-felted; spines 10 to 15, white to reddish, unequal, some of the centrals 1.5 to 2.5 cm. long; glochids numerous, yellow; flower-buds red; flowers 2.5 cm. long, bright red; filaments purple; style white; stigma-lobes 6 to 8, short; ovary turbinate, 16 mm. long, bearing numerous areoles sub- tended by narrow red leaves; areoles on ovary densely felted and bristly; fruit red. Type locality: In Catamarca, Argentina. Distribution: Northern Argentina. Schumann refers this species to Platyopuntia, while Weber referred it to Tephrocactus. It evidently belongs to our Sul- phureae, being nearest our O. soehrensii. Our description is drawn chiefly from specimens obtained by J. A. Shafer between Andalgala and Concepcién, Argen- tina, in 1916, supplemented by a living specimen obtained by Dr. Spegazzini in 1915. In Argentina this species also is known as ayrampo. Figure 170 represents a joint of the plant collected by J. A. _Shafer between Andalgala and Concepcién, Argentina, Decem- ber 28, 1916 (No. 24). . . To this relationship may belong the following species: - FG. 170.—Joint of Opuntia micro- OPUNTIA PENICILLIGERA Spegazzini, Anal. Mus. Nac. Buenos Aires“! '7° woe Kon II. 4: 291. 1902. rbicular to broadly obovate, 10 to 12 cm. long, 7 to d, one elongated and 1 to 5 cm. long, the others much marginal areoles, citron-yellow ; Low, nearly prostrate; joints flattened, 0 10 cm. broad, dull green; spines slender, twiste 4 Shorter, all white; glochids brownish; flowers from the lateral an 136 THE CACTACEAE. ovary 3 to 3.5 cm. long, with very many areoles bearing numerous glochids; style thick; stigma- lobes 8 to 10, greenish white; fruit reddish, clavate, 4.5 cm. long, with a depressed umbilicus; seeds small, 3 to 3.5 mm. broad. Type locality: Argentina, between Rio Negro and Rio Colorado. Distribution: Southern Argentina. According to Dr. Spegazzini, this species is not near to any of the known South Ameri- can species, but resembles somewhat the North American species O. microdasys and O. basilaris. We know it only from the description. OPUNTIA CALANTHA Griffiths, Bull. Torr. Club 43: 524. 1916. A low, creeping, prostrate plant 15 cm. high, one meter in diameter; joints obovate, narrowed above and below, inequilateral, 11 cm. long, 4 cm. broad, tuberculate-wrinkled, mostly deep green; areoles 1 to 1.5 mm. long, obovate, at first tawny, turning gray; leaves small, subulate, cuspidate, red. 1 mm. long; glochids yellow; spines 5 to 10, up to 5 mm. long; flowers carmine; fruit globular, 1.5 cm. in diameter. Recorded as probably of South American origin and usually distributed as Opuntia microdisca, but from which it is said to differ very much. ‘The plant is known to us only from the description of cultivated specimens. Series 9. STRIGILES. PN eS The series consists of a single species, native of AN A AYR: Texas. Itis a low, bushy plant with large joints bear- PN NK INS ing many areoles, these close together, each with sev- \ i SNUNA eral acicular, reddish brown spines; the fruit is small. ANN, 7 UK Sy i NA Wee yy “i > 131. Opuntia strigil Engelmann, Proc. Amer. Acad. 3: SAC "Ay 290. 1856. INR Suberect, 6 dm. high; joints orbicular to obovate, 10 to 12.5 cm. 5 Fi mn long; areoles close together, prominent; spines 5 to 8, spreading, many Ks of them appressed to the joint and deflexed, red to reddish brown with t \ lighter tips, the longer ones 2.5 cm.long; glochids numerous; flowers —' Kx, unknown; fruits small, nearly globular, 12 mm. in diameter, trun- cate, red; areoles on fruit very small; seeds 3 mm. broad. Type locality: In crevices of limestone rock, between the Pecos River and El Paso, Texas. Distribution: Texas. A rare plant, first collected by Charles Wright in 1851. Engelmann says in the Mexican Boundary Report that it was also collected by Wright and Bigelow, but there is no mention of it in his report on Bigelow’s plants, nor do we find specimens in the Engelmann herbarium, so that it would appear that this reference to Bigelow was a mistake. Bigelow, it is true, crossed the River Pecos, on which the type was found, but it was well up in New Mexico and not in Texas, where it was crossed by Charles Wright. It was more recently collected by Nealley somewhere in Texas. The place of collection by Wright and the later one by Nealley are very indefinitely indicated on the labels accompanying the specimens. Illustration: Cact. Mex. Bound. pl. 67. Figure 171 is copied from the illustration above cited. Fic. 171.—Opuntia strigil. X0.4. Series 10. SETISPINAE. Bushy or depressed species, with tuberous or thickened roots, broad, flat, thin joints, and elon- gated, acicular, brown spines which fade whitish; their fruits are large and juicy. We recognize six species, natives of the south central and southwestern United States and northern Mexico. They approach the Tortispinae on the one hand and the Phaeacanthae on the other. OPUNTIA. 137 KEY TO SPECIES. Joints elongated...... 0.0.0 ccc cece cence bce bene ent cneeenebenns 132. O. megarhiza Joints obovate to orbicular. Fruit small, 2 cm. long or less.......0..00 00000 ccc cee cece eee ence neeveenees 133. O. ballit Fruit large 2.5 to 6 cm. long. Flowers red to purple... 0.0.0.0... ccc cece cece eee eeeveeeueeunens 134. O. pottsii Flowers yellow. Areoles large, more or less elevated on old joints; joints glaucous, purplish about the FD a0) (cc 135. O. selispina Areoles small; mature joints green throughout. Joints usually orbicular; seeds 5 to 6 mm. broad.............. 000.00. e cee ae 136. O. mackensenti Joints obovate; seeds 4 mm. broad or less..... 0.2.0.0... 00000 c cece eee ee 137. O. tenuispina 132. Opuntia megarhiza Rose, Contr. U. S. Nat. Herb. 10: 126. 1906. Roots long and thickened, sometimes 3 to 6 dm. long, 5 to 6 cm. in diameter; stems low, 2 to 3 dm. high, much branched; lower joints elongated, 2 to 3 dm. long, cuneate below, thin, 3 cm. broad; lateral joints appearing along the margins of the older joints and often, if not always, in the same plane; spines 2 to 4, acicular, 1 to 2.5 cm. long, brown; leaves minute; flowers lemon-yellow, often tinged with rose, 5 cm. broad; petals about 13, obovate, mucronately tipped; stigma-lobes 7, greenish; ovary clavate, 3 cm. long; fruit and seeds unknown. Type locality: Alvarez, Mexico. Distribution: San Luis Potosi, Mexico. This species is not very closely related to the other species of this series, but it is referred here on account of its very slender spines. 133. Opuntia ballii Rose, Contr. U. S. Nat. Herb. 13: 309. IQII. Plants low, spreading; joints obovate, 6 to 10 cm. long, thickish, pale green, glaucous; spines 2 to 4, brownish, a little flattened, usually ascending or erect, the larger ones 4 to 7 cm. long; glochids conspicuous; fruit small, about 2 cm. long, clavate, glaucous, spineless; seeds thick, 3.5 mm. broad. Type locality: Pecos, Reeves County, Texas. Fic. 172.—O. ballii. Part of type. Xo.5- Distribution: Western Texas. Wooton and Standley in their Flora of pendula, but O. ballii grows in a different spines, and different areoles; it grows on the dry mesa beyon Illustrations: Contr. U. S. Nat. Herb. 13: pl. 64. — Figure 172 is copied from the illustration above cited. New Mexico refer this species to Opuntia filt- habitat, has smaller fruit, stouter and erect d Pecos, Texas. 134. Opuntia pottsii Salm-Dyck, Cact. Hort. Dyck. 1849. 236. 1850. Opuntia filipendula Engelmann, Proc. Amer. Acad. 3: 294. 1856. i i i ts 2 to 3 cm. in diameter, Low, spreading plant, 3 dm. high or less, from thickened tuberous roo n di these sometimes moniliform ; joints broadly obovate, 3.5 to 12 cm. long, pa green to bluish arcorrs few, either small or large; spines confined to the upper and margina area es, h of 2, slender, 2 to 4 cm. long, usually white but sometimes purplish; glochids yellow, usually few but so dant; flowers large, 6 to 7 cm. broad, deep purple; ovary slender, 3 to 3.5 cm. long, with only a few Scattered areoles; fruit spineless. t Type locality: Near Chihuahua City, Mexico. F Distribution: Central Chihuahua, Mexico, to Texas and New Mexico. 1 collected by This species was described by Prince Salm-Dyck in 1850 from material co et ‘ 7 John Potts, who was manager of the mint at Chihuahua and who sent many cact to *. Scheer at Kew between 1842 and 1850. No types of his species seem to have been retained. 138 THE CACTACEAE. In 1885 C. G. Pringle again collected this species near Chihuahua City and it was dis- tributed as O. filipendula, and there Coulter leaves Pringle’s specimen (Cont. Nat. Herb. 3:428). Dr. E. Palmer collected an abundance of material in 1908 which enabled us to reestablish O. pottsii, which Coulter omits and Schumann lists under unknown species. If these Chihuahua specimens are the same as the Texas plants, as Coulter believed and as we regard them, then Opuntia filipendula must give place to the older name of Salm- Dyck. Illustrations: Cact. Mex. Bound. pl. 68; Forster, Handb. Cact. ed. 2. f. 10, 131; Suppl. Dict. Gard. Nicholson 2: f. 605; W. Watson, Cact. Cult. f. 81, all as Opuntia filipendula. Figure 173 shows a joint of a plant collected by Dr. Rose in the valley of the Rio Grande below El Paso, Texas, in 1913. 135. Opuntia setispina Engelmann in Salm-Dyck, Cact. Hort. Dyck. 1849. 239. 1850. Stem branching and spreading, sometimes 9 to 12 dm. broad, with some of the branches com- posed of 3 or 4 joints, erect and 6 dm. high; joints deep bluish green, somewhat glaucous, often purplish at the areoles, sometimes more or less tinged with purple throughout, obovate to orbicular, 5 to 15 cm. in diameter; leaves minute, subulate; spines 1 to 6 from an areole, white, 2 to 3 cm. long; glochids yellow, very conspicuous on old joints; flowers yellow; fruit purplish, about 4 cm. long. Z wes meine MS. T= ms Y y, f : y (OT 7 < N be Gm re) Fic. 173.—Opuntia pottsii. Xo.4. Fic. 174.—Opuntia setispina. Xo.4. Type locality: Pine woods in the mountains west of Chihuahua, Mexico (fide Engel- mann, Proc. Amer. Acad. 3: 294. 1856). Distribution: Western Chihuahua, Mexico. - This species has long been known only from the type specimens; but in 1908 Dr. Rose visited western Chihuahua, where this species is quite common; our description is based largely upon the specimens he then collected. Figure 174 represents a joint of the plant collected by Dr. Rose near Mifiaca, Chi- huahua, in 1908. 136. Opuntia mackensenii Rose, Contr. U. S. Nat. Herb. 13: 310. IgIt. Plants low, with thick, tuberous roots, spreading, usually resting on the edges of the joints, but some of the branches often erect; joints orbicular to obovate, 10 to 20 cm. long, rarely broader than long, pale and glaucous when young, deep green when older; areoles small, the lower ones without spines, the upper ones with 1 to 4 spines; spines white or brown, or brown at base and white above, somewhat flattened and twisted, slender, 5 cm. long or less; glochids brown; flowers of medium size, 7 to 8 cm. broad, yellow with a reddish brown center; stigma-lobes 7 to 9, white: fruit spineless, 4 to 6 cm. long, truncate or nearly so at apex, rose-purple: s i on the margin. Pex, purple; seeds suborbicular, 5 to 6 mm. broad, acute OPUNTIA. 139 Type locality: Near Kerrville, Texas. Distribution: Kerr County, Texas. [llustrations: Contr. U. S. Nat. Herb. 13: pl. 67; Plant World 19: 142. f. 1; 143. f. 2, the last as O. macrorhiza. Figure 175 is from a photograph of the type plant from near Kerrville, Texas. Fic. 175.—Opuntia mackensensii. 137. Opuntia tenuispina Engelmann, Proc. Amer. Acad. 3: 294. 1856. Opuntia minor C. Mueller in Walpers, Ann. Bot. 5: 50. 1858. Low and spreading, but becoming 3 dm. high; joints obovate, attenuate at base, 7 to 15 cm. long, light green; leaves very slender, 4 mm. long or less; spines I to 3 from an areole, slender, usual y white but sometimes brownish, 3 to 5 cm. long, the upper spines erect or spreading ; glochids brow n, flowers yellow, 6 to 7.5 cm. broad; ovary with numerous areoles filled with brown wool and brow n glochids; fruit oblong, 2.5 to 4 cm. long, with a deep umbilicus; seeds 4 mm. broad or less, very irregular. Type locality: Sand hills near El Paso, Texas. . cew Mexj Distribution: Southwestern Texas and adjacent parts of Mexico and New Mexico, apparently extending to Arizona. ; . re Engelmann says that this plant grows with O. phaeacantha, but 1s readily distinguished from the latter by its spines and fruit. Cultivated plants and herbarium specimens closely resemble O. phaeacantha. ; _ Illustrations: Cact. Mex. Bound. pl. 75, f. 14; N. Mex. Agr. Exp. Sta. a 78: pI. es Plate xxii, figure 3, represents a joint of the plant collected by Dr. Rose near Paso, Te: i ; 7 ENE TE TOTS Series 11. PHAEACANTHAE. arge, flat, persistent joints, the subulate, usually species nearly white. ‘The series is composed of southwestern United States, northern and Bushy or depressed species, with relatively l stout spines brown at least at the base, or in some about fifteen species, natives of the south central and central Mexico. 140 THE CACTACEAE. KEy TO SPECIES. More or less bushy plants. Joints thin; spines, when present, very long and confined to the upper and middle areoles. Spines dark brown, stout, rigid. Plant pale green to purplish; spines up to 12 cm. long... .........-.02++005- Plant dull dark green; spines 6 cm. long or less... 1.1.1... 2c c ee eee ees Spines pale brown, flexible or subulate. Usually abundantly spiny........ Pere eer ree teen eee eens Usually spineless or some areoles with 1 setaceous deflexed spine............. Joints thick; spines not confined to the upper and middle areoles. Joints relatively small, seldom over 15 cm. broad; plants relatively low. Joints narrowly obovate, about twice as long as Fide..................5.-- Joints broadly obovate to orbicular. Flowers yellow. Spines subulate, brown at least in part. Plant light green... ... ec ete 7 Plant bluish green or grayish green. Plant erect, 2 meters high or less........... 00... c eee eee Plant bushy, rarely over 1 meter high....................004- Plant prostrate... 2... ee ee eee eee ences Spines acicular, nearly white............ 0.0... cece eee eee eee Flowers magenta. ........ 0. ccc ce eee cent e nen eee Joints relatively large, mostly over 15 cm. broad; plants relatively tall. Spines clear brown nearly throughout........... 0.0... . cee ee eee ee eee Spines nearly white above or throughout. Spines with dark brown bases...........0 0.0.0 cece cece tence eee nee Spines whitish throughout............0.00 00. c cece ee eee eee e eens Small creeping plants... 0.0.0.0. ccc eee een eee tence eens 138. Opuntia macrocentra En- gelmann, Proc. Amer. Acad. 3: 292. 1856. Somewhat bushy, with as- cending branches, 6 to 9 dm. high; joints orbicular to oblong, or sometimes broader than long, 10 to 20 cm. long, often bluish or purplish, sometimes spineless but usually bearing spines at the uppermost areoles; spines 1 or 2, rarely 3 together, usually brown- ish or black but sometimes white above, slender, erect or porrect, 4 to 7 cm. long; flowers yellow, often drying red, 7.5 cm. broad; sepals ovate, acuminate; ovary with few areoles, these bearing brown glochids; filaments very short; fruit 3 to 6 cm. long, pur- ple; seeds 4 to 4.5 mm. broad. Type locality: Sand hills on the Rio Grande near El Paso, Texas. Distribution: | Western Texas to Eastern Arizona and Chihuahua, Mexico. This species, especially the forms that have bluish and purplish joints, are very showy. Seedlings sometimes produce long, silky hairs from the areoles, in this respect resembling the Criniferae. Fic. 176.—Opuntia macrocentra. ones 0.5. S99 9 $8999 9 . macrocentra . tardospina . gosseliniana . Santa-rita angustata . atrispina azurea . phaeacantha mojavensis covillet vaseyt occidentalis . engelmannii . discata . rastrera OPUNTIA. 141 Illustrations: Cact. Mex. Bound. pl. 75, f. 8; N. Mex. Agr. Exp. Sta. Bull. 78: pl. [8]. Figure 176 represents a joint of the plant collected by Dr. Rose near the Rio Grande in New Mexico, northwest of El Paso, Texas, in 1913. 139. Opuntia tardospina Griffiths, Rep. Mo. Bot. Gard. 22: 34. 1912. Roots fibrous; low, spreading plant, the joints usually resting on the ground; joints orbicular to obovate, 16 to 24 cm. long; areoles large, usually distant, often 4 cm. apart; spines usually wanting except from the upper areoles and along the upper margin, usually single, sometimes 2 from an areole, 4 to 5 cm. long, brown, but lighter towards the apex; glochids numerous, brown, persistent; fruit red, 6 cm. long; seeds 5 mm. broad, acute on the margin. Type locality: Near Lampasas, Texas. Distribution: Eastern Texas. Illustrations: Rep. Mo. Bot. Gard. 22: pl. 11, in part; pl. 15. Figure 177 represents a joint of the plant collected by Albert Ruth in 1912, north of Dallas, Texas. Fic. 177.—O. tardospina. Xo.5. Fics. 178, 179.—Cluster of spines and joint of O. gosseliniana. Xo.4. 7 140. Opuntia gosseliniana Weber, Bull. Soc. Acclim. France 49: 83. 1902. | rom the base, the old trunk often bearing numerous, long, lish, usually very thin, as broad as or broader than long, the areoles without spines; spines porrect or nearly 5 or even 10 cm. long, brown, usually large clusters; fruit 4 cm. long, without with a depressed umbilicus. _ One meter or more high, branching f acicular spines; joints usually red or purp sometimes 2 dm. broad; lower and sometimes all so, generally 1, sometimes 2, rarely 3 from an areole, 4 to weak; glochids brown, numerous, forming on old joints very spines but bearing numerous brown glochids at the areoles, Type locality: Coast of Sonora on the Gulf of California. Distribution: Sonora and Lower California, Mexico. This species was placed tentatively in the Pubescentes by Schumann, although always glabrous; but it belongs better in the Phaeacanthae. In some of its phase’ t resembles O. macrocentra. It is a very showy species and worthy of a place in any collection. Illustrations: Monatsschr. Kakteenk. 17: 69. i, Figure 179 represents a joint of the plant collected at Hermosillo in Sonora, by Rose, Standley, and Russell in 1910; figure 178 shows a cluster of spines from a trunk areole. 142 THE CACTACEAE. 141. Opuntia santa-rita (Griffiths and Hare) Rose, Smiths. Misc. Coll. 52: 195. 1908. Opuntia chlorotica santa-rita Griffiths and Hare, N. Mex. Agr. Exp. Sta. Bull. 60: 64. 1906. Opuntia shreveana C. Z. Nelson, Galesburg Register, July 20, 1915. Compact plant, 6 to 14 dm. high, with a very short trunk; joints orbicular or a little broader than long, bluish green but deep purple about the areoles and margins; areoles 1.5 cm. apart, bear- ing numerous chestnut-brown glochids and occasionally a brown spine; flowers very handsome, deep yellow, 6 to 7 cm. broad; ovary purple, oblong. Type locality: Selero Mountains, Arizona. . Distribution: Southeastern Arizona. oy ; This species is one of the most ornamental of the opuntias, and although it does not grow well in greenhouse cultivation, it would doubtless flourish in the Southwest, where it could be given conditions similar to its wild surroundings. . Illustrations: Smiths. Misc. Coll. 52: pl. 15; Plant World 11": f. 6, this last as Opuntia chlorotica; Journ. Inter. Gard. Club 3: facing page 5, as O. chlorotica santa-rita. Plate xxiv, figure 1, is from a photograph taken by Dr. MacDougal of a plant near Surritas, Arizona, in 1906. 142. Opuntia angustata Engelmann, Proc. Amer. Acad. 3: 292. 1856. Ascending to erect; joints narrow, 15 to 25 cm. long, rounded above, gradually narrowing downward; areoles distant, often 2.5 cm. apart, large, oblong; spines sharply angled, straw-colored or whitish but with brown bases, 2.5 to 3.5cm. long; glochids brown; fruit obovoid, 2.5 to 3 cm. long. Type locality: Bottoms, Bill. Williams Fork, Arizona. Distribution: Recorded as extending from New Mexico to California, but known definitely to us only from central Arizona, perhapsextending north to Utah. Engelmann’s Opuntia angustata was based on three specimens, one from New Mexico, one from Arizona, and one from California. Hestated that the first and last were prostrate, while the second was erect. : A study of his specimens and descriptions indicates . that he had three species before him. The first is 9 from Zuni, New Mexico, and is probably Opuntia | 0 Fi phaeacantha. The California specimen is the Opuntia p | j magenta Griffiths, which is probably the same as O. vaseyt, while the suberect plant from the bottoms 0 i 3 of the Bill Williams River we have allowed to stand ) 7 for O. angustata. Wooton and Standley (Contr. = y U.S. Nat. Herb. 19: 447. 1915) suggest that the two Sy fruits illustrated by Engelmann in connection with this Fic. 180.—Opuntia angustata. species may belong to two species of Cylindropuntia. This plant was first collected by J. M. Bigelow, February 4, 1854. Illustrations: Pac. R. Rep. 4: pl. 7, f. 3, 4. Figure 180 is copied from figure 3 of the illustrations above cited. 143. Opuntia atrispina Griffiths, Rep. Mo. Bot. Gard. 21:172. 1910. Usually low and spreading, sometimes 2 meters in diameter, but sometimes the central branches nearly erect and 6 dm. high; joints rather small, nearly orbicular, 10 to 15 cm. in diameter, light green, sometimes a Irttle glaucous; lower areoles spineless; spines from the upper areoles 2 to 4, the principal ones spreading, flattened, dark brown, almost black at base, much lighter above; glochids at first yellow or yellowish, but soon changing to brown; flowers described as yellow, changing to orange; fruit reddish purple. yy Sa, i iia aah cnertgsinecgy:-nsvcacntetnctr cc, aiaamiammpiaiass i aia itl allele: ROSE ANC BRITTON Plant of Opuntia discata ) Plant of Opuntia santa-rita. 1. OPUNTIA. Type locality: Near Devil’s River, Texas. Distribution: Type locality and vicinity. 143 This plant is abundant between Del Rio, Texas, and Devil's River, being one of the two commonest species in that region. Illustrations: Rep. Mo. Bot. Gard. 21: pl. 26, in part. Plate xxv, figure 1, represents a flowering joint of the plant collected near Devil's River, Texas, by Dr. Rose in 1913. Fic. 181.—Opuntia azurea, Zacatecas, Mexico. / 144, Opuntia azurea Rose, Contr. U. S. Nat. Herb. 12: 291. 1909. Compact, upright, with a single trunk, or branching from the base and more or less spreading; joints orbicular to obovate, 10 to 15 cm. in diameter, pale bluish green, glau- cous; areoles about 2 cm. apart, the lower ones spineless, the upper ones with 1 to 3 rather stout spines; spines, at least when old, almost black, unequal, the longer ones 2 to 3 cm. long, more or less reflexed; glochids numerous, brown; petals 3 cm. long, deep yellow, with crimson claw, but in age pink throughout; filaments greenish or almost white; stigma-lobes pale green; fruit dull crimson, subglobose to ovoid, spineless, truncate, juicy, edible. Type locality: Northeastern Zacatecas, Mexico. Distribution: Zacatecas and probably Durango. Illustrations: Contr. U. S. Nat. Herb. 12: pl. 24; also f. 33. Figure 181 is from a photograph by F. E. Lloyd of the type plant; figure 182 represents joints of the plant collected by Albert de Lautreppe near Zacatecas, Mexico, in 1904. Fic. 182. Opuntia azurea. Xo.4- 144 THE CACTACEAE. 145. Opuntia phaeacantha Engelmann in Gray, Mem. Amer. Acad. 4:52. 1849. Opuntia phaeacantha brunnea Engelmann, Proc. Amer. Acad. 3: 293. 1856. Opuntia phaeacantha major Engelmann, Proc. Amer. Acad. 3: 293. 1856. Opuntia phaeacantha nigricans Engelmann, Proc. Amer. Acad. 3: 293. 1856. Opuntia camanchica Engelmann and Bigelow, Proc. Amer. Acad. 3: 293. 1856. Opuntia chihuahuensis Rose, Contr. U. S. Nat. Herb. 12: 291. 1909. , Opuntia toumeyi Rose, Contr. U. S. Nat. Herb. 12: 402. 1909. Opuntia blakeana Rose, Contr. U. S. Nat. Herb. 12: 402. 1909. Opuntia zuniensis Griffiths, Bull. Torr. Club 43: 86. 1916. (From the description.) Low, usually prostrate, with some branches ascending; joints usually longer than broad, 10 to 15 cm. long; areoles rather remote, the lower ones often spineless; spines 1 to 4, those on the sides of the joints more or less reflexed, somewhat flattened, usually rather stout, brown, some- times darker at base, or often nearly white throughout, the longer ones 5 to 6 cm. long; glo- chids numerous, yellow to brown; flowers 5 cm. broad, yellow; ovary short; fruit 30 to35 mm. long, much contracted at base. Type locality: About Santa Fé and on the Rio Grande, New Mexico. Distribution: Texas to Arizona and Chihuahua. We have referred to Opuntia phaeacantha the common low, bushy Opuntia with small joints, brown spines, and yellow flowers of the Southwest; we formerly regarded it as com- posed of several species, and others have followed our lead; but we are unable to draw any distinct lines after a study of much additional herbarium and greenhouse material. Dr. Rose has collected a large series of specimens from the Southwest, especially from the type localities, but his specimens seem to bridge over differences which before seemed tangible; cited differences appear to be racial rather than specific. Opuntia blakeana, which is found west of the Rocky Mountains, one would expect to be different. It is characterized by small obovate joints, rather short spines, small yellow flowers purple at center. ) Opuntia chihuahuensis, which was first described from Mexican specimens, if it belongs here, is in the southern range of O. phaeacantha. It, too, has yellew flowers with red centers, rather large joints, and long, slender spines. Mr. Wooton is of the opinion that to O. chthuahuensis is to be referred the common, low, brown species from El Paso, which includes the specimens of G. R. Vasey, which Coulter called Opuntia mesacantha oplocarpa. This long-spined form extends north throughout eastern New Mexico to southeastern Colorado. With the latter form Mr. Wooton believes Opuntia camanchica belongs. If we take this broad view of the limits of this species we are forced to include Opuntia toumeyt, although it is much larger than O. blakeana, and was considered by Dr. Rose to be different. Opuntia mesacantha sphaerocarpa Wooton and Standley (Contr. U. S. Nat. Herb. 19: 446. 1915) is a mistake, O. mesacantha oplocarpa being intended. Opuntia rubrifolia Engelmann in Coulter (Contr. U. S. Nat. Herb. 3: 424. 1896), from St. George, Utah, belongs in this series if E. W. Nelson’s No. 1 56, from the same place as been properly determined as such. The type specimen of O. rubrifolia has, apparently, een lost. The following varieties of Opuntia camanchica have been offered by Haage and Schmidt in their catalogues: albispina (Trade Seed Cat. 104. IglI-1912); orbicularis, rubra, and salmonea (all in Haupt-Verzeichnis 1908: 228. 1908). Under O. camanchica has been mentioned also variety luteo-staminea (Cat. Darrah Succ. Manchester 53- 1908). Opuntia eocarpa Griffiths (Proc. Biol. Soc. Washington 29: 11. 1916), also O. recurvo- spina Griffiths (Proc. Biol. Soc. Washington 29: 12. 1916) and possibly O. superbospina Griffiths (Proc. Biol. Soc. Washington 29: 13. 1916) and O. caesia Griffiths (Proc. Biol. Soc. Washington 29: 13. 1916) are of this relationship. Opuntia microcarpa* Engelmann (Emory, Mil. Reconn. 1 58.f. 7. 1848) and O. violacea Engelmann (Emory, Mil. Reconn. 158. f. 8. 1848) were described from drawings brought *Since the above was written Dr. Griffiths (Bull. Torr. Club, 43: 527) h blished i t of this species, which he regards as distinct; it inhabits southern Arizona. 45+ 527) has publighed. ¢ detailed aceourt BRITTON AND ROSE PLATE XXV M. E. Eaton del. 1. Flowering joints of Opuntia atrispina. 3. Upper part of joint of Opun 2. Flowering joint of DAuntia phaeacantha. (All natural Size. ) tia engelmannit. ~——— OPUNTIA. 145 back from the Southwest by W. H. Emory. They can never be critically identified, but are probably of this relationship. Illustrations: Engler and Prantl, Pflanzenfam. 3%: f. 57, C; Forster, Handb. Cact. ed. 2. f. 141; Ilustr. Fl. 2: f. 2530; ed. 2. 2: f. 2989; Pac. R. Rep. 4: pl. 9, f. 1 to 5; pl. 22, f. 12 to 15; Wiener IIlustr. Gartenz. 10: f. 115, all as Opuntia camanchica; N. Mex. Agr. Exp. Sta. Bull. 78: pl. [7], as Opuntia chihuahuensis; Contr. U. 5. Nat. Herb. 12: pl.55,as Opuntia blakeana; Cact. Mex. Bound. : w% pl. 75, f. 9 to 13. Dougal. Lf ws 146. Opuntia mojavensis Engelmann, Proc. Amer. Acad. 3: 293. A] ~ rt 1856. Plate xxv, figure 2, represents a flowering joint of a y7 i} plant sent from Tucson, Arizona, in 1916, by Dr. Mac- iy ,, | ry RR? , ‘4 \ Prostrate, with suborbicular joints; pulvini remote, with large Ag ° q yellow bristles; spines 2 to 6, stout and annulate, acutely angu- : lar and compressed, more or less curved, reddish brown, paler ° o ¥ toward tip, 2.5 to 6 cm. long, 1 to 3 smaller, slenderer, pale ones added below; fruit oblong, 4.5 cm. long. Type locality: On the Mojave, west of the Colorado, x California. Distribution: Known only from the type locality. The fragmentary type speci- men has been examined; we have been unable to refer any other specimens to this species, which is thus very imperfectly under- stood. Illustration: Pac. R. Rep. 4: pl. 9, f. 6 to 8. 147. Opuntia covillei Britton and Rose, Smiths. Misc. Coll. 50: 532. 1908. Opuntia megacarpa Griffiths, Rep. Mo. Bot. Gard. 20: QI. 1909. Opuntia rugosa Griffiths, Proc. Biol. Soc. Washington 27: 27. IQI4. ; Bushy plants, usually growing in dense thickets; joints orbicular to obovate, 10 to 20 cm. long or more, pale green, sometimes purplish, slightly glaucous; areoles 2 to 4 cm. apart; spines several from an areole, slender, unequal, the longest ones 6 cm. long, white when young, brownish when old; flowers large, yellow. Type locality: San Bernard- ino, California. Distribution: Interior valleys of southern California. Opuntia covillei and O. vaseyt grow it and while hybrids may occur, the two spec! Fic. 183.—Opuntia covillei. Xo.4. Fic 184.—Opuntia covillei. n the same valleys, often in adjoining colonies, es could easily be distinguished. When growing 146 THE CACTACEAE. in conjunction, O. covillei is considerably taller, has joints of different color, and has yellow flowers. It has doubtless generally passed as Opuntia occidentalis, but that is a much larger, stouter plant, with strong, more or less flattened spines, and is common along the ae igure 183 represents a joint of the plant sent by Dr. MacDougal from Elsinore, California, in 1913; figure 184 is from a photograph of a specimen collected by Mr. 5. B. Parish from near the type locality in 1916. 148. Opuntia vaseyi (Coulter) Britton and Rose, Smiths. Misc. Coll. 50: 532. 1908. Opuntia mesacantha vaseyi Coulter, Contr. U. S. Nat. Herb. 3: 431. 1896. Opuntia rafinesquei vaseyi Schumann, Gesamtb. Kakteen 717. 1898. Opuntia humifusa vaseyi Heller, Cat. N. Amer. Pl. ed. 2. 8. 1900. Opuntia magenta Griffiths, Rep. Mo. Bot. Gard. 19: 268. 1908. Opuntia rubiflora Davidson, Bull. South. Calif. Acad. 15: 33. 1916. _ Plants low, the lower stems spreading at base, but some of the branches erect and 4 to 7 joints high; joints thick, small (usually 10 to 12 cm. long), ovate, pale green, somewhat glaucous; _ es rather large, 2 to 3 cm. apart, bearing 1 to 3 spines; spines porrect, usually short (rarely 2 cm. ong), grayish brown or bright brown, whitish or yellowish towards the tips, somewhat flattened; young joints bright green, thickish, bearing short purplish leaves and a single brownish spine from an areo e; flowers deep salmon, almost a red-salmon, from the very first; ovary globular to shortly ob ong; areoles few, mostly towards the top of the ovary, spineless but with a few brown glochids; fruit globular to shortly oblong, 4 to 5 cm. long, deep purple, truncate at apex, with few areoles, the pulp sweetish but hardly edible; umbilicus broadly depressed. Type locality: Cited as Yuma, Arizona, presumably erroneously. Distribution: San Bernardino and Orange Counties, southern California. ; Even from a moving train this species is distinguishable from its relatives by the color of its flowers. It forms great thickets along the Southern Pacific Railroad north of Los Angeles, either alone or interspersed with one or more other species, and it is also common in the San Bernardino Valley toward the Cajon Pass where it forms great thickets either alone or with Opuntia covillei. Considerable quantities were seen also on hills near River- side, and it was found cultivated in the cactus garden at River- side and in the Soldiers’ Home Grounds at Santa Monica. Illustration: Bull. South. Calif. Acad. 15: 32, as Opuntia rubtflora. Figure 185 represents a joint of the plant collected by Dr. Rose at Fernando, California, in 1908. / 149. Opuntia occidentalis Engelmann and Bigelow, Proc. Amer. Acad. 3: 291. 1856. Opuntia lindheimeri occidentalis Coulter, Contr. U. S$. Nat. Herb. 3: 421. 1896. Opuntia engelmannii occidentalis Engelmann in Brewer and Watson, Bot. Calif. 1: 248. 1876.* Opuntia demissa Griffiths, Rep. Mo. Bot. Gard. 22: 29. 1912. Erect or spreading, often 1 méter high or more, forming large thickets; joints large, obovate to oblong, 2 to 3 dm.long; areoles remote; spines 2 to 7, stout, unequal, the longest ones 4 to 5 cm. long, more or less flattened, brown or nearly white, sometimes wanting; shorter spines often white; glochids often prominent, brown; flowers yellow, large, in- cluding the ovary often 10 to 11 cm. long; fruit large, purple. Type locality: Western slopes of the California Mountains, between San Diego and Los Angeles. Distribution: Southwestern California and northern Lower Fic. 185.—Opuntia vaseyi. California and adjacent islands. XO.5- In their description of this species, Engelmann and Bigelow state that it was found on - the western slope of the California Mountains near San Diego and Los Angeles. In the *Coulter refers this name to Pac. R. Rep. 4: errata, 3, 1856, but no formal name is published there. OPUNTIA. 147 Engelmann herbarium are the two original sheets. One of these comes from the ‘‘ Moun- tain Valleys of San Pasquel and Santa Isabel,”’ northeast of San Diego. This consists of a single flower and a small piece of a joint containing three bunches of spines; we doubt if this can be identified. The other comes from near Los Angeles and consists of a large pad and fruit with seeds. The spines are dark brown or nearly black. This specimen ap- pears to be the one figured in the Pacific Railroad Report and may very properly be taken as the type of the species. There is much uncertainty regarding the range of this species, some referring it to the interior valleys of California. Anex- amination, however, of the type material, and a study of the living plants in southern California by Dr. Rose, convince us that the coastal opuntias can not all be referred to O. littoralis as is sometimes done, but a part belongs to O. occidentalis. The limits of the latter species, and its distribution, are not well defined. Of this relationship is to be consid- ered Opuntia semispinosa Griffiths (Bull. Torr. Club 43: 89. 1916), which the author describes as a common, conspicuous spe- cies in the coastal region of California. Illustrations: N. Mex. Agr. Exp. Sta. Bull. 60: pl. 3,f. 2; Pac. R. Rep. 4: pl. 7, f.1, 2; pl. 22, f. 10; Rep. Mo. Bot. Gard. 22: pl. 8, this last as Opuntia demissa. Figure 186 is from a plant collected on Santa Catalina Island, California, by ; Mr. S. B. Parish in 1916. Fic. 186.—Opuntia occidentalis. 150. Opuntia engelmannii Salm-Dyck in Engelmann, Bost. Journ. Nat. Hist. 6: 207. 1850. Opuntia engelmannii cyclodes Engelmann, Proc. Amer. Acad. 3: 291. 1856. Opuntia lindheimeri cyclodes Coulter, Contr. U. S. Nat. Herb. 3: 422. 1896. Opuntia dillet Griffiths, Rep. Mo. Bot. Gard. 20: 82. 1909. Opuntia arizonica Griffiths, Rep. Mo. Bot. Gard. 20: 93. 1909. Opuntia wootonii Griffiths, Rep. Mo. Bot. Gard. 21: 171. 1910. Opuntia cyclodes Rose, Contr. U. S. Nat. Herb. 13: 309. 1911. Opuntia gregoriana Griffiths, Rep. Mo. Bot. Gard. 22: 26. 1912. Opuntia valida Griffiths, Proc. Biol. Soc. Washington 27: 24. I9I4. Opuntia confusa Griffiths, Proc. Biol. Soc. Washington 27: 28. 1914. ‘ Opuntia magnarenensis Griffiths, Proc. Biol. Soc. W ashington 29: 9. P 1916. Opuntia expansa Griffiths, Proc. Biol. Soc. Washington 29: 14. 1916. Originally described as erect and up to 2 meters high, but more properly a widely spreading bush, usually without a definite trunk; joints oblong to orbicular, 2 to 3 dm. long, t ue ‘pa ie gre n areoles distant, becoming large and bulging; spines usually more or less white, wi h ; rk red or brownish bases and sometimes with black tips, usually 3 or 4, sometimes only 1, or ol ire y ran 8 from the lower areoles, but on old joints 10 or more, usually somewhat porrect or a i le spreading, but never reflexed, the larger ones much flattened, the longest one 5 cm. long: leay es Sub sates about 15 mm. long; glochids numerous, brown with yellowish tips; flowers large, y ; 3-5 to 4 cm. long, red; seeds small, 3 to 4 mm. broad. Type locality: From El Paso to Chihuahua. i New Mexi “exas. Distribution: Chihuahua, Durango, Sonora, Arizona, New Mexico, and Te 148 THE CACTACEAE. An examination of the plant collected by Wislizenus (No. 223) north of Chihuahua, now in the herbarium of the Missouri Botanical Garden and labeled by Dr. Engelmann as O. engelmannit Salm-Dyck, shows that this species is of Schumann’s series Fulvispinosae (our series Phaeacanthae) rather than series Tunae. Opuntia engelmannti has been more confused than any other species of Opuntia. Salm-Dyck, who first studied the species, doubtless had but a single specimen before him, and this or a duplicate is nowin the herbarium of the Missouri Botanical Garden. ‘This type specimen came from near Chihuahua City, from which place Dr. Rose has collected identical material. Dr. Engelmann, who published Salm-Dyck’s name, described the plant as erect and 5 to 6 feet high, giving its range from Chihuahua City to Texas. These remarks of his were doubtless based on notes of Dr. Wislizenus, who collected the type, and must have included more than one species; as Engelmann says it is both cultivated and wild, the cultivated plants doubtless referring to some of the many forms grown about towns and ranches. In 1852 Engelmann extends the distribution of the species westward to the Pacific Ocean, referring especially to a San Diego specimen. In 1856 he refers here his previously described species O. lindheimeri, and extends the range eastward to the mouth of the Rio Grande and to lower Mexico. Coulter brought all this material together under O. lindheimeri and four varieties. 7 An examination of herbarium and greenhouse specimens shows that at least half a dozen species have been passing under the name of O. engelmannii. While certain varieties and specimens are evidently to be excluded from the species, we are still uncertain as to its specific limits. It is quite common about Chihuahua City and extends to Monterey and Saltillo or is represented there by a near ally, while Mr. E. O. Wooton would refer here plants of southern New Mexico, and we are including large, bushy opuntias from Arizona. Dr. Rose was inclined at one time to separate the Tucson plant, which seems to have some just claims for specific recognition, but there is a mass of herbarium material which seems to connect this with the true O. engelmannii. Opuntia engelmannii monstrosa (Cat. Darrah Succ. Manchester 54. 1908) is doubt- less one of the abnormal forms so common among the flat-jointed opuntias. Opuntia cyclodes, first found by Bigelow near Anton Chico, New Mexico, is certainly of this relationship. The characters of orbicular joints, of small fruit and of stout, usually solitary spines, originally assigned to it, are not constant, for it often has obovate to oblong joints bearing as many as four slender spines and large fruit. In 1913 Dr. Rose explored the upper Pecos, especially about Anton Chico, near the type locality, where he collected specimens similar to the Bigelow plant, but these grade into more spiny forms, some bearing as many as five spines at an areole, usually yellow, especially distally, and more slender than in typical O. engelmannii. From the same type locality, and associated with O. cyclodes, is O. expansa Griffiths, which has more and whiter spines than the typical form, although they are sometimes yellowish with brown bases. O. dillei Griffiths is also related to O. cyclodes, but the spines are fewer; Dr. Grif- fiths states, however, that more spines develop on cultivated plants. Illustrations: Pac. R. Rep. 4: pl. 8, f. 1; pl. 22, f. 8, 9, all as Opuntia engelmannii cyclodes; Rep. Mo. Bot. Gard. 20: pl. 4, in part, as Opuntia dillei. Ariz. Agr. Exp. Sta. Bull. 67: pl. 7, f. 1; Rep. Mo. Bot. Gard. 20: pl. 10; Safford, Ann. Rep. Smiths. Inst. 1908: pl. 10, f. 3, 6, all as Opuntia arizonica. Rep. Mo. Bot. Gard. 21: pl. 26, in part, 27, both as Opuntia wootontt. Rep. Mo. Bot. Gard. 22: pl. 3, this last as Opuntia gregoriana. Standley, Ann. Rep. Smiths. Inst. 1911: pl. 2; Bull. Torr. Club 32: pl. 10, f. 10 to 13; Cact. Journ. 2: 147; Cact. Mex. Bound. pl. 75, f. 1 to 4; Cycl. Amer. Hort. Bailey 3: f. 1547; Gard. Chron. III. 30:f. 123; N. Mex. Agr. Exp. Sta. Bull. 78: pl. [5, 6]. Plate xxv, figure 3, represents a flowering joint of a plant sent from Arizona by Dr. MacDougal in 1902. OPUNTIA. 149 151. Opuntia discata Griffiths, Rep. Mo. Bot. Gard. 19: 266. 1908. Opuntia gilvescens Griffiths, Rep. Mo. Bot. Gard. 20: 87. 1909. Opuntia riparia Griffiths, Proc. Biol. Soc. Washington 27: 26. 1914. Plants bushy, spreading, sometimes 15 dm. high; joints thick, orbicular to broadly obovate, 2.5 dm. in diameter or less, pale bluish green, somewhat glaucous; areoles rather few, distant, in age becoming very large, hemispheric, filled with short brown wool; spines usually 2 to 4, sometimes 7 or more in old areoles, 2 cm. long or more, grayish with dark bases, somewhat flattened; flowers large, 9 to 10 cm. broad, light yellow, darker near the center; style white; stigma-lobes green; fruit magenta, pyriform, 6 to 7 cm. long. Type locality: Foothills of Santa Rita Mountains, Arizona. Distribution: Foothills and high mesas of southern Arizona and northern Sonora. Illustrations: Rep. Mo. Bot. Gard. 20: pl. 2, f. 5; pl. 7; pl. 13, f. 6, all as Opuntia gil- vescens; Amer. Garden 11: 469, this last as Opuntia angustata. Ariz. Agr. Exp. Sta. Bull. 67: pl. 1, f. 2; Bull U. S. Dept. Agr. 31: pl. 3, f. 2; Rep. Mo. Bot. Gard. 19: pl. 27, in part. Plate xxiv, figure 2, is from a photograph taken by Dr. MacDougal in the Tortolita Mountains, Arizona, in 1916; Opuntia discata is the plant shown in left foreground. 152. Opuntia rastrera Weber, Dict. Hort. Bois 896. 1898. ?Opuntia lucens Griffiths, Rep. Mo. Bot. Gard. 19: 269. 1908. Creeping plant; joints circular to obovate, the largest 2 dm. in diameter; spines white, several from an areole, the longest 4 cm. long; glochids yellow; flowers yellow; fruit purple, acid, obovoid. Type locality: San Luis Potosi, Mexico. Distribution: The type locality and vicinity. _ This species was very briefly described in 1898 by Dr. Weber, who states that it is quite distinct from O. tuna, the Jamaican species. Schumann, who treats it in a note under O. tuna, states that it is a well-differentiated species from Mexico. From descriptions we are referring here O. lucens Griffiths, also described from San Luis Potosi specimens. Dr. Griffiths states that his O. lucens is related to O. engelmannit, but has a different habit; he says it is called cuija by the Mexicans, but that it is very different from Opuntia cuzja. Series 12. ELATIORES. reoles bearing acicular, setaceous, or subulate bout twelve species, most of them South (O. fuliginosa) in Mexico. Tall species, with flat, broad, persistent joints, the a brown spines, or some species spineless. We know about American, with one in Florida (see Appendix p. 222), possibly one Kry TO SPECIES. Joints very spiny. Spines not banded. Areoles surrounded by a purple blotch........---+55s2srsrcrerer ster 153. O. brunnescens Areoles not surrounded by a purple blotch. +54. 0. galapageia Spines setaceous; petals vellow.......---.000 cers tyes ert . 0. Spines, when present, acicular or subulate; petals mostly red or orange. 155. 0. delaetiana Joints strongly undulate; spines short, stout.......-0-0.0020 errr rete snes 0. Joints not undulate or scarcely undulate. +56. 0. bergeriana Joints bluish green, glaucous....---. Lecce tenes neers ness ressn sess Joints bright green, not glaucous or slightly glaucous Spies, at le presents Jot orn or L ackish : joints dull........-- 157. O. elatior Spines, when present, dark brown or bl Spines light brown to straw-colored. _ «48. 0. hanburyans Spines up to 5 cm. long; joints shining eeu eneeeseeeeeeserene . O. hur) i cm. long or less; joints Gull. | oP lowers 12 to 15 mm. wide; spines I to 4 at an areole or wanting......- sense Flowers 5 to 6 cm. wide; 159. O. quitensis 159a. QO. soederstromiana 160. O. schumannit ines subulate, stout; joints shining... ...--2+2.22s5s0cc man Spines aciollars petals yellow; joints shining [in this series?}.... 0 - en O Suligin Spines distinctly banded; joints dark green, obscurely glaucous......----- Doce ue eeee Joints usually spineless, 162. O. boldinghii Bushy, 1 to 2 meters high; flowers rose...-.---. 05000000 oe : 163. O. distans Erect, 3 to 4 meters high; flowers orange-red.....--- 2522s 7? 150 THE CACTACEAE. 153. Opuntia brunnescens sp. nov. - Usually low and prostrate, sometimes 1 meter high, without a definite trunk, usually forming a bushy clump; joints oblong to orbicular, 15 to 30 cm. long, smooth, dull green, except the purple blotches about the prominent areoles; spines 2 to 5, brownish, porrect or pointing forward, up to 4.5 cm. long, stout, sometimes twisted. Hills about the city of Cérdoba, Argentina, where it was collected by Rose and Russell, September 8, 1915 (No. 21029). This species is very common on the dry hills about Cérdoba, where it is often associ- ated with Opuntia sulphurea. It apparently extends northward into Jujuy. Figure 187 represents a joint of the type specimen above cited; figure 188 shows its fruit collected by Dr. Shafer (No. 78). > 154. Opuntia galapageia Henslow, Mag. Zool. and Bot. 1: 467. 1837. Opuntia myriacantha Weber, Dict. Hort. Bois 894. 1898. Opuntia helleri Schumann in Robinson, Proc. Amer. Acad. 38: 180. 1902. Opuntia insularis Stewart, Proc. Calif. Acad. IV. 1:113. 1911. Sometimes low and creeping, but often becoming very large, 5 to 10 meters high, with a large top either open or very compact and rounded; trunk at first very spiny and made up of flat joints set end to end, with the short axis of each joint at right angles to that of the adjacent joint, in time becoming terete, and when old nearly naked, 3 to 13 dm. in diameter; bark of old trunks smooth, brown, peeling off in thin layers; joints oblong to orbicular, usually very large, 1.5 to 3.5 dm. long, very spiny; areoles large, often prominent on the trunk, there especially forming knobs bearing numerous spines; spines extremely variable, but nearly all yellowish brown; areoles on young, vigorous plants very stout and rigid, very unequal, the longest 7 to 8 cm. long; joints of old plants bearing more or less pungent bristles or sometimes very weak soft hairs instead of spines, while the spines from the trunks often are very stout and sometimes 4o in a cluster; flowers yellow, 7.5 cm. broad; ovary more or less tuberculate; fruit greenish, sometimes borne in the ends of joints, more or less spiny; seeds large, 5 to 6 mm. broad, white, covered with soft hairs. ~— Fic. 187.—O. brunnescens. Xo.4. Fic. 188.—Fruit of O. brun- Fic. 190.—Flower of same. Fic. 189—Joint of nescens. X0.g. X0.75 O. galapageia. Type locality: Galapagos Islands. Distribution: Very common, often forming forests, on the Galapagos Islands. We have here combined the four species reported from the Galdpagos Islands, while ban Stewart, in his admirable paper on the botany of these islands, not only recognizes our species, but describes a fifth without specific name. He also has fourteen full-page OPUNTIA. 151 illustrations showing fine habit views-of the Galapagos Opuntia. The early descriptions of this species were very inaccurate and, as pointed out by Mr. Stewart, the characters assigned to its fruit are those of a Cereus-like plant. Mr. Stewart visited the Gal4pagos Islands in 1905-1906 and brought back a remarkable series of photographs and specimens. Through the kindness of Miss Alice Eastwood, Curator of Botany in the California Academy of Sciences, we have been able to study this material. It consists of about forty sheets of well-preserved joints with a few flowers and fruits. These, in connection with the pub- Fic. 191.—Opuntia galapageia. X0.75. abit, armament of joints, and char- lished illustrati f variation in h ons, show a great range 0 Wd ; ' . . rked, they are similar to what is acter of spines. While these differences are very market) a cotricha, or in sometimes met with in other opuntias, such as 0. gosseliniana and 0. eucott i 1 oF in certain Peruvian and Chilean types of Cereus relatives; indeed, in a a ber 0 cacti which live under intense desert influences, most diverse forms in the same species are oven produced. The habit-character in this species seems to be of little value, according to Mr. 152 THE CACTACEAE. Stewart himself, for he calls attention to procumbent and arborescent forms of O. gala- pageia, while the greatest range of spine characters is shown between the young plants and old ones and between the trunk and the joints. The specimen which Mr. Stewart has made the type of his Opuntia insularis is quite different from all the others, and yet one can easily believe that intergrades could be found; his species is described without flowers or fruit. Mr. Stewart states that this Opuntia forms the principal article of food for the Galapagos land tortoise. Its trunk becomes thicker than that of any other known species of the genus. Illustrations: Gard. Chron. III. 24: f. 75; Mag. Zool. and Bot. 1: pl. 14, f. 2; Proc. Calif. Acad. IV. 1: pl. 7, f. 2; pl. 8; pl. 9, f. 2; pl. roto 12. Gard. Chron. Ser. III. 27: f. 56; Proc. Calif. Acad. IV. 1: pl. 7, f. 1; pl. 13, f. 2; pl. 16 to 18, all as Opuntia myriacantha. Proc. Calif. Acad. IV. 1: pl. 13, f. 1; pl. 14, the last two as Opuntia helleri. Proc. Calif. Acad. IV. 1: pl. 9, f. 1; pl. 15, the last two as Opuntia insularis. Figure 189 represents a joint of the plant collected by Robert E. Snodgrass and Edmund Heller on Wenman Island, Galapagos, on the Hopkins-Stanford Expedition (type of Opuntia helleri Schumann), drawn from the herbarium specimen in the Gray Herbarium; figure 190 is of a flower of the same plant; figure 191 is from a photograph of an herbarium specimen collected by Alban Stewart. 155. Opuntia delaetiana Weber in Vaupel, Bliihende Kakteen 3: pl. 148. 1913. Opuntia elata delaetiana Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 10: 392. 1904. Joints oblong, 25 cm. long, 8 cm. broad, bright green, at first thin and spineless, the margin strongly undulate; areoles large, bearing 3 to 5 straight, rose-colored or yellowish brown spines up to 4 cm. long; leaves subulate, about 4 mm. long, glochids wanting in young areoles, later appearing numerous and brown; flower-buds rounded at the apex; outer sepals orbicular, obtuse, red; flower rotate, 5 to 7 cm. broad, orange-colored; stigma-lobes white; fruit oblong or pyriform, red, 5 to 7 cm. long, 3 to 5 cm. in thickness. Type locality: Paraguay. Distribution: Paraguay and northeastern Ar- gentina. , The plant was collected by Dr. Thomas Morong at Asuncién, Paraguay, in 1888, and re- ferred in his list of plants collected in Paraguay (Annal. N. Y. Acad. Sci. 7: 121. 1892) to O. nigri- cans Haworth; Dr. Shafer found it in 1917 in waste places and in hedge-rows about Concordia and Po- sados, Argentina. This species may more prop- erly belong in our series Elatae than in Elatiores. Illustration: Blithende Kakteen 3: pl. 148. Figure 192 is copied from the illustration above cited. 156. Opuntia bergeriana Weber in Berger, Gard. Chron. IIT. 35: 34. 1904. Growing singly or in dense thickets, often 1 to 3.5 meters high and having a trunk 3 to 4 dm. in diameter, with a large, spreading top, or clambering over walls and rocks; joints narrowly oblong, sometimes 2.5 cm. long, when young often quite narrow, bright green, but becoming dull and somewhat glaucous; areoles rather distant, on old joints 2 to 4 cm. apart, filled with short gray wool; spines 2 or 3, rarely 5, unequal, the longest one 3 to 4 cm. long and somewhat flattened, more or less brownish at base, sometimes yellowish, porrect, or somewhat turned down- ward; leaves 2 to 3 mm. long, fugacious; glochids yellow but sometimes turning brown, rather promi- nent, forming a half circle in the upper part of the areole: areoles circular, when young filled with light brown wool in the center and white in the outer region; flowers numerous, showy, deep red; Fic. 192.—Opuntia delaetiana. BRITTON AND ROSE M. E. Eaton del 3. Flowering joint of Opuntia bolding hit 4,5. Joints of Opuntia elata. (All natural size.) 1. Flowering joint of Opuntia bergeriana. 2. Flowering joint of Opuntia elatior. OPUNTIA. 153 some joints bearing 20 or more; petals 2.5 cm. long, mucronate; filaments numerous, scarlet-rose; stigma-lobes 6, green; fruit small, 3 to 4 cm. long, red, not edible; seeds few, flattened, 5 mm. broad. Type locality: Described from cultivated specimens. . Distribution: Not known in the wild state, but now very common on the Riviera, northern Italy, forming large thickets. Mr. Berger would place this species next to O. nigricans, which we now call O. elatior. This species was named for Alwin Berger, formerly curator of the Hanbury Garden at La Mortola, Italy, who sent material to the late Dr. Weber, from which the species was described. The species is quite common on the Riviera and has run wild in many places, especially about Bordighera, Italy. It produces a great abundance of flowers in May, but blooms more or less throughout the year. Opuntia ledienit (Berger, Hort. Mortol. 233. 1912), unpublished, is referred here. Illustrations: Gard. Chron. III. 35: f. 14; Monatsschr. Kakteenk. 16: 156. Plate xxv, figure 1, represents a flowering joint of a plant sent from La Mortola, Italy, to the New York Botanical Garden in 1906. 157. Opuntia elatior Miller, Gard. Dict. ed. 8. No. 4. 1768. Cactus nigricans Haworth, Misc. Nat. 187. 1803. , Opuntia nigricans Haworth, Syn. Pl. Succ. 189. 1812. a T tev arr Cactus elatior Willdenow, Enum. Hort. Berol. Suppl. 34. 1813. mato oterl ph) aert’ oer poten: Y Cactus tuna nigricans Sims, Curtis’s Bot. Mag. 38: pl. 1557. 1813. q @ Cactus tuna elatior Sims, Curtis’s Bot. Mag. 38: under pl. 1557. 1813. Cactus pseudococcinellifer Bertoloni, Excerpta Herb. Bonon. 11. 1820. Plants densely bushy-branched, up to 5 meters high; joints obovate to oblong or suborbicular, olive-green, 1 to 2 dm. or even 4 dm. long; leaves 4 mm. long, green with reddish tips; areoles 2 to 4 cm. apart; spines 2 to 8, acicular, mostly terete, dark brown, 2 to 4 cm. or even 7 cm. long; flowers about 5 cm. broad; petals dark yellow striped with red or sometimes salmon-rose, with mucronate tips; filaments numerous, pink or red; style nearly white; stigma-lobes 5, green; ovary ovoid, deeply umbilicate, its areoles either with or without spines; fruit obovoid, truncate when mature, reddish, the pulp dark red; seeds about 4 mm. broad. Type locality: Unknown. ; Distribution: Common or frequent in Curacao, Venezuela, Colombia, and Panama, escaped from cultivation in Australia. O. nigricans has been referred to Mexico, but doubtless wrongly, unless cultivated there. Plants brought by Dr. Howe from Tobogilla Island, Panama, have narrowly obovate joints. The early history of this species and its various synonyms are rather confusing. Dil- lenius figured Opuntia elatior and this name was taken up by Miller in 1768. There is some doubt as to its native home, but it probably came from northern South America, or possibly Curacao. Opuntia nigricans, also referred here, was described by Haworth from cultivated specimens; plate 1557 of Curtis’s Botanical Magazine was made from Haworth’s specimen and may be considered typical. Introduced into cultivation in Europe about 1793. , Illustrations: Loudon, Encycl. pl. ed. 3. f. 6877, as Cactus elatior; Curtis S Bot. Mag. 38: pl. 1557, this last as Cactus tuna nigricans; Dillenius, Hort. Elth. pl. 294, this as Tuna elatior, etc.; Agr. Gaz. N. S. W. 23: pl. opp. 208; pl. opp. 210, both these as Opuntia nigricans; Journ. Hort. Home Farm. III. 60: 30, this as Opuntia occidentalis. Plate xxvi, figure 2, shows a flowering joint of a specimen obtained by Dr. Britton and Dr. Shafer in Curacao in 1913. 158. Opuntia hanburyana Weber in Berger, Gard. Chron. III. 35: 34. 1904. Bushy, 1 to 2 meters high, somewhat straggling; joints narrowly oblong, about 3 dm. long , bright green; leaves subulate, 4 to 5 mm. long; areoles closely set, filled with brown or blackish w ool ; spines several, spreading, acicular, somewhat flattened and twisted, yellowish brown, the longest 3 cm. long; flowers widely spreading, rather small; fruit small. Type locality: Described from cultivated plants. Distribution: Not known in the wild state. Corte 154 THE CACTACEAE. The species commemorates Sir Thomas Hanbury, who, through his extensive garden at La Mortola, Italy, contributed much to botany and horticulture. Illustration: Gard. Chron. III. 35: f. 15. Figure 193 represents joints of the plant sent from La Mortola, Italy, in 1913. 159. Opuntia quitensis Weber, Dict. Hort. Bois 894. 1898. Bushy, sometimes 2 meters high; joints obovate, 1 to 4 dm. long, 8 to 9 cm. broad; areoles small, distant, 2 cm. apart, bearing some white tomentum and short glochids; spines wanting, or 1 to 3, sometimes as many as 4 on old joints, straight, yellowish brown, or nearly white when young, acicular, somewhat flexu- X 4 ous, 2 to 3 cm. long; leaves green, minute, acute; flowers red, > oO 12 to 15 mm. broad; petals erect, obtuse; anthers white; style white, short and thick; stigma-lobes 13, white, about as long as the style; fruit obovoid, red, nearly spineless, about 2 cm. long; seeds about 3 cm. broad. aa SY _s y x4 . » » ar, ZA » A ; q x NW Ve 2 Z , ?P e- 4 P a R e R oO < Qs 9 : te) 4 0S — , ° = Sy Fic. 193.—O. hanburyana. Xo.s. Fic. 194.—O. quitensis. Xo.5. Type locality: Near Quito, Ecuador. Distribution: Ecuador. As observed by Dr. Rose in Ecuador in 1918, this species is very variable in habit, for when grown in the open it is low and bushy with rather small joints, but when grow- ing in thickets it becomes tall and has large joints. About Huigra, where it is very common, it is often spineless, and when the spines are present they are few and weak. In southern Ecuador there is a plant which has small, red flowers like this species, but the joints have stout subulate spines. | Figure 194 represents a joint of a plant obtained in 1901 for the New York Botanical Garden from M. Simon, of St. Ouen, Paris, France. 159a. Opuntia soederstromiana sp. nov. (See Appendix, p. 221.) OPUNTIA. 155 160. Opuntia schumannii Weber in Berger, Gard. Chron. III. 35:34. 1904. Bushy, 1 to 2 meters high; joints obovate to oblong, 1.5 to 2.5 cm. long, dull dark green; areoles ‘distant, medium sized; spines 2 to 10, slightly spreading, very unequal, the longest ones 4.5 cm. long, more or less twisted, flattened, dark brown; glochids few, soon disappearing; flowers 6 cm. long, yellowish to orange, turning in age to dull red; ovary tuberculate, spineless, deeply umbilicate; fruit dark purple, turgid, juicy, deeply umbilicate, 5 cm. long. Type locality: Not cited. Distribution: Northern South America; sometimes assigned to Argentina. Opuntia schumannii is described by Berger as being intermediate between Opuntia and Nopalea, and according to him, it has long stamens and upright petals; otherwise it has little in common with Nopalea; a plant from Santa Clara, Colombia, which agrees with plants of O. schumannii from La Mortola, Italy, has a normal Opuntia flower. Illustration: Gard. Chron. III. 35: f. 16. Plate xxvu, figure 1, represents a fruiting joint of the plant collected by John G. Sin- clair at Santa Clara, Colombia, in 1913; figure 2 shows a flower of the same plant. 161. Opuntia fuliginosa Griffiths, Rep. Mo. Bot. Gard. 19: 262. 1908. Tall, tree-like, 4 meters high or more, much branched; joints orbicular to oblong, 3 dm. long or less, shining; leaves subulate, 8 to 12 mm. long; areoles distant; spines few, rarely as many as 6, dull brown or horn-colored, the longest ones 4 cm. long, slightly twisted; glochids yellow to brown; flowers at first yellow but in age red, 5 to 6 cm. long including the ovary; stigma-lobes yellowish green; fruit pyriform to short-oblong, 3 to 4 cm. long, red; seeds 5 mm. broad. Type locality: Near Guadalajara, Mexico. Distribution: Central Mexico. We refer this species to our series Elatiores with hesitation. Illustration: Rep. Mo. Bot. Gard. 19: pl. 25. 161a. Opuntia zebrina Small, Journ. N. Y. Bot. Gard. 20: 35. 1919. (See Appendix, p. 222.) 162. Opuntia boldinghii sp. nov. Bushy, 2 meters high; joints dull green, somewhat glaucous, obovate, 2 cm. long, spineless or with very short brown spines; leaves conic, red, 2 to 3 mm. long; areoles large, elevated, filled with short brown wool; flowers rose-colored, 5 cm. long; petals obtuse; filaments pink, much shorter than the petals; style nearly white; stigma-lobes yellowish; fruit obovate, 4 cm. long, spineless; seeds 4 mm. in diameter. Collected by Dr. N. L. Britton and Dr.J. A. Shafer, March 1973, in cultivation on Curacao (No. 2905, type); also collected by H. Pittier around El Palito, Venezuela, July 2, 1913 (No. 6450), and by Dr. Rose in a hedge at Valencia, Venezuela, October 27, 1916 (No. 21842). This species is named in honor of Dr. I. Boldingh, a Dutch botanist, author of a valuable descriptive flora of the Dutch West Indian islands. Plate xxvi, figure 3, shows a flowering joint of a specimen obtained by Dr. Britton and Dr. Shafer in Curacao in 1913. 163. Opuntia distans sp. nov. Erect, densely much branched, 3 to 4 meters tall, with a short trunk 1. 5 dm. in diameter; joints flat, bluish green when young, grayish green when old, obovate, 2 to 2.5 dm. long, about 1.5 dm. wide and nearly 2 cm. thick, rounded above, narrowe Fic. 195—Joint of O. distans. Xo.4. 156 THE CACTACEAE. at the base, glabrous; areoles few, only about 12 on each side of a joint, distant, large, nearly cir- cular, 8 to 10 mm. broad, slightly elevated, bearing many short glochids, but quite spineless; leaves subulate, about 3 mm. long; ovary obconic, 3 to 4 cm. long, bearing a few small areoles; sepals . broadly triangular, acute, 6 to 10 mm. long; petals broad, rounded, 1 to 2 cm. long, orange-red. Distribution: Sandy places, Andalgala, Catamarca, Argentina, J. A. Shafer, December 15, 1916 (No. 7). A spineless species noteworthy for its few, large, distant areoles. We append it to the series Elatiores, but are uncertain as to its real affinity. The large distant areoles forbid associating it with the Ficus-indicae or the Streptacanthae. Figure 195 represents a joint of the type specimen. Series 13. ELATAE. Erect, tall species, natives of South America, with oblong or oval joints, the brown or white spines, when present, only one or few at each areole, except on the trunk and old joints. KEY TO SPECIES. Joints ovate to broadly oblong or obovate. Joints thin, lustrous, light green... 2.0.0.0 cette ees 164. O. vulgaris Joints turgid, dull green. Leaves purplish, rigid; joints dark green...... 0.0.0... eee 165. O. elata Leaves green, not rigid; joints pale green. Spines slender, terete... 0.0.0.0... 00 cee tte eee ees 166. O. cardiosperma Spines stout, angled, elongated............. 00... e eects 167. O. arechavaletat Joints narrowly oblong to linear or spatulate. . Joints oblong to linear; flowers brick-red....... 00.00.0022 ee 168. O. mieckleyi Joints spatulate; flowers orange............. 000 0c cece tee eee 169. O. bonaerensis 164. Opuntia vulgaris Miller, Gard. Dict. ed. 8. No. 1. 1768. Cactus monacanthos Willdenow, Enum. Pl. Suppl. 33. 1813. Opuntia monacantha Haworth, Suppl. Pl. Succ. 81. 1819. Cactus urumbeba Vellozo, Fl. Flum. 207. 1825. Cactus indicus Roxburgh, FI. Indica 2: 475. 1832. Cactus chinensis Roxburgh, FI. Indica 2: 476. 1832. Opuntia monacantha gracilior Lemaire, Cact. Gen. Nov. Sp. 68. 1839. Opuntia umbrella Steudel, Nom. ed. 2. 2: 222. 1841. Opuntia roxburghiana Voigt, Hort. Suburb. Calcutt. 62. 1845. Opuntia monacantha deflexa Salm-Dyck, Cact. Hort. Dyck. 1849. 66. 1850. Opuntia lemaireana Console in Weber, Dict. Hort. Bois 894. 1898. Plant 2 to 4 or even 6 meters high, often with a definite trunk, usually with a large much branched top; trunk cylindric, 1.5 dm. in diameter, either spiny or smooth; joints ovate to oblong, narrowed at base, 1 to 3 dm. long, bright shining green; leaves subulate, 2 to 3 mm. long; areoles filled with short wool; glochids brownish; spines 1 or 2, sometimes more (on the trunk often 10 or more) from an areole, erect, 1 to 4 cm. long, vellowish brown to dark reddish brown; flowers yellow or reddish, 7.5 cm. broad; sepals broad, each with a broad red stripe down the middle; petals golden- yellow, widely spreading; filaments greenish; style white; stigma-lobes 6, white; ovary spineless, 3-5 cm. long; fruit obovoid, 5 to 7.5 cm. long, reddish purple, long-persisting, sometimes proliferous. Type locality: Type based on an illustration, the origin unknown. Distribution: Coast and islands of Brazil, Uruguay, and Argentina; in the interior to Paraguay; an escape in Cuba, India, and south Africa and naturalized in Australia; fre- quently cultivated. According to J. H. Maiden it is found in every state of Australia, but it is not inclined to spread and become a pest. As has been recently pointed out by Burkill, the Opuntia vulgaris of Miller is the same as O. monacantha Haworth. O. vulgaris was based on Bauhin’s figure (Hist. Pl. 1: 154- 1650), which was taken from Lobelius (Icones 2: 241. 1591), and is a tall, branching plant. This species is not to be confused with the low, spreading species of the eastern United States, long known as O. vulgaris. (See. p. 127.) This species is said by Burkill to be distributed over the earth more widely than any other, but our observation in America is that O. ficus-indica is by far. the most widely spread species. ii nail aa ce i i i i BRITTON AND ROSE j my M. E. Eaton def 1. Upper part of fruiting joint of Opuntia schumannit. 2. Flower of ( \puntia schumannit. : (All natural size.) w PLATE XXVII Flowering joint of Opuntia vulgaris. Flowering joint of Opuntia stricta. OPUNTIA. | 157 O. vulgaris was one of those most commonly used in the nopalries of India and South Africa in the cochineal industry. We have referred both of Roxburgh’s species here, although Burkill was inclined to refer Cactus chinensis to O. decumana, which in his sense is O. ficus-indica. Opuntia monacantha variegata (listed in Cat. Darrah Succ. Manchester 57. 1908) is common in cultivation. Some of the joints are normally green; others are more or less blotched with white or yellow, while others may be entirely white or yellow; the leaves are bright red and though small are conspicuous. Opuntia urumbella Steudel (Nom. ed. 2. 1: 246. 1840), given as a synonym of Cactus urumbella, is doubtless a name for this species. Opuntia deflexa Lemaire (Cact. Gen. Nov. Sp. 68. 1839) was given as a synonym of O. monacantha gracilior; while the latter was given as a synonym of 0. elatior deflexa Salm- Dyck (Cact. Hort. Dyck. 1844. 47. 1845). Illustrations: Rev. Hort. 41: f. 37; 66: f. 58; Bauhin, Hist. Pl. 1: 154 [= Lobelius, Icones 2: 241], this last as Opuntia vulgo, etc. Anal. Mus. Nac. Montevideo 5: pl. 32; Curtis’s Bot. Mag. 68: pl. 3911; Dept. Agr. N.S. W. Misc. Publ. 253: pl. [3], [4]; Agr. Gaz. N.S. W. 24: facing p. 864; Edwards’s Bot. Reg. 20: pl. 1726; Gard. Chron. III. 30: f. 122, in part; 34: f. 35; Journ. Dept. Agr. Vict. 6: pl. 25; Martius, Fl. Bras. 4”: pl. 62; Weeds, Pois. Pl. Nat. Al. Vict. pt. 1. pl. [ro], [32], allasOpuntia monacantha; Amer. Garden 11: 529; Cact. Journ. 1: 167, these last two as Opuntia monacantha variegata; Vellozo, FI. Flum. 5: pl. 32, as Cactus urumbeba; De Candolle, Pl. Succ. Hist. 2: pl. 138 [B]; De Tussac, FI. Antill. 2: pl. 31, these last two as Cactus opuntia tuna; Gard. Chron. III. 47: f. 174, this as Opuntia ficus-indica; Riim- pler, Sukkulenten f. 122, this as Opuntia tuna; Addisonia 1: pl. 38. Plate xxvii, figure 3, represents a flowering joint of a plant pre- sented to the New York Botanical Garden by Mr. Gustav Rix in 1900. 165. Opuntia elata Link and Otto in . tiosperma . Salm-Dyck, Hort. Dyck. 361. Fic. 196.—O. elata. X0.4- Fic. 197.—O. cardiosperma. 1834. X0.4- . os : - t m. long, half An erect plant, 1 meter high or more, joints thick, dark green, oblong, an eter), Gite : with as broad as long; leaves minute, caducous; areoles remote, large (7 mm. in there short white wool, usually spineless; spines if present only 1 to 3, except on ord “ems aueistent ; more, horn-colored, stiff, sometimes 3.5 cm. long; glochids very tardy in appearing: a te. flowers about 5 cm. broad, orange-yellow; petals obtuse, broad; filaments short, Sis fruit oblong, 6 cm. long, spineless, with a truncate umbilicus; seeds 6 mm. broad. Type locality: In Brazil. Distribution: Paraguay, but according probably Curacao; our exploration of Curacao failed to pr grown for ornament in Cuba and has there escaped from cu sides and waste grounds. ; . Schumann did not know where to place this species, but we related to Opuntia vulgaris. to Salm-Dyck and Pfeiffer, from Brazil and ove its existence there. It 1s Itivation in gardens to road- believe it is most nearly 158 THE CACTACEAE. Plate xxvI, figure 4, represents a flowering joint of a plant given to the New York Botanical Garden by Frank Weinberg in 1903; figure 5 represents another joint of the same plant. Figure 196 represents a joint of a plant obtained by Professor Carlos de la Torre at Punta de los Molinos, Cuba, in 1912. 166. Opuntia cardiosperma Schumann, Monatsschr. Kakteenk. 9: 150. 1899. About 2 meters high, erect, branching; joints narrowly oblong to obovate; rounded at apex, 10 to 15 cm. long or smaller in greenhouse specimens, easily breaking apart, pale green, more or less tuberculate; leaves minute, subulate; areoles large, 1 to 2 cm. apart, with white wool, when young having conspicuous secreting glands; spines, when present, 1 to 4, acicular, stiff, more commonly 1 or 2 from an areole, short, 1 to 2 cm. long, brownish at first but nearly white when old, porrect or ascend- ing; glochids tardily developing, never conspicuous, brownish; flowers unknown; fruit elongated, pear-shaped, 7.5 cm. long; seeds 6 mm. broad, 2.5 to 3 mm. thick, cordate, gray, with broad yellow margins, woolly on the sides. Type locality: At Recoleta, near Asuncién, Paraguay. Distribution: Paraguay. Figure 197 represents joints of the plant sent to the New York Botanical Garden from La Mortola, Italy, in 1913. 167. Opuntia arechavaletai Spegazzini, Anal. Mus. Nac. Buenos Aires. III. 4: 520. 1905. Plants tall, 1 to 3 meters high, much branched; joints flattened, oblong to obovate, 25 to 30 cm. long, green, spines, usually 1, sometimes 3, elongated, porrect, up to 9 cm. long, white, flattened; flowers 4.5 cm. long, yellow; stamens and style white; fruit violet-purple, 7 cm. long. Type locality: Near Montevideo, Uruguay. Distribution: Argentina and Uruguay. Illustration: Anal. Mus. Nac. Montevideo s: pl. 35. 168. Opuntia mieckleyi Schumann, Bliihende Kakteen 1: pl. 44. 1903. Plant erect, much branched; joints narrowly oblong, 15 to 25 cm. long, 4 to 6 cm. broad, glab- rous, dark green, darker below the areoles; tubercles rather prominent; leaves small; areoles large, filled with white wool; spines, when present, 1 or 2, very short (5 mm. long), dark-colored; flower- buds obtuse; flowers brick-red, 6 cm. broad; petals irregularly notched; ovary spineless. Type locality: In Paraguay. Distribution: Paraguay; Estancia Loma, in San Salvador. Named for W. Mieckley, gardener in the Berlin Botanical Garden. Illustration: Blithende Kakteen 1: pl. 44. 169. Opuntia bonaerensis Spegazzini, Contr. Fl. Tandil 18. 1904. Opuntia chakensis Spegazzini, Anal. Mus. Nac. III. 4: 519. 1905. Two meters high, very much branched; joints spatulate to elliptic-spatulate, 15 to 25 cm. long, green, spines wanting or one, short; flowers orange, large, 4 cm. long; fruit obconic, 6 to 7 cm. long, dull purple; seeds 5 to 6 mm. long, subglobose. Type locality: Sierra de Curamalal, Argentina. Distribution: Argentina and perhaps Paraguay. Opuntia paraguayensis Schumann (Monatsschr. Kakteenk. 9: 149. 1899) accord- ing to Spegazzini, and if so this name would supplant O. bonaerensis. [llustration: Anal. Mus. Nac. Montevideo 5: pl. 23. The three following, known to us only from descriptions, may belong to this series. OPUNTIA STENARTHRA Schumann, Monatsschr. Kakteenk. 9: 149. 1899. Shrubby, erect or decumbent, creeping over stones or ascending trees; joints thin, narrow, yellowish green, oblong to lanceolate, rounded at base, glabrous; spines either wanting or 1 to 3 from an areole, stoutish, subangular; flowers yellow; seeds woolly. Type locality: Estancia Tagatiya, Paraguay. Distribution: Paraguay. OPUNTIA. 159 OPUNTIA ASSUMPTIONIS Schumann, Monatsschr. Kakteenk. 9: 153. 1899. Erect, 1 meter high; joints obovate, narrowed at base, thickish; spines at areoles on the faces of the joints none, but on the edges 1 or 2, stout, subulate, the upper one stouter, 3 to 4.5 cm. long; flower 3.5 cm. long, lemon-yellow; fruit pear-shaped, with a deep umbilicus; seeds densely villous. Type locality: Ascuncién, Paraguay. Distribution: Known only from the type locality. OPUNTIA CANTERAI Arechavaleta, Anal. Mus. Nac. Montevideo 5: 278. 1905. Stems erect, branching, 5 to 10 dm. high; joints elongated, shining green, attenuate below, 15 to 20 cm. long, 4 to 6 cm. broad; areoles orbicular, when young each surrounded by a violet spot, mostly spineless, about 4 cm. apart; spines, when present, 1 or 2 from an areole, 1.5 to 2 cm. long, whitish, with brownish tips; flowers orange-colored, 4 to 4.5 cm. broad; stigma-lobes 6. or 7, light flesh-colored; fruit somewhat pear-shaped, 5 cm. long;.seeds flattened. Type locality: In Uruguay. Distribution: Along the coast of Uruguay. In Uruguay this species flowers in January and Feb- ruary. Series 14. SCHEERIANAE. A single bushy species, with broad, thin, persistent joints, the areoles close together, each bearing several yellow, acicular spines and long white or yellow hairs. Its home is unknown. 170. Opuntia scheeri Weber, Dict. Hort. Bois 895. 1898. About 1 meter high, branching at base, the lower branches sprawling over the ground; joints oblong to orbicular, 1.5 to 3 dm. long, bluish green; areoles circular, elevated, filled with short brown wool; spines 10 to 12, yellow, acicular, each sur- rounded by a row of long white or yellow hairs; flowers large, pale yellow, but in age salmon-colored; stigma-lobes deep green; fruit globular, red, juicy, truncate; seed small, 4 mm. broad, with a broad irregular margin. Type locality: In Mexico. Distribution: Mexico, but known to us only from Fic. 198.—Opuntia scheeri. Xo.5. cultivated specimens. : This is a very beautiful species, covered as it is by yellow spines and long hairs. A fine plant is growing in the open at La Mortola, Italy. The seedlings produce a long mass of soft white hairs almost covering the joints and giving an appearance very different from the adult plant. In this young stage, according to Mr. Alwin Berger, they readily pass for Opuntia senilis (O. crinifera). Figure 198 represents a joint from a specimen sen Series 15. DILLENIANAE. i i i joi llow spines which are Mostly bushy or tall species, with large, flat, persistent joints, and ye sometimes brown at base, some species spineless or nearly so. We recognize thirteen species as composing the series, but many more have been described. The plants inhabit the southern Unitec States, the West Indies, Mexico, and northern South America. Key TO SPECIES. t from La Mortola, Italy, in 1912. Spines nearly setaceous, most of them reflexed.. 0... 0-e cere etree eee entrees serene 171. O. chlorotica Spines, when present, acicular to subulate. Joints spineless, or with only 1 or 2 spines a Corolla rotate; petals yellow. Plant tall; spines, when present, 2 cm. long or le . Plant depressed, bushy or spreading ; spines, when present, u Corolla cup-shaped; petals salmon ....--- +s -0t ee pu J oints usually manifestly spiny ; spine a ines mostly stout, commonly flattened .....------7-"° Spines acicular to subulate, terete, or slightly flattened at the base. t some of the areoles, or spines very short. 172. O. laevis 173. O. stricta — 173a. O. keyensts SS. ce cece eee nee p to 7em.long.... 174. O. dillenti 160 THE CACTACEAE. Joints elongated-lanceolate or oblong, several times longer than wide........... 175. O. lingutformis Joints obovate to suborbicular. Spines long. Areoles mostly 1.5 to 2 cm. apart. Spines subulate, up to 7.5 cm. long......................00-. Dk. 176. O. tapona Spines acicular, 4 cm. long or less. Spines nearly clear yellow, short................. 00000202 e eee 177. O. littoralis Spines brown at base, long and slender.....................00.5 178. O. aciculata Areoles mostly 2.5 to 4 cm. apart. Bushy species. Spines yellow or yellowish brown....................0000 0000s 179. O. lindheimeri Spines pale yellow or whitish.............. 0.000.000. e ee eee 180. O. cantabrigiensts Depressed or procumbent plant..........0.0 20.0... c cee eee ees 181. O. procumbens Spines only 1.5 cm. long or less, or becoming longer on old joints. Plant 1 meter high or less; joints thin. ..... 2.0.0... 0.000. e eee eee eee 182. O. catiada Plant 3 to 5 meters high; joints very thick. Spines reflexed; flowers yellow.........0..0.0..5.0 cece e eee eee 183. O. pyriformis Spines spreading, deciduous; flowers orange-red..................... 183a. O. bonplandii 171. Opuntia chlorotica Engelmann and Bigelow, Proc. Amer. Acad. 3: 291. 1856. Opuntia tidballit Bigelow, Pac. R. Rep. 4: 11. 1856. Opuntia curvospina Griffiths, Bull. Torr. Club 43: 88. 1916. Erect bushy, sometimes 2 meters high or more, with a definite trunk; main branches nearly erect; joints ovate to orbicular, sometimes broader than long, 15 to 20 cm. long, more or less glau- cous, bluish green; leaves subulate, small, reddish at tip; areoles closely set, prominent; spines yellow, several, most of them usually appressed and reflexed, setaceous, 3 to 4 cm. long; glochids yellow, numerous, elongated, persistent; flowers yellow, 6 to 7.5 cm. broad; filaments, white; fruit purple without, green within, 4 cm. long; seeds small. Fic. 199.—Opuntia chlorotica. Fic. 200.—Opuntia chlorotica. X0o.4. Type locality: On both sides of the Colorad ; , - My vaeeats o from S - waters of Bill Williams River. an Francisco Mountains to head reeriution® Sonora, and New Mexico to Nevada, California, and Lower California. 1S species 1s of wide distribution, but is chiefly confi . : rarely found on the open mesas. y confined to mountain canyons, being Illustrations: Bull. Torr. Club 43: pl. 3: . : > pl. 3; Pac. R. Rep. a: pl. . . . Torr. Club 43: pl. 2, this last as Opuntia curvos pina. “P- 4% pl. 6, I. x to 3; Bull. to BRITTON AND ROSE M. E. Eaton dei. i Flowering joint of Opuntia lac 3. Upper part of flowering ULS » joint of Opunita aciculata. a. Flowering joint of Opuntia dillenit. (All natural size.) OPUNTIA. 161 Figure 199 is from a photograph of a plant with narrow joints, in McCleary’s Canyon, . Santa Rita Mountains, Arizona, taken by Dr. MacDougal; figure 200 represents a joint of a plant from the collection made by Professor J. W. Toumey at Tucson, Arizona, obtained by Dr. MacDougal in 1902. OPUNTIA PALMERI Engelmann in Coulter, Contr. U. 5. Nat. Herb. 3: 423. 1896. This plant has not been again collected and is still a doubtful species; it came from St. George, southwestern Utah. In 1909 E. W. Nelson made a collection for us in this region, but the only shrubby, juicy-fruited species which he collected has brown spines and brown glochids, which would seem to exclude it from O. palmeri. It is not at all unlikely that O. palmeri should be referred to O. chlorotica, a widely dispersed species, but of which we have not seen any specimens from Utah. o _+472. Opuntia laevis Coulter, Contr. U. S. Nat. Herb. 3: 419. 1896. Loosely few-branched, 1 to 2 meters high, but in cultivation often forming a low, dense bush; joints obovate to oblong, 1.5 to 3 dm. long, light green, often spineless but usually with a few (1 to 3) short spines 1 cm. long or less at the areoles of the upper part of the joint; areoles rather distant, small; flower large, 6 to 7 cm. broad; petals lemon-yellow, sometimes tinged with red, broad, and obtuse or retuse; filaments and style short, pale yellow; stigma-lobes green; ovary turbinate, more or less tuberculate, at first leafy, often bristly at top; fruit obovoid, 5 to 7 cm. long; seeds 4 to 5 mm. broad. Type locality: In Arizona. Distribution: In the mountains about Tucson, Arizona. Referred by Professor Schumann to O. inermis (O. stricta), but it is not that species. Illustrations: Ariz. Agr. Exp. Sta. Bull. 67: pl. 8, f. 1; N. Mex. Agr. Exp. Sta. Bull. 72: pl. 1; Plant World 11'°: f. 5. Plate xxviu1, figure 1, represents a flowering joint of a plant brought by Dr. Mac- Dougal from Tucson, Arizona, in 1902, to the New York Botanical Garden. 7? 173. Opuntia stricta Haworth, Syn. Pl. Succ. 191. 1812. Cactus opuntia inermis De Candolle, Pl. Succ. Hist. 2: pl. 138 [C]. 1799.* Cactus strictus Haworth, Misc. Nat. 188. 1803. Opuntia inermis De Candolle, Prodr. 3: 473. 1828. Opuntia airampo Philippi, Anal. Univ. Chile 85: 492. 1894. Opuntia parva Berger, Hort. Mortol. i I. oe: ; ; ii Gri . _ Bot. Gard. 22: 25. 1912. _ Opuntia bentonite Onmths, Bull, Torr. Club 43: 525. 1916 (according to description and illustration). Bushy, low, spreading plants, sometimes forming large clumps, seldom over 8 dm. high; joints but sometimes much elongated and then 30 cm. long obovate to oblong, usually 8 to 15 cm. long, . . : Or more, green or bluish green, glabrous, often spineless especially in greenhouse See ens late, times but a spine or two on a joint, at other times spines more abundant, leaves stout, subu ae 3 to 4 mm. long; areoles distant, the wool brownish, the glochids short, spines, when present, usually i ; . long; petals yellow, I or 2 from an areole, stiff, terete, yellow, ! to 4 cm. long; flowers 6 to 7 cm. I¢ broad, obtuse, apiculate; filaments yellow to greenish; style usually white; stigma-lopes usualy white but sometimes greenish; fruit purple, usually broadest at top, tapering to a slender base, 4 to 6 cm. long, with a more or less depressed umbilicus. Type locality: Not given. Distribution: Western Cuba; Florida to southern Texas. -— civen by Weber as Opuntia vulgaris balearica Weber (Dict. Hort. Bors 894. 1898) is given OY teen a synonym of O. inermis; Opuntia balearica Weber (Hirscht, Monatsschr. Kakteenk 8: 175. 1898) has also been used, but not described, and Hirscht says it belongs ere. on This species is often cultivated on the west coast of South America. twas " cre given the name O. airampo by Dr. Philippi, who supposed it to be the airampo of the Peru vians, a native species, quite different from this one. land This species is the pest pear of New South Wales and Queensland. wild over thousands of acres of the best agricultural and grazing land of the interior of (Hort. Mortol. 411. 1912) gives the dat It has now run e 1797. *Berger 797 SR ee ee! el ‘4 OPUNTIA. 161 Figure 199 is from a photograph of a plant with narrow joints, in McCleary’s Canyon, . Santa Rita Mountains, Arizona, taken by Dr. MacDougal; figure 200 represents a joint of a plant from the collection made by Professor J. W. Toumey at Tucson, Arizona, obtained by Dr. MacDougal in 1902. OPUNTIA PALMERI Engelmann in Coulter, Contr. U.S. Nat. Herb. 3: 423. 1896. This plant has not been again collected and is still a doubtful species; it came from St. George, southwestern Utah. In 1909 E. W. Nelson made a collection for us in this region, but the only shrubby, juicy-fruited species which he collected has brown spines and brown glochids, which would seem to exclude it from O. palmert. It is not at all unlikely that O. palmeri should be referred to O. chlorotica, a widely dispersed species, but of which we have not seen any specimens from Utah. 1472. Opuntia laevis Coulter, Contr. U.S. Nat. Herb. 3: 419. 1896. Loosely few-branched, 1 to 2 meters high, but in cultivation often forming a low, dense bush; joints obovate to oblong, 1.5 to 3 dm. long, light green, often spineless but usually with a few (1 to 3) short spines 1 cm. long or less at the areoles of the upper part of the joint; areoles rather distant, small; flower large, 6 to 7 cm. broad; petals lemon-yellow, sometimes tinged with red, broad, and obtuse or retuse; filaments and style short, pale yeilow; stigma-lobes green; ovary turbinate, more or less tuberculate, at first leafy, often bristly at top; fruit obovoid, 5 to 7 cm. long; seeds 4 to 5 mm. broad. Type locality: In Arizona. Distribution: In the mountains about Tucson, Arizona. Referred by Professor Schumann to O. inermis (O. stricta), but it is not that species. Illustrations: Ariz. Agr. Exp. Sta. Bull. 67: pl. 8, f. 1; N. Mex. Agr. Exp. Sta. Bull. 72: pl. 1; Plant World 11": f. 5. Plate xxviu, figure 1, represents a Dougal from Tucson, Arizona, in 1902, to the Ne 173. Opuntia stricta Haworth, Syn. Pl. Succ. 191. 1812. Cactus opuntia inermis De Candolle, Pl. Succ. Hist. 2: pl. 138 [C]. 1799.* Cactus strictus Haworth, Misc. Nat. 188. 1803. Opuntia inermis De Candolle, Prodr. 3: 473. 1828. Opuntia airampo Philippi, Anal. Univ. Chile 85: 492. 1894. Opuntia parva Berger, Hort. Mortol. 41 I. one: ; 1t Gri . Mo. Bot. Gard. 22: 25. 1912. _ Opuntio lonavelads Gumths Baill Torr. Club 43: 525. 1916 (according to description and illustration). Bushy, low, spreading plants, sometimes forming large clumps, seldom over 8 dm. high; joints obovate to oblong, usually 8 to 15 cm. long, but sometimes much elongated and then 30 cm. long or more, green or bluish green, glabrous, often spineless especially in greenhouse specimens, some- times but a spine or two on a joint, at other times spines more abundant; leaves stout, subu at e 3 to 4 mm. long; areoles distant, the wool brownish, the glochids short; spines, when presen usa y I or 2 from an areole, stiff, terete, yellow, 1 to 4 cm. long; flowers 6 to 7 cm. long; ee s ye on broad, obtuse, apiculate; filaments yellow to greenish; style usually white; stigma-l es usta y white but sometimes greenish; fruit purple, usually broadest at top, tapering to a slender base, 4 to 6 cm. long, with a more or less depressed umbilicus. flowering joint of a plant brought by Dr. Mac- w York Botanical Garden. Type locality: Not given. Distribution: Western Cuba; Florida to southern Texas. —— Web Opuntia vulgaris balearica Weber (Dict. Hort. Bots 894. 1898) is given oe € i. 3. a synonym of O. inermis; Opuntia balearica Weber (Hirscht, Monatsschr. he eenik. 9° 175. 1898) has also been used, but not described, and Hirscht says it belongs ere. tt This species is often cultivated on the west coast of South America. rt was to given the name O. airampo by Dr. Philippi, who supposed it to be the airampo of the Peru- vians, a native species, quite different from this one. This species is the pest pear of New South Wales and Queensland. It has now run wild over thousands of acres of the best agricultural and grazing land of the interior of *Berger (Hort. Mortol. 411. 1912) gives the date 1797. 162 THE CACTACEAE. Australia. J. H. Maiden says: ‘‘The growth of this Opuntia is one of the wonders of the world, and the spread of few plants in any country can be compared with it.”’ Illustrations: Dept. Agr. N.S. W. Misc. Publ. 253: pl. [5]; Gard. Chron. III. 34: f. 32; Gartenflora 31: pl. 1082, f. d, e, f; De Candolle, Pl. Succ. Hist. 2: pl. 138 [C]; De Tussac, F'. Antill. 2: pl. 34, the last two as Cactus opuntia inermis; Agr. Gaz. N.S. W. 23: pl. opp. 713; pl. opp. 714; pl. opp. 716; Blithende Kakteen 2: pl. 108, all these as Opuntia inermis. Plate xxvil, figure 4, represents a flowering joint of the plant collected by Dr. Brit- ton and John F. Cowell on limestone rocks near Pinar del Rio, Cuba, in 1911. 173a. Opuntia keyensis Britton. (See Appendix, p. 222.) 174. Opuntia dillenii (Ker-Gawler) Haworth, Suppl. Pl. Succ. 79. 1819. Cactus dillenit Ker-Gawler, Edwards’s Bot. Reg. 3: pl. 255. 1818. Opuntia horrida Salm-Dyck in De Candolle, Prodr. 3: 472. 1828. Opuntia maritima Rafinesque, Atl. Journ. 146. 1832. Opuntia tunoidea Gibbes, Proc. Elliott Soc. Nat. Hist. 1: 272. 1859. Fic. 201.—Opuntia dillenii, Antigua, West Indies. Low, spreading bushes growing in broad clumps and often forming dense thickets, or tall and much branched, 2 to 3 meters high, sometimes with definite terete trunks; joints obovate to oblong, 7 to 40 cm. long, the margin more or less undulate, bluish green, somewhat glaucous, but bright green when young, the areoles somewhat elevated; leaves subulate, curved backward, 5 mm. long; areoles often large, filled with short brown or white wool when young, usually few and remote, on old joints ro to 12 mm. in diameter: spines often ro from an areole on first-year joints, very variable, usually more or less flattened and curved, sometimes terete and straight, yellow more or less brown- banded, or mottled, often brownish in age, sometimes 7 cm. long, but usually shorter, sometimes few or none; glochids numerous, yellow; wool in areoles short, sometimes brown, sometimes white; flowers in the typical form lemon-yellow, in some forms red from the first, 7 to 8 cm. long; petals broadly obovate, 4 to 5 cm. long; filaments greenish yellow; style thick white; stigma-lobes white; fruit pear-shaped to subglobose, narrowed at base, 5 to 7.5 cm. long, purplish, spineless, juicy. Type locality: Based on Dillenius’s illustration. Distribution : Coasts of South Carolina, Florida, Bermuda, the West Indies, east coast of Mexico, and northern South America; extending inland in Cuba. BRITTON AND ROSE PLATE XXIX _ View of Opuntia keyensts. View of Opuntia dillenit. I 2 OPUNTIA. 163 This species is composed: of many races varying greatly in habit, character and number of spines, shape of joints, and color of flowers. Brother Leén has sent us specimens of several individually quite different plants which inhabit hilltops in Cuba. Opuntia lucayana Britton (Bull. N. Y. Bot. Gard. 4: 141. 1906), inhabiting Grand Turk Island, Bahamas, differs in having elongated, often narrowly oblong joints 2 to 4 times as long as wide and many elongated, little-flattened spines. It grows with Opuntia dillentt and O. nashi1, and is believed to be a hybrid with these species as parents. A closely similar plant was observed on Buck Island, St. Thomas, Danish West Indies, growing immediately with O. dillenit and O. rubescens, the hybrid nature of which was unmistakable, and similar plants were seen also on Antigua, British West Indies. Opuntia cubensis Britton and Rose (Torreya 12: 14. 1912), observed in a valley near the southern coast of Cuba at Guantanamo Bay, differs in having narrower joints, rather readily separable and smaller flowers, its stout spines little flattened. It grows near colonies of Opuntia dillenii and O. militaris, and is probably a hybrid between them. Reference has already been made to the possible hybrid origin of Opuntia antillana, with O. dillenii as one of its parents. (See p. 115). Two varieties of Opuntia dillenii are given by name only; minor Salm-Dyck (Hort. Dyck. 185. 1834); orbiculata Salm-Dyck (Cact. Hort. Dyck. 1849. 67. 1850). Opuntia gilvua Berger (Hort. Mortol. 233. 1912) is unpublished. The name was ap- plied to a specimen collected by Carl F. Baker in Cuba in 1907, and has been distributed under this name. It is only a form of this very variable species. The plant is hardy on the Gulf coast of the United States and in southern California. It is widely distributed through cultivation in the warmer parts of the Old World, being a ‘‘pest pear” in southern India and in Australia; it is used for hedges in Teneriffe, and is common along the sea on Grand Canary Island. On Bermuda, when growing in shade, the plant is often spineless, and its joints elongate sometimes to a length of 3 dm., while only 6 or 7 cm. wide. This elongation of the joints also appears in plants from Florida. Illustrations: Edwards's Bot. Reg. 3: pl. 255, as Cactus dillenii; Rep. Mo. Bot. Gard. 22: pl. 1, 2, both these as Opuntia bentonii; Dillenius, Hort. Elth. 2: pl. 296, this as Tuna major, etc.; Amer. Journ. Pharm. 68: pl. opp. 169, as Opuntia vulgaris ; Descourtilz, Fl. Med. Antill. 7: pl. 513, this as Cactus opuntia. Abh. Bayer. Akad. Wiss. Miinchen 2: pl. 3, f. 7 (2); Amer. Garden 11: 473 (2); Cycl. Amer. Hort. Bailey 3: f. 1545; 1546; Cact. Journ. 1: 154 (?); Dept. Agr. N. S. W. Misc. Publ. 253: pl. [2]; Dict. Gard. Nicholson 2: f. 757; W. Watson, Cact. Cult. f. 86, all these as Opuntia tuna; Journ. N. Y. Bot. Gard. ro: f. 26, this as Opun- tia inermis; Loudon, Encycl. Pl. ed. 3. f. 6878, this as Cactus tuna; Britton, Fl. Bermuda 255. Plate xxvit, figure 2, represents a flowering joint of a plant collected in 1901 by N. L. Britton and J. F. Cowell on the Island St. Martin, West Indies; plate xxIXx, figure 1, 1s from a photograph of the related Opuntia keyensis growing on Boot Key, Florida, taken by Marshall A. Howe in 1909; figure 2 is from a photograph of the plant on Bermuda, obtained by Dr. Britton in 1912. Figure 201 is from a photograph of the plant growing on Antigua, British West Indies, taken by Paul G. Russell in 1913. “175, Opuntia linguiformis Griffiths, Rep. Mo. Bot. Gard. 19: 270. 1908. A bushy plant, 1 meter high or more, joints elongated, oblong to ovate-oblong or lanceolate, i i le green and slightly glaucous, 2 to 5 dm. long or even more, often several times longer than wide, pa . : leaves 6 mm. ong terete; spines yellow, very slender, terete or nearly so; areoles filled w ith brown wool; flowers yellow 7 to 8 cm. broad; petals broad; filaments white or greenish at pase stigma: lobes 9, green; ovary bearing numerous long glochids at the upper areoles; fruit reddish purple; seeds 3 or 4 mm. broad, acute on the back. Type locality: Near San Antonio, Texas. . Distribution: Southern Texas, in the vicinity of San Antonio. 164 THE CACTACEAE. This plant is rather common in cultivation in the Southwest and is now found in most cactus collections. According to Dr. Griffiths, it is occasionally found wild near San Antonio. We have seen somewhat similar plants from near Brownsville, Texas, probably referable to one of the races of Opuntia lindheimert. On account of the shape of the joints, this species is commonly called cow’s tongue or lengua de vaca. Illustration: Rep. Mo. Bot. Gard. 19: pl. 27, lower figure. Plate xxx represents a flowering joint of a plant obtained by Dr. MacDougal from the collection of Professor J. W. Toumey at Tucson, Arizona, for the New York Botani- cal Garden in 1902. 176. Opuntia tapona Engelmann in Coulter, Contr. U. S. Nat. Herb. 3: 423. 1896. Low, spreading plants rarely over 6 dm. high; joints glabrous, orbicular to obovate, 20 to 25 cm in diameter, turgid, pale green; spines 2 to 4, yellow, one much longer, 5 to 7 cm. long, slender, porrect or sometimes curved downward; glochids brownish; fruit 4 to 6 cm. long, clavate, dark purple without, red within, spineless. Type locality: Near Loreto, Lower California. Distribution: Southern part of Lower California. Figure 202 represents a joint of the plant collected by Dr. Rose on Pichilinque Island, Lower California, in 1911. Related to O. tapona, but probably specifically distinct from it, is a plant growing in the mountains of Cedros Island, Lower California; it was recorded from this island by Dr. E. L. Greene as O. engelmannii, and a specimen was brought to Washington by Dr. Rose in 1911. This plant may be described as follows: About 1 meter high; joints ob- long, large, 20 cm. long or more, smooth; areoles 3 cm. apart or more, very large, filled with brown wool; spines usually about 7, pale yellow, slender, terete, the longest ones 3 em.long; glochids yellow. (Rose No. 16170.) IG. 202 puntia tapona. Xo.4. Fic. 203.—Opuntia littoralis. M. E. Eaton del. ae i. Flowering joint of Opuntia (Natural size.) lingutformis. OPUNTIA. 165 7 177. Opuntia littoralis (Engelmann) Cockerell, Bull. South. Calif. Acad. 4:15. 1905. Opuntia engelmannii littoralis Engelmann in Brewer and Watson, Bot. Calif. 1: 248. 1876. Opuntia lindheimeri littoralis Coulter, Contr. U. S. Nat. Herb. 3: 422. 1896. Bushy plants, low and spreading; joints thick, orbicular to oblong, 15 cm. long or more, usually smaller in greenhouse plants, dull green; areoles rather closely set, large, often elevated on old joints; spines numerous, yellow, rather short on young joints (1 to 2 cm. long), but on old joints much longer, in age more or less flattened; wool of the areoles brown; flowers large, yellow, 8 to 12 cm. broad; sepals broad, apiculate; petals retuse; ovary with many areoles; fruit red, juicy; seeds 4 to 5 mm. in diameter. Type locality: Coast from Santa Barbara to San Diego, California. Distribution: Along and near the coast of southern California. This species was very briefly described as a variety of Opuntia engelmannii in 1876. No definite locality was given for it, and the original material preserved is so poor that its identification is doubtful. We have taken as our representative of this species the low, bushy plant with rather thick joints, large and closely set areoles and yellow spines. Opuntia littoralis often grows in proximity to O. occidentalis in southern California, and hybrids of the two may exist. Figure 203 represents joints of the plant collected at Elsinore, California, by Dr. MacDougal in 1913. 178. Opuntia aciculata Griffiths, Proc. Biol. Soc. Washington 29: 10. 1916. Low, bushy plant, 1 meter high or more, often 3 meters broad or more, the lower branches decumbent and sending up erect branches; joints obovate, 12 to 20 cm. long, rounded at apex, dull dark green, somewhat glaucous, bearing large, closely set areoles, these often spineless; leaves subulate, 7 mm. long; spines several in a cluster, acicular, slender, 3 to 5.5 cm. long, often reflexed, brownish at base, with yellow tips, seemingly deciduous; glochids numerous, from all parts of the areoles, long, persisting for several years; flower golden yellow, sometimes with a greenish center, large, 8 to 10 cm. broad; petals broad, rounded or retuse; filaments yellowish; style dull yellowish green; stigma-lobes 8 to 10, green; fruit pyriform, purple. Type locality: Near Laredo, Texas. _ Distribution: On high gravelly ground at type locality and vicinity. — This species is not very common about Laredo, Texas, but grows in small colonies usually to the exclusion of all other plants. It can easily be distinguished from related species, and is usually restricted to dry hills. Our description is based on specimens ob- tained by Dr. Rose at Laredo in 1913. Since then it has been grown both in Washington and New York. Plate xxvii, figure 3, represents a flowering joint of the plant collected by Dr. Rose néar the type locality in 1913. — ; ; \. 179. Opuntia lindheimeri Engelmann, Bost. Journ. Nat. Hist. 6: 207. 1850. Opuntia dulcis Engelmann, Proc. Amer. Acad. 3: 291. _ 1856. Obuntia lindheimeri dulcis Coulter, Contr. U. S. Nat. Herb. 3: 421. 1896. Opuntia engelmannii dulcis Schumann, Gesamtb. Kakteen 725. 1898. Opuntia cacanapa Griffiths and Hare, N. Mex. Agr. Exp. Sta. Bull. 60: 47. 1906. Opuntia ferruginispina Griffiths, Rep. Mo. Bot. Gard. 19: 267. 1908. Opuntia tricolor Griffiths, Rep. Mo. Bot. Gard. 20: 85. 1909. Opuntia texana Griffiths, Rep. Mo. Bot. Gard. 20: 92. 1909. , Opuntia subarmata Griffiths, Rep. Mo. Bot. Gard. 20: 94. 1909. Opuntia alta Griffiths, Rep. Mo. Bot. Gard. 21: 165. 1910. Opuntia gomei Griffiths, Rep. Mo. Bot. Gard. 21: 167. 1910. Opuntia sinclairii Griffiths, Rep. Mo. Bot. Gard. 21: 173. 1910. Opuntia cyanella Griffiths, Rep. Mo. Bot. Gard. 22: 30. 1912. > Opuntia gilvoalba Griffiths, Rep. Mo. Bot. Gard. 22: 35. 1912. Opuntia convexa Mackensen, Bull. Torr. Club 39: 290. 1912. Opuntia griffithsiana Mackensen, Bull. Torr. Club 39: 291. 1912. Opuntia reflexa Mackensen, Bull. Torr. Club 39: 292. 1912. Opuntia deltica Griffiths, Bull. Torr. Club 43: 84. 1916. Opuntia laxiflora Griffiths, Bull. Torr. Club 43: 85. 1916. Opuntia flexospina Griffiths, Bull. Torr. Club 43: 87. 1916. Opuntia squarrosa Griffiths, Bull. Torr. Club 43: 91. 1916. 166 THE CACTACEAE. Usually erect, 2 to 4 meters high, with a more or less definite trunk, but at times much lower and spreading; joints green or bluish green, somewhat glaucous, orbicular to obovate, up to 25 dm. long; leaves subulate, 3 to 4 mm. long, somewhat flattened, pointed; areoles distant, often 6 cm. apart; spines usually 1 to 6, often only 2, one porrect and 4 cm. long or more, the others somewhat shorter and only slightly spreading, pale yellow to nearly white, sometimes brownish or blackish at base, or some plants spineless; glochids yellow or sometimes brownish, usually prominent; petals yellow to dark red; stigma-lobes usually green; fruit purple, pyriform to oblong, 3.5 to 5.5 cm. long. Type locality: About New Braunfels, Texas. Distribution: Southwestern Louisiana, southeastern Texas, and Tamaulipas, Mexico. Opuntia lindheimert is an extremely variable species, composed of many races, differing in armament, color of flowers, size and shape of joints and of fruit. Certain forms have been described which in cultivation we have been able to recognize as possibly distinct; but in the field they seem to intergrade with other forms, indicating that they are at most only races of a very variable species. In the delta of the Rio Grande this is especially true, and from this region a number of species has been described. In fact, all the plants described as species which are cited above in the synonymy grow within a relatively small distributional area. Dr. Rose has examined all this region and is of the opinion that only one species of this series exists there, and this we believe is to be referred to Opuntia lind- heimert. It is very common about Brownsville and Corpus Christi, where it forms thickets covering thousands of acres of land. It is very variable in habit, being either low and widely spreading or becoming tall and tree-like, sometimes 3 meters high, with a definite cylin- dric trunk. Plants from these two extremes, if studied apart from the field, might be con- sidered as different species, but in the field one sees innumerable intergrading forms. The low, prostrate forms gradually pass into others with more or less erect or ascending branches, while the large tree-like forms often bear large lateral branches which lie prostrate on the ground, indicating that they have developed from the prostrate ones. Decided differences in the flower colors have been pointed out in the original descriptions, and we have observed them in greenhouse specimens, but they do not correlate with other characters. Opuntia ellisiana Griffiths (Rep. Mo. Bot. Gard. 21: 170. pl. 25. 1910), an unarmed species, is known only from cultivated plants. Dr. Griffiths states that it is quite different from the Ficus-indicue series, which it much resembles, and is quite hardy in southern Texas. It may be a spineless race of the common O. lindheimeri of this region. Opuntia pyrocarpa Griffiths (Bull. Torr. Club 43: 90. 1916) we do not know;; in its long pyriform fruit it suggests this plant; the type comes from Marble Falls, Texas. O. winteriana Berger and O. haematocarpa Berger (Bot. Jahrb. Engler 36: 455 and 456. 1905) are of this relationship, but have browner spines than is usual in the species. Opuntia leptocarpa Mackensen (Bull. Torr. Club 38: I4I. 1911), characterized by its low, bushy habit and elongated, almost abnormal fruits, suggests a natural hybrid between O. lindheimert and O. macrorhiza. Indeed, Mr. Mackensen described the species as inter- mediate between these two, and all three species are often found growing together. 0. leptocarpa originally came from San Antonio, Texas. Illustrations: Ann. Rep. Smiths. Inst. 1911: pl. 3, 4, B; Cact. Mex. Bound. pl. 75, f. 5 to 7; Karsten, Deutsch. F1. f. 501. 13, 13%, 135; N. Mex. Agr. Exp. Sta. Bull. 78: pl. [13, 14], all as Opuntia dulcis. Bull. U.S. Dept. Agr. 31: pl. 3, f. 1, this as Opuntia cacanapa; Rep. Mo. Bot. Gard. 20: pl. 4, in part, this as Opuntia tricolor; Rep. Mo. Bot. Gard. 20: pl. 9; pl. 13, f. 1, these two as Opuntia texana. Bull. U. S. Dept. Agr. 31: pl. 2, f. 1; Rep. Mo. Bot. Gard. 20: pl. 2, f. 1; pl. 11; pl. 13, f. 4, all these as Opuntia subarmata. Rep. Mo. Bot. Gard. 21: pl. 19; pl. 20, in part, these two as Opuntia alta. Rep. Mo. Bot. Gard. 21: pl. 21; pl. 22, in part, these two as Opuntia gomet. Rep. Mo. Bot. Gard. 21: pl. 28, this as Opuntia sinclairii. Rep. Mo. Bot. Gard. 22: pl. 9, in part; pl. 10; Journ. Agr. Research 4. pl. f., these three as Opuntia cyanella. Rep. Mo. Bot. Gard. 22: pl. 9, in part; pl. 16, 17, these three as Opuntia gilvoalba. Bull. U. S. Dept. Agr. 31: f. 1. : ee ee BRITTON AND ROSE M. E. Eaton del. a3 Pa Flowering joints bf Opuntia lindhermert. Orange-flowered race. 2. Red-flowered race. ‘(Natural size.) PLATE XXX! OPUNTIA. 167 Plate xxxI, figure 1, represents a flowering joint of a plant collected near Brownsville, Texas, by Dr. Rose in 1913; figure 2 represents a flowering joint of a plant obtained by the same collector at the same locality; plate xxxil, figure 1, representsa flowering joint of a plant sent by Mr. M. Mackensen from the type locality of O. leptocarpa in 1910; figure 2 shows the fruit of the same. 180. Opuntia cantabrigiensis Lynch, Gard. Chron. ITI. 33: 98. 1903. Opuntia engelmannii cuija Griffiths and Hare, N. Mex. Agr. Exp. Sta. Bull. 60: 44. 1906. Opuntia cutja Britton and Rose, Smiths. Misc. Coll. 50: 529. 1908. Rounded bushy plant, 1 to 2 meters high; joints orbicular to obovate, 12 to 20 cm. long, rather pale bluish green; areoles remote, large, filled with brown wool; spines usually 3 to 6 but sometimes more, somewhat spreading, acicular, yellow with brown or reddish bases, 1.5 to 4 cm. long; glochids numerous, large, 1 cm. long or more, yellowish, not forming a brush; flowers 5 to 6 cm. long, yel- lowish with reddish centers; upper areoles on the ovary bearing long bristles; stigma-lobes green; fruit, globular, about 4 cm. in diameter, purple; seeds numerous, small, 4 mm. in diamter. Type locality: Described from specimen in Cambridge Botanic Garden, England. Distribution: Very common in the States of San Luis Potosi, Querétaro, and Hidalgo, Mexico. Opuntia chrysacantha (Berger, Hort. Mortol. 231. 1912, name only), an undescribed species, probably belongs here. 7 Our determination of the identity of O. cantabrigiensis and O. cuija is based on a living plant of the former received from Mr. Lynch. a Illustrations: N. Mex. Agr. Exp. Sta. Bull. 60: pl. 2, as Opuntia engelmannii curja; Gard. Chron. III. 30: f. 123, as Opuntia engelmannit. — . Figure 204 represents joints of a plant collected by Dr. Rose near Ixmiquilpan, Hidalgo, Mexico, in 1905. y / Fic. 205.—O. procumbens. 0.5. 1856. Fic. 204.—O. cantabrigiensis. Xo.4. > 181. Opuntia procumbens Engelmann, Proc. Amer. Acad. 3: 292. | d masses; joints “always edgewise,”” orbicular, 2 to 4 or Stems low and spreading, forming bros mewhat glaucous; areoles distant (3 to 5 cm. apart), even 5 dm. in diameter, yellowish green, So 168 THE CACTACEAE. large, bearing long yellow glochids; spines 1 to 5, spreading, 2.5 to 5 cm. long, yellow, lighter above, flattened; flowers said to be yellow; fruit red, juicy. Type locality: San Francisco Mountains to Cactus Pass, Arizona. Distritution: Northern Arizona. ; This species has long been wanting or poorly represented in our great herbaria. Dr. Rose collected it near Flagstaff, Arizona, and the above description is largely drawn from his notes; but his material was lost. In 1913 it was again collected by Mr. E. A. Goldman. Illustration: Pac. R. Rep. 4: pl. 6, f. 4, 5. Figure 205 is copied from the illustration above cited. 2? 182. Opuntia cafiada Griffiths, Rep. Mo. Bot. Gard. 20: 90. 1909. Plant about 1 meter high, with many erect or ascending branches, forming a broad top; joints ovate to obovate, 16 to 22 cm. long, smooth, and shining; leaves subulate, 1 cm. long; spines various, white to yellow, flattened, sometimes twisted; glochids few on young joints, very abundant on old ones; flowers yellow with red or orange centers; style white to reddish; stigma-lobes green; fruit red. Type locality: Foothills of the Santa Rita Mountains, Arizona. Distribution: Southeastern Ari- zona. Dr. Griffiths comments on the close relationship of this plant to O. laevis. Illustrations: Rep. Mo. Bot. Gard. 20: pl. 2,f.6; pl. 6,in part; pl. 13,f. 2, 12. Figure 206 is copied from the second illustration above cited. 183. Opuntia pyriformis Rose, Contr. U. S. Nat. Herb. 12: 292. 1909. Plant 3 to 5 meters high, with widely spreading branches, the lower ones almost resting on the ground and 3 to 5 meters long; joints obovate, thick, 18 cm. long or more; areoles closely set, small; spines I or 2,0n old joints more, usually reflexed, slender, weak, yellow, 10 to 22 mm. long; flowers yellow; fruit 4 cm. long, some- what tuberculate, spineless, its large are- oles crowded with brown hairs forming hemispherical cushions. Type locality: Hacienda de Ce- dros, Zacatecas, Mexico. Distribution: Zacatecas, Mexico. The type of this species is in the U. S. National Herbarium. It is known only from the original collection of Professor F. E. Lloyd, made in 1908. Illustrations: Contr. U. S. Nat. Herb. 12: f. 35; pl. 26. . Figure 207 is copied from the second illustration above cited. 183 a. Opuntia bonplandii (HBK.) Weber. (See Appendix, p. 223.) Fic. 207.—Opuntia pyriformis. Xo.5. The three following described species may belong to this series: OPUNTIA BECKERIANA Schumann, Gesamtb. Kakteen 722. 18098. The plant on which this species is based was sent to Dr. Schumann from a garden at Bordighera, Italy, and its origin is unknown; Dr. Schumann thought that it might have OPUNTIA. 169 come from Mexico. From the description it may belong to our series Dillenianae, but we are unable to associate it with any species known to us; the ovary is described as com- pressed and tubercled. OPUNTIA ANAHUACENSIS Griffiths, Bull. Torr. Club 43:92. 1916. A low, reclining or prostrate plant, up to 5 dm. high, 1.5 meters broad; joints obovate, glossy, yellowish green, 27 cm. long, 13 cm. broad; spines yellow or becoming white, 1 or 2, porrect, flattened, twisted, 2 or 3 cm. long; flowers yellow; style white; stigma-lobes 6, white; fruit dark purplish red, pyriform, 7 cm. long. Type locality: Anahuac, Texas. Distribution: Known only from the type locality, at the mouth of Trinity River, eastern Texas. OPUNTIA MEGALANTHA Griffiths, Bull. Torr. Club 43: 530. 1916. A tall, erect, open-branching plant, 2 meters high or more; joints obovate, glaucous, grayish green, 21 cm. long, 14 cm. broad; spines yellow, 1 to 3, or even 5 or 6 on old wood, the longest often 4 to 5 cm. long; flowers yellow, 10 to 11 cm. in diameter; petals 5 cm. long, obovate; style white; stigma-lobes 8 or 9, white or tinged with green; fruit dark red. Known only from cultivated plants received from the Berlin Botanical Garden, where it was grown as Opuntia bergeriana. Series 16. MACDOUGALIANAE. Erect, mostly tall species, with flat, broad, and thin, persistent joints, the epidermis, at least that of the ovary, pubescent or puberulent. The spines, when present, yellow. There are about half a dozen species, natives of central and southern Mexico. Key TO SPECIES. Joints merely finely puberulent or glabrous; spines 1.5 cm. long or . less; ovary velvety ......... 184. O. durangensis Joints distinctly pubescent; spines 2 to 3 cm. long. Petals red. Style shorter than the petals 185. O. atropes Style as long as the petals: 186. O. affinis Petals yellow. Spines acicular, at first yel- . low, soon white......... 187. O. macdougaliana Spines subulate. Petals retuse; areoles of Ovary many, approxi- : mate..............- 188. O. velutina Petals mucronate; are- oles of ovary few, dis- tant............00.. 189. O. wilcoxtt 184. Opuntia durangensis Britton and_ Rose, Smiths. Misc. Coll. 50: 518. 1908. Fic. 208.—Opuntia durangensis. Xo.4. so eee coo ee eoes ot minu Pe perulent, bearing numerous areoles; areoles 1 to 16 cm. broad, pal en, glabrous or minutely p I 2 cm. apart, elevated: spines 3 to 5 at an areole, short, 1.5 cm. jong less, do Sanu ea yellow, but in age becoming darker; glochids brown, 2 to 3 mm. long; ower: yellow, 50 » long: petals broad, apiculate; ovary 3 to 4 cm. long, finely pubescent, bearing ne ous glochids and a few spines; fruit white or red; seeds about 3 mm. . Type locality: Near Durango, Mexico. Distribution: Central Mexico. This species was collected by the size and habit of the plant. Figure 208 represents a joint of the type specimen. the late Dr. E. Palmer in 1912, but he did not record The joints suggest a large, bushy species. 170 THE CACTACEAE. 185. Opuntia atropes Rose, Smiths. Misc. Coll. 50: 518. 1908. Plant 1 to 3 meters high, much branched; joints oblong to obovate, 20 to 30 cm. long, deep green, softly pubescent; young joints somewhat glossy, leaves 4 to 5 mm. long, acuminate, pubescent, standing almost at right angles to the joints, the tips reddish, areoles circular, filled with short tawny wool; young spines white or yellowish; old spines 3 to 6 cm. long, somewhat angled, standing almost at right angles to the joints, dark yellow or brown at the base, much lighter, often white above; glochids numerous, long, yellow; petals reddish; ovary pubescent, covered with large cushion- like areoles bearing long glochids near the top but with few spines or none, truncate at apex. Type locality: ava beds near Yautepec, Morelos, Mexico. Distribution: Central Mexico. 186. Opuntia affinis Griffiths, Proc. Biol. Soc. Washington 27: 27. 1914. ‘“‘A low, arborescent species, from 125 cm. high with us at 4 years of age to 2 m. or more in its natural habitat; joints obovate, 13 by 35 cm., broadly rounded above and gradually narrowed below, densely silky, villous to the touch, and villous nature plainly visible when viewed in proper light, slightly raised at areoles, the tubercles being surrounded by a sunken dark-green line; leaves small, subulate, pointed, scarcely 2mm. in length; areole small, obovate, 3 mm. long, 25 to 30 mm. apart, white to gray; spicules light straw-colored, at first not conspicuous but rather in a connivent tuft, 3 mm. long; spines absent below and 1 to 5 in upper five-sixths of joint, straw-colored, becoming white the second year, the longest 3 cm. and others much shorter, increasing in age in both length fs Fic. 209.—Opuntia macdougaliana, Tehuacdan, Mexico. OPUNTIA. 171 and numbers, at 3 years often 10 in number and some 6 cm. long, divergent, flattened, angular, twisted; flowers dull dark-red in bud, with stigma protruding the day before the petals spread, small, about 3 cm. in diameter when opened, petals 20 to 25 mm. long, slightly, when at all, recurved, ribs of petals red and wings orange, filaments greenish below and pink above, style bright- glossy red, stigma dull greenish red, 4-parted, equaling the petals in length; ovary small, subglobose, deeply pitted, 15 to 17 mm. in diameter, with small subcircular to slightly transversely elongated, dirty brown areoles, 4 mm. apart; fruit small, subglobose, red.”’ Type locality: State of Oaxaca, Mexico. Distribution: Known only from type locality. Our examination of the type specimen of this species showed that it is closely related to Opuntia macdougaliana, differing in the color of its petals, which may not be a specific character. & Fic. 210.—Opuntia macdougaliana 187. Opuntia macdougaliana Rose, Smiths. Misc. Coll. 50: 516. 1908. Opuntia micrarthra Griffiths, Monatsschr. Kakteenk. 23: 130. 1913. ; ach _ i i isti indri hing from near the base; joint: high, with a distinct cylindric trunk branch ear oblone ns about 4 earn to cm. broad, softly pubescent; areoles distinct, small; spines generally 4 one much longer rene to 4 cm. long), somewhat flattened, yellowish, becoming wa age; glochids short numerous yellow; fruit globular to oblong, 5 cm. long, the surface ivic ed into diamond-shaped plates red, with a broad deep cup at apex, the numerous small rounded ¢ filled with clumps of yellow glochids, very rarely with one or two spines. Type locality: Near Tehuacan, Mexico. Distribution: Southern Mexico. Figure 209 is from a photograph of the ty Tehuacdn, Mexico, in 1906; figure 210 represe pe plant taken by Dr. MacDougal at El Riego, nts a plant grown from a cutting of the type. 172 THE CACTACEAE. 188. Opuntia velutina Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 10: 389. 1904. Opuntia nelsonit Rose, Smiths. Misc. Coll. 50: 516. 1908. Stems 1 to 4 meters high; joints flattened, oblong to pear-shaped in outline, 15 to 20 cm. long by 10 to 15 cm. broad near the top, pubescent, pale yellowish green in herbarium specimens; areoles 2 to 3 cm. apart; spines 2 to 6, yellow, becoming white in age, very unequal, the longer ones 3 to 4 cm. long; bristles many, yellow, becoming brownish; flowers rather small; petals yellow, 1.to 3 cm. long; ovary pubescent, bearing many yellowish brown bristles; filaments red; stigma-lobes pale green; fruit “dark red.” Type locality: In Guerrero, Mexico. Distribution: Southern Mexico. Plate xxxul, figure 3, represents a flowering joint of a plant collected at Tehuacan, Mexico, by Dr. MacDougal and Dr. Rose in 1906. 189. Opuntia wilcoxii sp. nov. A tall, bushy plant, 1 to 2 meters high, very much branched; joints oblong, thinnish, large, 2 cm. long, dark green, more or less purplish about the large areoles, finely puberulent; glochids numerous, long, yellow; spines 1 to 3, one very long (5 to 6 cm. long), porrect, white or somewhat yellowish; flower, including ovary, 6 cm. long, yellow; petals oblong, mucronate; ovary bearing few large areoles, these filled with brown wool and yellow glochids; filaments short; style thick, 2 cm. long, with 10 stigma-lobes; fruit pubescent, 4 cm. long. Very common on the hills in the coastal plain of west- ern Mexico from southern Sonora to southern Sinaloa, Mexico, where it was frequently collected by Rose, Standley, and Russell in 1910; their No. 13546, with flower, from Fuerte, Sinaloa, is. selected as the type of the species. It is named for Dr. Glover B. Wilcox, who first sent in living specimens in 1909. Figure 211 represents a joint of the type specimen. To this series belong two plants which we have not been able to identify but are here briefly characterized: The first, a very peculiar species, collected by Rose, Standley, and Russell, March 14, 1910 (No. 12853), on the dry hills near Alamos, Sonora, Mexico, is unlike any of the described species. It is living both in Washington and New York, but it has not done well in cultivation. It may be described as follows: Bushy; joints oblong, thickish, pale green in color, with very short puberulence, nearly or quite spineless; glochids yellowish or greenish, numerous; young areoles brown in the center, — F16. 211.—Opuntia wilcoxii. Xo.4. white-woolly in the margin; flowers and fruit not known. Dr. H. H. Rusby collected the second species on the Balsas River, southern Mexico. It comes from the region of O. velutina, but we do not know its flowers. It may be described as follows: Joints oblong, 18 cm. long, but cultivated specimens smaller, usually obovate, dark green; spines few, short, at first white; young areoles large, bordered with white wool, bearing the spines and glochids from the center. Living specimens are growing in the New York Botanical Garden under No. 32811. Series 17. TOMENTOSAE. . Tall, erect, pubescent or puberulent species, with flat persistent joints, the spines, when present, white. We know three species, natives of Mexico and Guatemala. \ M. E. Eaton del. 1. Upper part of flowering joint of Opuntia leptocarpa. 2. Fruit of the same. 3. Flowering joint of Opuntia velutina. 4. Upper part of joint of Opuntia megacantha. (All natural size.) OPUNTIA. 173 KEY TO SPECIES. Joints narrowly obovate. Joints grayish green, densely velvety...... 000000 occ ccc cect bebe teens Joints bright green, minutely puberulent.......00000 000000 cece en Joints broadly obovate......... 00. c cette bbb b bebe bee treeeeey 190. O. tomentosa 191. O. tomentella 192. O. guilanchi 2 190. Opuntia tomentosa Salm-Dyck, Observ. Bot. 3:8. 1822. Cactus tomentosus Link, Enum. Hort. Berol. 2: 24. 1822. Opuntia oblongata Wendland in Pfeiffer, Enum. Cact. 161. 1837. Opuntia icterica Griffiths, Monatsschr. Kakteenk. 23: 138. 1913. Becoming 3 to 6 meters high or more, with a broad top and a smooth trunk 10 to 30 cm. in diameter; joints oblong to narrowly obovate, 10 to 20 cm. long, velvety pubescent, somewhat tuberculate when young; glochids yellow; spines usually wanting but sometimes 1 or more appear; flowers orange-colored, 4 to 5 cm. long; filaments white or rose-colored; style dark carmine, longer than the stamens; stigma-lobes 5 or 6, white; fruit ovoid, red, sweetish; seeds 4 mm. broad. 4 ' -. sl be a : \ or) Xd Fic. 212.—Opuntia tomentosa. Type locality: Not cited; doubtless Mexico. Distribution: Central Mexico and as an escape in Australia. . This species was first described from cultivated plants and has long been a favorite. When grown out of doors, as it is in Bermuda, it forms a large and conspicuous plant. It is usually nearly or quite spineless, but plants which come from the Valley of Mexico are often spiny. According to J. H. Maiden, this plant had been sent to him under the unpublished name Opuntia lurida, and as O. pubescens. ; . Illustrations: Agr. Gaz. N. S. W. 23: pl. opp. 1028, Monatsschr. Kakteenk. 16: 121; De Candolle, Pl. Succ. Hist. 2: pl. 137 [A, B], this last as Cactus cochenillifer (fide Berger). 174 THE CACTACEAE. Plate xxxml, figure 1, represents a fruiting joint of a plant raised from seeds received by the United States Department of Agriculture. Figure 212 is from a photograph of a plant near St. Georges, Bermuda, taken by Stewardson Brown 1n 1912. ; 191. Opuntia tomentella Berger, Monatsschr. Kakteenk. 22: 147. 1912. Bushy; joints obovate to oblong, 20 to 30 cm. long, 9 to 15 cm. broad, light green, somewhat shining, finely puberulent; areoles about 3 cm. apart, small; spines 1 or 2, acicular, white, short (7 to 10 mm. long), porrect, sometimes wanting; glochids few; flowers numerous, 5 to 6 cm. long; petals obovate, reddish yellow; filaments yellowish green; style rose-colored; stigma-lobes white; ovary tomentose, armed with numerous black glochids; fruit oblong, red, sour. Type locality: In Guatemala. Distribution: Guatemala. This species was distributed by the late F. Eichlam, who sent plants both to Washington and to La Mortola, those sent to La Mortola being used by Mr. Berger for his description. The species is perhaps near the common Mexican species O. tomentosa, but does not grow so tall, and the tomentum is not so dense nor so soft. Figure 213 represents a joint of a plant collected in Guatemala by F. Eichlam in 1909. 192. Opuntia guilanchi Griffiths, Rep. Mo. Bot. Gard. 19: 265. 1908. Becoming 1.5 to 2 meters high, often with a distinct trunk 1.5 to 2.5 cm. in diameter; joints broadly obovate, 14 to 16 cm. wide, 20 to 24 cm. long, minutely pubescent; spines at first white, slightly flat- tened, the longest 2 cm. long; glochids light yellow; fruit subglobose, 4 cm. in diameter, pubescent, variously colored, aromatic. Type locality: Near the city of Zacatecas, Mexico. Distribution: Zacatecas, Mexico. Series 18. LEUCOTRICHAE. - rar oe F : . \ lhis series is restricted to a single species. Schumann grouped as Chaetophorae, O. leucotricha with O. ursina, the latter a species with simi- lar long bristles on the stem but otherwise very different, it being dry- fruited. Opuntia leucotricha is characterized by its long, weak, hair- like or bristle-like spines on many of the joints, especially the stem and §F16- 213.—Opuntia tomentella. very old joints. The fruit of this plant is very different from that of tae related series in that the pulp is fragrant and does not come free from the rind when mature. 193. Opuntia leucotricha De Candolle, Mém. Mus. Hist. Nat. Paris 17: 119. 1828. Opuntia fulvispina Salm-Dyck in Pfeiffer, Enum. Cact. 164. 1837. Opuntia leucotricha fulvispina Weber in Schumann, Gesamtb. Kakteen Nachtr. 157. 1903. _ Often 3 to 5 meters high, with a large top; trunk as well as the older joints covered with long white bristles; joints oblong to orbicular, 1 to 2 cm. long, pubescent; areoles closely set, the upper part filled with yellow glochids, the lower part at first with only 1 to 3 weak white spines; flowers, including ovary, 4 to 5 cm. long; petals yellow, broad; ovary with numerous areoles, the upper ones bearing long, bristly glochids (1 cm. long); style red; stigma-lobes green; fruit variable, 4 to 6.cm. long, white or red, the rind not easily coming off from the pulp, aromatic, edible. Type locality: In Mexico. Distribution: Central Mexico. Opuntia erythrocentron Lemaire (Forster, Handb. Cact. 492. 1846) was given as a synonym of O. fulvispina. Opuntia leucosticta Wendland (Pfeiffer, Enum. Cact. 167, 1837) probably belongs here. Opuntia leucacantha Link and Otto (Salm-Dyck, Hort. Dyck. 362. 1834), published first in 1834—although the name occurs in literature as early as 1830 (Verh. Ver. Beford. BRITTON AND ROSE PLATE XXXili _ wate M. E. Eaton def. Flowering joint and branch of Opuntia brasiliensis. “ ae 2 Joint of Grusonia bradtiana. ztia tomentosa. Upper part of joint of Opus A. (All natural size.) 4, OPUNTIA. 175 ‘ Gartenb. 6: 434. 1830)—which was later taken up as Consolea leucacantha by Lemaire (Rev. Hort. 1862: 174. 1862), seems to belong here rather than to O. spinosissima. If it came from Mexico, as reported, it could not be O. spinosissima or any of its relatives, for none of them is known from Mexico. Opuntia subferox Schott (Pfeiffer, Enum. Cact. 167. 1837) was given as a synonym of this species, while O. leucacantha laevior Salm-Dyck (Cact. Hort. Dyck. 1844. 47. 1845) and O. leucacantha subferox Salm-Dyck (Forster, Handb. Cact. 497. 1846) were supposed to be based on O. subferox. Opuntia leucantha (De Candolle, Prodr. 3: 474. 1828), unpublished, is doubtless the same as O. leucacantha. Fic. 214.—Opuntia leucotricha. Opuntia fulvispina laevior Salm-Dyck (Pfeiffer, Enum. Cact. 164. 1837) anya of vispina badia Salm-Dyck (Cact. Hort. Dyck. 1849. 65. 1850) are given as on y 5 O. leucotricha; while O. rufescens Salm-Dyck (Porster, rand). Cact. 493. 1846) 1S g as a synonym of fulvispina laevior; all these seem to belong here. This is walled duuracnilla in Mexico. It is grown in Bermuda under the name of Aaron's Beard. Illustrations: Engler and Prantl, Pflanzenfam. 3 Bull. 60: pl. 4, f. 1, 2. . . ct Plate XXIV, figure 1, represents a flowering jomt of a plant in the collection of the New York Botanical Garden. Figure 214 is from a photograph of Ft plant grown from a cutting received from the collection of M.'Simon, St. Ouen, Paris, France, gol. 6a: f. 56, J; N. Mex. Agr. Exp. Sta. 176 THE CACTACEAE. Series 19. ORBICULATAE. We have retained the series Criniferae, although changing its name to Orbiculatae, but we have excluded O. scheeri, which was placed here by Schumann. ‘The species are characterized by long hairs produced from the areoles. The species retained in the series are not closely related; while others, like O. macrocentra, in other series, sometimes produce long hairs from the areoles in the seedling stage, and O. hyptiacantha and some other species have a few hairs at the areoles of mature joints. . KEY To SPECIES. Hairs from the areoles of young plants long and white, long-persistent; plant low.. 194. O. orbiculata y 24 aD Hairs from the areoles of young joints of old plants early deciduous; plant tall... 195. O. pilifera Ft 194. Opuntia orbiculata Salm-Dyck in Pfeiffer, Enum. Cact. 156. 1837. i Opuntia crinifera Salm-Dyck in Pfeiffer, Enum. Cact. 157. 1837. Opuntia crinifera lanigera Pfeiffer, Enum. Cact. 157. 1837. Dbued, Opuntia lanigera Salm-Dyck, Cact. Hort. Dyck. 1849. 65. 1850. -_ j A plant without a very definite trunk, about 1 meter high, often : a broader than high; joints green or bluish green, orbicular to obo- f P PP ? = vate, sometimes spatulate, about 15 cm. long; leaves subulate, 2 = to 3 mm. long; areoles small, in seedlings and young plants pro- 6 ducing long white hairs or wool long-persistent; spines acicular, Pp Va R Se several, yellow; flowers yellow. fp Type locality: Cited as Brazil, but undoubtedly by error. (, > a PP (4 Distribution: Northern Mexico. ol > Opuntia senitlis Parmenteer is given by Pfeiffer + Nae Sa (Enum. Cact. 157. 1837) as a synonym of O. crinifera, \ and O. pintadera by Salm-Dyck (Cact. Hort. Dyck. UENO U* €&3 1844. 47. 1845) aS a synonym of O. lanigera. They af ly > doubtless both belong here. | Opuntia metternichit Piccioli (Salm-Dyck, Cact. Hort. Dyck. 1844. 46. 1845) and O. orbiculata met- (HOR y ternichit Salm-Dyck (Cact. Hort. Dyck. 1849. 68. VY 1850), names without descriptions, doubtless be- 7, i) Wye aN long here. MOF 1 Wy y / J. We have studied living plants sent from the hi , an \ Berlin Botanical Garden as O. crinifera and from _ the Botanical Garden of Santiago, Chile, as O. orbic- Fic. 215.—Opuntia orbiculata. Xo0.66. ulata; the plant is not native in Chile. Illustration: Monatsschr. Kakteenk. 11: 155, as Opuntia lanigera. ; Figure 215 represents joints of a plant sent from the Berlin Botanical Garden in 1902. 195. Opuntia pilifera Weber, Dict. Hort. Bois 894. 1898. Becoming 4 to 5 meters high, with a definite, thick, woody, cylindric trunk and a broad, rounded top; joints oblong to orbicular, 1 to 3 dm. long, obtuse at apex, pale green; leaves subulate, about 5 mm. long; areoles 2 to 3 cm. apart, scarcely elevated; spines 2 to 9, white, slightly spreading, acicular; the outer part of the areole filled with nearly white, more or less deciduous hairs 2 to 3 cm. long; flowers large, red; areoles on the ovary bearing brown glochids and deciduous hairs, the latter especially abundant towards the top of the ovary; fruit red, juicy. Type locality: In Mexico. Distribution: Puebla, Mexico. No definite locality was given for this species when it was first described, and apparently no type material was preserved; living specimens identified by Weber are still grown at La Mortola, Italy. The species is common about Tehuacdn, Mexico, being one,of the large forms occurring in that region. It is common in all large greenhouse collections. sii Suge oy ‘ OPUNTIA. 177 Figure 216 is froma photograph of a plant in the collection of the New York Botanical Garden grown from a cutting brought by Dr. MacDougal and Dr. Rose from Tehuacan, Mexico, in 1906. Series 20. FICUS-INDICAE. Large plants, usually with large, nearly spineless green joints; spines, when present, few, small, white; flowers large, usually orange to yel- low. None of the species is definitely known in the wild state, but all doubtless originated from tropical American ancestors, and they may all represent spineless races of plants here included in our series Streptacanthae. Some of them are cultivated for their fruit and others for forage. KEy TO SPECIES. Joints obovate to elliptic, comparatively broad, more or less glaucous. Joints dull. Joints thin, up to 5 dm.long.. 196. O. ficus-indica Joints thick, 15 cm. long orless. 197. O. crassa Joints glossy...............0005 198. O. undulata Joints elongated, comparatively nar- row. Flowers yellow; joints somewhat tuberculate................... 199. O. lanceolata Flowers orange-red; joints not tu- . berculate.........0...0000000. 200. O. maxima 196. Opuntia ficus-indica (Linnaeus) Miller, Gard. Dict. ed. 8. No. 2. 1768. Cactus ficus-indica Linnaeus, Sp. Pl. 468. 1753 Cactus opuntia Gussone, Fl. Sic. Prodr. 559 1827-8. Not Linnaeus. Opuntia vulgaris 'Tenore, Syll. Fl. Neap. 239. 1831. Not Miller. Opuntia ficus-barbarica Berger, Monatsschr. Kakteenk. 22: 181. 1912. Large and bushy or sometimes erect and tree- Fic. 216.—Opuntia pilifera. like and then with a definite woody trunk up to 5 meters high, usually with a large top; joints oblong to spatulate-oblong, usually 3 to 5 cm. long, i ; i ; i I. dropping sometimes even larger; areoles small, usually spineless; glochids yellow, numerous, soon drop off; leaves subulate. green, 3 mm. long; flowers large, normally bright yellow, 7 to 10 cm. broad; ovary 5 cm. long; fruit normally red, edible, 5 to 9 cm. long, with a low, depressed umbilicus. itiy: Tropical America. Drvribution Native home not known, but now found all over the tropics and sub- tropics either as cultivated plants or as escapes. It is hardy in Bermuda and Florida. — This cactus is widely cultivated in all tropical and subtropical countries, where it is grown for its fruits and for forage. It has run wild in many waste places along the Mediter- ranean Sea, about the Red Sea, in southern Africa, and in Mexico. _ We have not attempted to list the many named garden varieties of this species, which are sometimes Latin and sometimes English in form. . Opuntia amyclaea ficus-indica (Berger, Monatsschr. Kakteenk. 15: 154. 1905) has never been described. The origin of this common, ppheenrre 5 oe times. We have long been convinced that it 1s a close re ' have kept it out of that series as only a matter of convenience. Mr. A. Berger believed it to be a spineless form of O. amyclaea, which is now a well-established species in certain parts of Italy. Dr. Griffiths has recently figured a reversion which appeared on the common cultivated species doubtless dates back to prehistoric of the Streptacanthae, and 178 THE CACTACEAE. spineless form which points very definitely to O. megacantha as the origin of thisform. (See Reversion in Prickly Pears, Journ. Hered. 5:.222. . 1914.) . Illustrations: Amer. Garden 11: 471; Bull. U.S. Dept. Agr. 31: pl. 1; pl. 2, f. 1; Cycl. Amer. Hort. Bailey 3: f. 1543; Dept. Agr. N.S. W. Misc. Publ. 253: pl. [1], f. 1, 33 Dict. Gard. Nicholson 2: f. 753; Dodon. Pempt. f. 10, 11; Lemaire, Cact. f. 10; Meehan’s Monthly 10: 28; Mem. Acad. Neap. 6: pl. 1, 2; Monatsschr. Kakteenk. 15: 151; W. Watson, Cact. Cult. f. 8, in part; f. 80. — . Fic 217.—Opuntia ficus-indica, Cérdoba, Argentina. Figure 217 is from a photograph of the plant growing at Cérdoba, Argentina, taken by Paul G. Russell in 1915; figure 218 represents the fruit, obtained in Bermuda by Dr. Britton in 1913. 197, Opuntia crassa Haworth, Suppl. PI. ‘Suce. 81. 1819. Opuntia parvula Salm-Dyck, Hort. Dyck. 364. 1834. Opuntia crassa major Pfeiffer, Enum. Cact. 153. 1837. Opuntia glauca Forbes, Hort. Tour Germ. 158. 1837. Plant 1 to 2 meters high, somewhat branched; joints ovate to ob- long, 8 to 12.5 cm. long, thick, bluish green, glaucous; areoles bearing brown wool and brown glochids; spines wanting or sometimes 1 or 2, acicular, 2.5 cm. long or less; flowers and fruit unknown. Type locality: Described from cultivated specimens supposed to have come from Mexico. , Distribution: Unknown in the wild state; locally found in cultivation in tropical America. Haworth, who first described this species, thought it to be near QO, stricta. Pfeiffer (Enum. Cact. 153. 1837) uses O. glaberrima Hort. Berol. as a synonym of O. crassa major. } : Fic. 218.—Fruit of Opuntia Opuntia parvula, when first published, was supposed to be ficus-indica. - X0.66. native of Chile, but this was a mistake. Salm-Dyck compared the species with O. crassa and O. spinulifera, but says it is thrice smaller than either. Schumann refers O. parvula directly to O. crassa, which disposition we follow. Figure 219 is from a photograph of a plant in the Organ Mountains, Rio de Janeiro, Brazil, taken by Paul'G. Russell in I9I5. OPUNTIA. 179 198. Opuntia undulata Griffiths, Rep. Mo. Bot. Gard. 22: 32. 1912. Opuntia undosa Griffiths, Monatsschr. Kaktenk. 23: 139. 1913. “Plant tall, large, stout, open-branching, with cylindrical trunk, often 30 cm. or more in diameter; joints very large, obovate, broadly rounded above, widest above middle, commonly 35 by 55 cm., firm, hard, quite fibrous, dished, wavy or flat, glossy light yellowish green at first, but changing through a darker green with a slight touch of glaucous to scurfy brown on old trunks; leaves subcircular in section, subulate, pointed, usually tinged with red at the tip, about 4 mm. long, upon a prominent tubercle and subtending a prominent dark-brown areole; areoles subcircular to ellipsoid or obovate, about 3.5 by 4.5 mm., gray, 5 to6 cm. apart; spicules yellow in a short, compact tuft in upper part of areole, about I mm. long, soon becoming dirty and inconspicuous; spines white, few, short,erect, flattened, straight or twisted, 10 to 15 mm. long, 1 to 3 or 4, mostly one or none; fruit large, 4 to 5 by 9 to 1ocm., dull red to slightly tinged with orange and pulp streaked with red and orange when rind is removed.” Type locality: Described from cultivated plant obtained at Aguascalientes, Mexico. Distribution: Mexico. Illustrations: Rep. Mo. Bot. Gard. 22: pl. 11, in part; pl. 12. We have doubtfully referred to this species plants coJJected by Dr. Rose on the west coast of Mexico, where they were growing wild; this is some dis- tance from the place where the type was obtained from culti- Fic. 219.—Opuntia crassa. vated plants. These speci- _ 7 _ mens are like this species in having quite glossy joints with few spines. The plants were not in bloom when seen by Dr. Rose in the spring of rgro. Dr. Griffiths has changed his first name, O. undulata, on ac tt name at an earlier time, which was not accompanied, however, by description. count of the use of that S199, Opuntia lanceolata Haworth, Syn. Pl. Succ. 192. 1812. Cactus lanceolatus Haworth, Misc. Nat. 188. 1803. ; Cactus elongatus Willdenow, Enum. Pl. Suppl. 34. ; 1813. Opuntia elongata Haworth, Suppl. PI. Succ. 81. 1819. Plants tall, much branched; joints elongated, 3.5 cm. long, dull green, somewhat tuberculates areoles distant, small; spines if present few, small, white, 1 cm. long or less; glochids yellow; flowe large, yellow. Type locality: In South America. | Distribution: Known only in cultivation. _ vacate. _ We have combined O. lanceolata and 0. elongata, although there 1s a possibility of the , being different. O. lanceolata was first described essentially as follows: Joints flattened, suberect subnaked, with leaves 3 lines long; stems at first erect; joints lanceolate, green, when young with many leaves; spines (spicules?) in fascicles, the shortest of all species (except Cactus coccinellifer) ; leaves longer than im other ae habitat given. In 1812 "The species was received by Haworth from W. Anderson; no ha ” a & ry Atnevinn Haworth calls it the spear-shaped Opuntia. He says it prébably came from South a, 180 THE CACTACEAE. and flowers in July. It had been in cultivation before 1796; it flowered in 1808 with Haw- orth and was described as follows: Flowers shiny yellow; filaments yellow, half as long as petals; style longer than stamens; stigmas 5, thick, obtuse, 2 lines long, sulphur-colored. De Candolle says the flowers are 4 inches in diameter. Pfeiffer states the joints are 5 to 6 inches long by 1 to 1.5 inches broad; that the leaves are red and the spicules yellow. Opuntia elongata laevior Salm-Dyck (Cact. Hort. Dyck. 1849. 242.1850) may or may not belong here. Fic. 220.—Opuntia maxima. _> 200. Opuntia maxima Miller, Gard. Dict. ed. 8. No. 5- 1768. Cactus decumanus Willdenow, Enum. Pl. Suppl. 34. 1813. Opuntia decumana Haworth, Rev. Pl. Succ. 71. 1821. Opuntia gymnocarpa Weber, Dict. Hort. Bois 893. 1898. Opuntia labouretiana Console* in Schumann, Gesamtb. Kakteen 717. 1898. Opuntia ficus-indica decumana Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 512. 1905. Opuntia ficus-indica gymnocarpa Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 512. 1905. Forming large, much branched plants; joints elongated, more or less spatulate, 35 cm. long or more, 10 to 12 cm. broad, rounded at apex, somewhat cuneate at base, pale green, not at all tuberculate; areoles small, distant; spines sometimes wanting or sometimes 1 or 2, short, white; glochids yellow (brown in some specimens referred here) ; flowers conspicuous, 8 cm. broad, orange- red; ovary elongated, 7 to 8 cm. long, bearing numerous large glochids. *Berger (Hort. Mortol. 409. 1912) says this is known as O. labouretiana Console. BRITTON AND ROSE PLATE XXXIV M. E. Eaton @el, 3. Joint of Opuntia lasiacantha. _ Part of joint of Opuntia leucotricha. 1 2. Part of joint of Opuntia maxima. 4. Joint of Opuntia r (All natural size.) OPUNTIA. 181 Type locality: In America. Distribution: Known only in cultivation. Opuntia maxima Miller was described as the largest of all the opuntias and as the name is older than any of those here cited, it is taken up for this species. Haworth was uncertain whether or not his O. decumana is distinct from Miller’s O. maxima, although in the Index Kewensis the two are considered the same; Burkill considered them distinct, but his idea of O. decumana is the O. ficus-indica type. Mr. Berger, on the other hand, states that it is evidently of the O. dillenii group, but this is hardly warranted by the descrip- tion. Berger is convinced that O. elongata is distinct from O. decumana. Opuntia labouretiana macrocarpa (Cat. Darrah Succ. Manchester 55. 1908) is only a garden name. Plate xxxIv, figure 2, represents a flowering joint of a plant presented to the New York Botanical Garden by Frank Weinberg in 1901, which bloomed in May 1916. Fig- ure 220 is from a photograph of the same plant. Opuntia bartramit Rafinesque (Atl. Journ. 1:146. 1832) is based on Bartram’s de- scription (Travels p. 163. 1790), in which he states that the plant is 7 to 8 feet high; joints very large, bright green, glossy; spines none; glochids numerous; flowers large, yellow; fruit pear-shaped, purple. It was found about 6 miles from Lake George, northern Florida, associated with Zamia pumila and Erythrina. We do not know of any Opuntia answering the description, growing in Florida at the present time. Dr. Small visited the type locality in 1918 but failed to find any plant answering Rafinesque’s description. Opuntia hernandezii De Candolle (Mém. Hist. Nat. Paris 17: 69. pl. 16. 1828) is a com- plex. The reference to Hernandez applies to Nopalea cochenillifera. Schumann was not able to identify the plant illustrated by De Candolle, but thought it might be referable to Opuntia ficus-indica, in which we agree. \L Series 21. STREPTACANTHAE. Tall, branched, glabrous, green species with white or faintly yellow, acicular or subulate spines, large yellow or red flowers, and fleshy fruits, natives of Mexico and Central and South America. We recognize twelve species. ‘The fruits, known as tunas, are mostly edible and are sold in large quantities in Mexican markets, a practice which probably dates from prehistoric time. The long- continued selection of plants for their fruit has perpetuated many slightly differing races. Key TO SPECIES. Spines short, 5 mm. to 8 cm. long. Joints scarcely if at all tuberculate. ; ; Joints obovate to elliptic, mostly not more than twice as long as wide. Areoles close together, sunken... ... 0.6.6... se eee terete eee Areoles not close together, not sunken. Joints dull. Spines acicular........-.. 5.0000 e seer reer sett tt seers cence ees a a or more short reflexed hairs or bristles at the lower part reoles. Spines strongly, depressed; areoles with several hairs.............. 203. O. hyptiacantha Spines not strongly depressed; areoles with 1 or 2 hairs. ; Joints obovate... 0.0.02... eee erence eerste teens Joints oblong... 2.6... eee etter Areoles without reflexed hairs or bristles. ; ; Spines clear white, terete or nearly so; fruit spineless, 6 to 8 cm. long, 201. O. spinulifera 202. O. lasiacantha 204. O. streptacantha 205. O. amyclaea 206. O. megacantha Plant with a definite trunk; petals reddish; fruit spiny only at top 207. O. deamii . : t . 207a. O dobbieana Joi hining..... ccc cece eee eee eee eee eee eee e eters sees sees 208. O. eichlamit oints shining...........0.00: cere eters Joints oblong to oblanceolate, some of them much longer thar wide. 209. O. inaequilateralis Joints shining; wool of young areoles white; petals ae Oran, to scarlet oo O. pittieri Joints dull; wool of young areoles brown; petals deep 8 ae or. O. cordobensis Joints strongly tuberculate...0. 0.00... 002000 s sees reset essere ss sss sss ss Sie ay i Pines elongated, 10 to 14 cm. long. .....---- ++ c cst 182 THE CACTACEAE. 201. Opuntia spinulifera Salm-Dyck, Hort. Dyck. 364. 1834. Opuntia candelabriformis Martius in Pfeiffer, Enum. Cact. 159. 1837. Opuntia oligacantha Salm-Dyck, Cact. Hort. Dyck. 1849. 241. 1850. Tall, much branched plants; joints orbicular to oblong, sometimes obovate, 20 to 30 cm. long, glabrous, a little glaucous; leaves small, red, 4 to 6 mm. long; areoles on young joints usually small, sometimes longer than broad, the margin at first bordered with cobwebby hairs, afterwards short white hairs, either spineless or with short white bristle-like spines; areoles on old joints more or less sunken, rather close together; spines on old joints 1 to 3, 1 to 2 cm. long, subulate, bone-colored. Type locality: In Mexico. Distribution: Mexico. We have seen no wild specimens of this species, but Mr. Berger has grown it at La Mortola, Italy, and has distributed specimens now growing in New York and Washington. So-called Opuntia candelabriformis and O. . = . oligacantha are also in cultivation; but the original descriptions indicate that these two species should be merged into O. spinulifera, and plants so determined in European collec- tions support this view. In so far as we have been able to ascertain, no type specimens of any of the three supposed species are extant. Schumann (Gesamtb. Kakteen 740. 1898) de- scribes the flowers of O. candelabriformis as purple, 6 to 7 cm. broad. Opuntia candela- briformts rigidior Salm-Dyck (Cact. Hort. Dyck. 1849. 68. 1850), an unpublished variety, may belong here. Figure 221 represents a joint of a plant presented to the New York Botanical Garden by Mrs. George Such in 1900. . 202. Opuntia lasiacantha Pfeiffer, Enum. Cact. 160. 1837. Opuntia megacantha lasiacantha Berger, Bot. Jahrb. Engler 36: 453. 1905. A tall plant, with a more or less definite trunk; joints obovate to oblong, 20 to 30 cm. long; leaves short, red; areoles small, 2 to 3 cm. apart; spines usually 1 to 3, acicular, white, 2 to 4 cm. long, slightly spreading; glochids numerous, prominent, dirty yellow to brown; flowers large, yellow or deep orange, 6 to 8 cm. broad; ovary bearing long, brown, deciduous bristles, especially from the upper areoles; style pinkish; stigma-lobes pale green. Fic. 221.—Opuntia spinulifera. Xo.4. Type locality: In Mexico. Distribution: Central Mexico. _ Schumann refers O. lasiacantha to O. robusta, but wrongly, as Berger states, and as living plants show. Pfeiffer said it is near O. candelabriformis, here taken up under O. spinulifera. This species is very variable and, while it seems distinct from O. megacantha, it is to be noted that Mr. Berger referred it to that species as a variety. Opuntia chaetocarpa Griffiths (Proc. Biol. Soc. Washington 27: 25. 1914), in its few long white spines, resembles plants collected by Dr. Rose in southern Mexico which we have referred to this species. Illustration: Addisonia 3: pl. go. Plate xxxIVv, figure 3, represents a flowering joint of a plant collected by Dr. Rose near the City of Mexico in 1906. Figure 222 represents a joint of a plant collected by Dr. Mac- Dougal and Dr. Rose at Tehuacin, Mexico, in 1906. OPUNTIA. 183 OPUNTIA ZACUAPANENSIS Berger, Hort. Mortol. 413. 1912. “A fine new species with bright-orange flowers. We received this plant a few years ago from M. L. Puteaux, Versailles, as Opuntia spec. from Zacuapan.* Joints 13 to 20 cm. long and 9.5 cm. broad, obovate, smooth, glossy green, areoles 15 to 25 mm. distant, slightly elevated, small, roundish or obovate. Spicules yellow, short, not numerous. Spines generally two, white, with yellowish points and base, terete, the lower deflexed shorter, the upper one spreading (2—) 3 cm.long. Flowers numerous from the top of the joint, 7.5 cm. long and 6.5 cm. broad, ovary obovate turbinate, 3-5 to'4 cm. long and 22 mm. broad, areoles somewhat elevated, prickly; petals obovate lanceolate, acute and aristate, orange-yellow; with a more reddish-brown hue along the midrib on the back and as well on the shorter obtuse outer petals; stamens yellow, style yellowish, thickened or clavate above the base, stigmata (6-) 7, dirty rose-coloured.”’ We have studied a plant, sent from La Mortola to the New York Botanical Garden in 1913, which has not flowered; it appears to be related’ to O. lasiacantha. Figure 223 represents a joint from the plant received from La Mortola, Italy, in 1913. : Mg | IF — f BAM = oe Ae “a W X NY BOSS ZR p / VAC r — » WA” VX . Zp \ Fic. 224.—Opuntia hyptiacantha, X0O.5- Fic. 223.-—Opuntia zacuapanensis.. X0.4. Fic. 222.—Opuntia lasiacantha. X0.4. => 203. Opuntia hyptiacantha Weber, Dict. Hort. Bois 894. 1898. ra NIgrt i d. 21: 169. 1910. Opuntia nigrita Griffiths, Rep. Mo. Bot. Gar 6 ? Opuntia cretochaeta Griffiths, Proc. Biol. Soc. Washington 29: 11. 1916. i ivati igh; joints oblong to obovate, but in cultivation often only 1 meter high; joints 20 to. ot in Oa eee but when young bright green, spines on young joints single, porrect, ccompanied by 2 OF 3, slightly pungent hairs; spines on old joints and accompanied by 2 or 3, sometimes many, white, *Perhaps Zacualpan, in Vera Cruz, Mexico. 184 THE CACTACEAE. 4 to 6 (in the original description 8 to 10), somewhat spreading or appressed, 1 to 2 cm. long; glochids few, brownish; areoles small, 1.5 cm. apart; leaves small, brownish; flowers red; fruit globular, yellowish, its areoles filled with long, weak glochids; umbilicus broad, only slightly depressed. Type locality: In Mexico. Distribution: Oaxaca, Mexico. This species is very near Opuntia streptacantha, and in many cases it is difficult to separate them. It is also near O. pilifera, but the areoles are not so hairy. Weber, who first described it, gives no definite locality for the species; but Dr. Rose has examined, at La Mortola, Italy, a living plant sent by Weber which seems to be the same as one of the large opuntias from Tehuacdn, Mexico. Opuntia chavena Griffiths (Rep. Mo. Bot. a WN nf 2 ] j Gard. 19: 264. pl. 23, in part. 1908) is a Ne eal SNe near relative of O. hyptiacantha or not dis- Sr IA kK SS, Yl . . ZK f \ 7 \ yy tinct from it. SH RK SSX NMA Illustration: Rep. Mo. Bot. Gard. 21: l/ \ AR pl. 24, as Opuntia nigrita. Ay \\ NZ \ |\ Jo Figure 224 represents a joint of a plant ~ S4#C IF it _ pb Sas obtained for the New York Botanical Garden . 4 , ‘a 1 { v _ r ” y . y * ‘ v4, . Ca rn ‘ - (op eee a " 4 ; «~ , % >» » - rs Wn » te? . +. rp a Ri ve i ry . . é . £ f a % a o OS Ne « } t . ? < y Pa FEN o e' A Pty \ * d a » vas ¥ » ie 2. . 4 sh ath . ~ 4 a Lt SOO See Si os (ieec a ; *. \ ‘ « ‘\ J i > . ; ‘ eae J ite, ‘ 4 os - \4 | Sms Lon ee Vee Ce raat ~~ Ss oe Fic. 227—Opuntia megacantha on Lanai, Hawaiian Islands. Type locality: In Mexico. Distribution: Much cultivated in Mexico; grown also in Jamaica and southern Cali- fornia and escaped from cultivation in Hawaii. This species was originally described by Salm-Dyck essentially as follows: Erect and of the size of O. decumana; joints 17.5 cm. long by 7.5 cm. broad and 2.5 cm. or more thick; areoles close together, filled with gray wool; glochids brownish, becoming blackish; spines 7 to 10, white, unequal, acicular, somewhat radiating, the longest one deflexed, 5 cm. long; flowers not known; leaves small, reddish. Opuntia megacantha trichacantha Salm-Dyck was given as a synonym of this species by Forster (Handb. Cact. 486. 1846), but was never pub- lished. Opuntia tribuloides Griffiths (Monatsschr. Kakteenk. 23: 137. 1913), according to the de- scription, is of this relationship. This is the chief Mission cactus. It is the one from which the best varieties of edible tunas are obtained and is one of the commonest culti- vated opuntias in Mexico, having numerous forms, many of them bearing local names. Illustrations: Ariz. Agr. Exp. Sta. Bull. 67: pl. 8, f. 2; Rep. Mo. Bot. Gard. 19: pl. 24, both as Opuntia castillae. Rep. Mo. Bot. Gard. 22: pl. 4, 5, these two as Opuntia incarnadilla; Amer. Journ. Bot. 4: 572. f. 6. Plate xxxul, figure 4, represents a flowering joint of a plant in the same collection received from Fairmount Park, Philadelphia, in 1905. Figure 226 is from a photograph of a plant in the collection of the New York Botanical Garden; Fic 228.—Opuntia megacantha. Xo0.4. OPUNTIA. 187 figure 227 is from a photograph taken by A. S. Hitchcock on Lanai in 1916; figure 228 represents a joint of a plant obtained by Dr. MacDougal near Mount Wilson, Cali- fornia, in 1906, a nearly spineless form. 207. Opuntia deamii Rose, Contr. U.S. Nat. Herb. 13: 309. 1911. One meter or so high, with a definite cylindric trunk, branching a short distance above the base; branches few, ascending; joints erect or spreading, very large, obovate to oblanceolate, 25 to 30 cm. long, at first bright leaf-green, in age dark green, glabrous; areoles remote, often 4 cm. apart, rather small; spines 2 to 6, usually 4, white or dull yellow, stout, somewhat flattened, spreading or porrect, 3 to 5.5 cm. long; flowers 7 cm. long, reddish; fruit oblong, 6 cm. long, naked, except for a few spines near the top, wine-red both within and without, not edible; seeds small, 3 mm. broad. \ _ Type locality: Fiscal, Guatemala. Ve aatN A Distribution: Fiscal to San José de Golfo and y P ea Sanarata, Guatemala. : a, 7 C Illustration: Contr. U. S. Nat. Herb. 13: .\ V4 \ pl. 65. Figure 229 represents a joint of the type specimen. A tall, white-spined Opuntia, closely resembling the Mexican O. macracantha, was obtained by Dr. \y | k ) Rose in 1918 (No. 22390) along A 4 a roadsides at Ambato, Ecuador, f’ ba a presumably escaped from cultiva- tion; its fruit is edible. 207a. Opuntia dobbieana sp. nov. \ (See Appendix, p. 225.) wy 208. Opuntia eichlamii Rose, Contr. ZI | / \ < U. S. Nat. Herb. 13: 310. f Ly’ IQII. — RK Tree-like, 5 to 6 meters high, the a sA\ main branches nearly erect; joints obo- vate to orbicular, 15 to 20 cm. long, ) more or less glaucous, especially in A Si dried specimens; leaves minute, cadu- an cous; areoles small, 3 to 3.5 cm. apart; “SS spines 4 to 6, very unequal, 2 cm. long 7 p or less, rose-colored at first, soon be- S coming white, spreading, the larger —w ones flattened; glochids brown; flower iS 4 3-5 cm. long; petals carmine; style ss red; stigma-lobes 8 to 11, bright green; fruit 4 cm. long, strongly tu- berculate, not edible. \ Y, ~ Ml Fic. 229.—Opuntia deamii Type locality: Near Guatemala City. Distribution: Suburbs of Guatemala City, Guatemala. Illustration: Contr. U. S. Nat. Herb. 13: pl. 66. Figure 230 represents‘a joint of the type specimen. 209. Opuntia inaequilateralis Berger, Bot. Jahrb. Engler 36: 453. 1905. : : : : 401 i ly ovate to subrhomboid, About 12 dm. high, with spreading branches; joints oblique, narrowly ; 40 to 70 cm. long, 2 to 4 times 2s long as wide, narrowed at base, obtuse at apex, with somewhat 188 THE CACTACEAE. sinuate margins, green, shining; young joints bright green, not at all glaucous, oblanceolate to narrowly oblong, rounded at apex; leaves reddish, subulate, 2 to 3 mm. long; areoles small, circular, filled with white wool when young, and having white, somewhat cobwebby hairs on the outer edge; glochids brown, in a dense cluster; spines 3 to 7, acicular on young joints, but finally 10 to 15, stout, 3 to 4 cm. long, at first yellowish, becoming white, somewhat spreading but not appressed to the joint; flowers large, borne at the apex of the joints; petals yellow, broadly obovate, retuse with crenulate margins; stigma-lobes green; fruit oblong, truncate, reddish, juicy, sweet. Type locality: Described from cultivated specimens grown at La Mortola, Italy. Distribution: Known only from cultivated specimens, their origin unknown. Illustration: Figure 231 shows a joint of a plant sent from La Mortola, Italy, in 1913. 4 Fic. 230.—Opuntia eichlamii. Xo.5. Fic. 231.—Opuntia inaequilateralis. Xo.5. 210. Opuntia pittieri sp. nov. Plant up to 5 meters high, with a rather definite cylindric spi - i0i Raed » ylindric spiny trunk; joints large, 25 to 50 cm. long, 2 to 4 times as long as wide, narrowly oblong, green; leaves subulate, with purple tips: wool in young areoles dark brown to purple; areoles elevated, rather large, 2 to 3 cm. apart; spines 3 to 6, slightly spreading, acicular, white, the longest 2 to 2.5 cm. long; glochids tardily developing, few, often wanting; flowers deep orange, turning to sc ; v, ) ge, arlet; spiny, nearly truncate at apex. g ovary nearly globular, more or less Collected at Venticas del Dagua, Dagua Valley, western cordillera of Colombia, February 1906, by H. Pittier, and since grown in Washington and New York. OPUNTIA. 189 Opuntia pitiiert differs from O. inaequilateralis in having the young joints thinner, somewhat tuberculate, and with longer leaves; the areoles, too, are filled with brown or purple wool, while the glochids develop more slowly or never appear. Figure 232 represents a joint of the type plant. 211. Opuntia cordobensis Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 513. 1905. Much branched, the trunk 1 to 2 meters long, 20 cm. in diameter, very spiny; joints large, 3 dm. long or more, broadly oblong to obovate; areoles prominent, numerous; spines 1 to 6, white, somewhat spreading, a little flattened and twisted; flowers usually on the margins of the joints; petals about 12, yellow; fruit pyriform, yellowish both within and without, 8 cm. long; seeds about 3 mm. long. Fic. 233.—O. cordobensis. Xo.4. Fic. 232.—O. pittieri. Xo.4. Fic. 234.—Fruit of O. cordobensis. X0o.7. Type locality: Near Cordoba, Argentina. Distribution: Northern Argentina. , The only white-spined species observed by Dr. Rose in Irg15 about Cordoba were O. ficus-indica, in cultivation, and what we have taken to be O. cordobensis. The latter is very abundant, growing on the hills about the city, and sometimes planted as hedges. Dr. Spegazzini states that it has the habit of O. labouretiana. Cérdoba, A _ ‘Figure 233 represents a joint of the plant collected by Dr. Rose Sha or . C leon, tina, in 1915; figure 234 represents the fruit as collected by J. A. Shafer at Calilegua, Argentina, in 1917 (No. 197). 190 THE CACTACEAE. 212. Opuntia quimilo Schumann, Gesamtb. Kakteen 746. 1898- Much branched, about 4 meters high; joints large, elliptic or obovate, 5 dm. long by 2.5 dm. broad, 2 to 3 cm. thick, grayish green; spines very long, usually 1, sometimes 2 or 3 from an areole, twisted, 7 to 14.5 cm. long; flowers red, 7 cm. broad; fruit pear-shaped to globular, 5 to 7 cm. long, greenish yellow; seeds 8 mm. broad, 1.5 to 2 mm. thick, with broad, thick, white margins. Type locality: a Banda, Santiago del Estero, Argentina. Distribution: Northern Argentina. This plant is known to the natives as quimilo. Dr. Rose obtained a good photograph of it from Dr. J. A. Dominguez, and seed and a photograph from Dr. Spegazzini. While the volume was going through the press a fine specimen in fruit with the long spines so characteristic of this species was obtained by H. M. Curran at-Quilino, Cérdoba, Argentina. Dr. Shafer’s specimens collected at Rio Piedras, show that the trunk-areoles sometimes bear as many as eight spines. Fic. 235.—Joint of Opuntia quimilo. X0.3. Fic. 236.—Fruit of Opuntia quimilo. Xo0.3. Figure 235 represents a joint obtained by Dr. Shafer at Rio Piedras, Salta, Argentina, January 4, 1917 (No. 34); figure 236 represents the fruit from the same plant; figure 237 is from a photograph of a flowering joint of the plant, contributed by Dr. Spegazzini. The following may belong to this series: OPUNTIA ITHYPETALA Griffiths, Bull. Torr. Club 43: 529. 1916. Tall, erect plant, 2 meters or more high; joi , , ; joints large, obovate, 26 to 45 cm. long, 14 to 19 cm. broad, much contracted below, bright dark green, somewhat tuberculate at the areoles; subulate, 5 to 6 mm. long; areoles large, often 1 cm. in diameter, 4 to 5 cm. apart; spines white at least on second year’s growth, 3 to 5; central spine largest i aa ’ , 1 Spl st, porrect, 3 to 4 cm. long; flowers yellow, fading to rose-purplish; petals erect, 3 cm. in diameter; style white; stigma-lobes 6, light greet Known only from cultivated plants received from the Berlin Botanical Garden. co Pa Joints orbicular to broadly obovate or OPUNTIA. 191 V Series 22. ROBUSTAE. Tall or large plants with blue or bluish green joints, the spines, when present, white or yellowish. T'wo of the species are widely distributed in warm regions through cultivation for their edible fruits; the other is known in cultivation only in central Mexico. All are presumably Mexican in origin. KEY TO SPECIES. elliptic. Fruit deep red, 7 togem.indiameter. 213. O. robusta Fruit greenish white, 4 to 5 cm: in diameter................-20085 214. O. guerrana Joints oblong, narrowed at both ends.. 215. O. fusicaulis 213. Opuntia robusta Wendland in Pfeiffer, Enum. Cact. 165. 1837. Opuntia flavicans Lemaire, Cact. Gen. Nov- Sp. 61. 1839. Opuntia larreyi Weber in Coulter, Contr. U. S. Nat. Herb. 3: 423. 1896. Opuntia gorda Griffiths, Monatsschr. Kakteenk. 23: 134. 1913. Often erect, sometimes 5 meters high, usually much branched; joints orbicular to oblong, 20 to 25 cm. long by 10 to 12.5 cm. broad, very thick, bluish green, glaucous; leaves 4 mm. long, reddish, acute; spines 8 to 12, stout, very diverse, brown or yellowish at base, white above, up to 5 cm. long, but often wanting on greenhouse specimens; flowers 5 cm. broad, yellow; stigma-lobes green; fruit globular to ellipsoid, at first more or less tuberculate, deep red, 7 to 9 cm. long. Type locality: In Mexico. Distribution: Central Mexico; cultivated in Argentina. This is one of the few species of Opuntia of which we have not been able to verify the original publication. It was redescribed by Fic. 237.—Opuntia quimilo. Pfeiffer in 1837. Opuntia camuessa Weber (Dict. Hort. Bois 895. 1898) was given as a synonym of O. robusta, but was never described; and the same is true of O. piccolominiana Parlatore (Schumann, Gesamtb. Kakteen 741. 1898). The variety Opuntia robusta viridior Salm-Dyck (Forster, Handb. Cact. 487. 1846) was never described. Opuntia albicans Salm-Dyck (Hort. Dyck. 361. 1834) we do not know, but A. Berger, who has grown a plant under that name at La Mortola, says it is closely related to 0. robusta, while in the New York Botanical Garden are specimens labeled O. albicans which are difficult to distinguish from O. ficus-indica. Here belong the following: O. prate Sabine (Pfeiffer, Enum. Cact. 155. 1837), given as a synonym of O. albicans; O. albicans laevior Salm-Dyck (Cact. Hort. Dyck. 1849. 67. 1850), name only; and O. pruinosa Salm- Dyck (Cact. Hort. Dyck. 1849. 67. 1859) given as a synonym of O. albicans lacvior. Opuntia larreyi, a manuscript name of Weber, which was published by Coulter in 1896, is based on the plant known to the Mexicans as camuessa. Weber gave it the name of O. camuessa, as shown above, but did not publish it; it is usually considered to be only a race of O. robusta, but Dr. Griffiths considers it a distinct species, even referring it to a different series, the Ficus-indicae (N. Mex. Agr. Exp. Sta. Bull. 64: 56. 1907). 192 THE CACTACEAE. Berger remarks that this species is very variable, but that it can not well be divided even into varieties. Opuntia megalarthra Rose (Smiths. Misc. Coll. 50: 529. 1908), in its very spiny joints, yellow spines, and small fruits, seems very different from the common cultivated O. robusta; yet when grown in the greenhouse for several years it takes on much the appearance of O. robusta. If this view is correct, O. megalarthra represents the wild form of the species. Opuntia cochinera Griffiths (Rep. Mo. Bot. Gard. 19: 263. pl. 26. 1908) from Zacatecas, Mexico, is, perhaps, a hybrid between Opuntia robusta and one of the Streptacanthae. Illustrations: N. Mex. Agr. Exp. Sta. Bull. 60: pl. 5, f. 1; Monatsschr. Kakteenk.23: 135; Journ. Inter. Gard. Club 3: 14, the last two as Opuntia gorda; U.S. Dept. Agr. Bur. Pl. Ind. Bull. 74: pl. 5, as Tapuna pear. ? N. Mex. Agr. Exp. Sta. Bull. 64: pl. 1. Plate xxxIVv, figure 4, represents a joint of the plant collected by Dr. Rose in Hidalgo, Mexico, in 1905, and described by him as Opuntia megalarthra. Figure 238 is from a photo- graph taken in Zacatecas, Mexico, by Professor F. E. Lloyd in 1908. Fic. 238.—Opuntia robusta. 214. Opuntia guerrana Griffiths, Rep. Mo. Bot. Gard. 19: 266. 1908. Plant 9 to 12 dm. high, with an open, branching top; joints oblong to orbicular, 15 to 25 cm. long, thick, glaucous; areoles 5 mm. in diameter, filled with tawny wool; spines white to yellow, 1 to 6, flattened, twisted; petals yellow; filaments greenish white; stigma-lobes green; fruit globose greenish white, 4 to 5 cm. in diameter. Type locality: Near Dublan, Hidalgo, Mexico. Distribution: Known only from type locality. Except in size and color of fruit this species is very much like the common Opuntia robusta of this part of Mexico. 215. Opuntia fusicaulis Griffiths, Rep. Mo. Bot. Gard. 19: 271. 1908. Plant 5 meters high or less, the branches erect or spreading; joints oblong, elongated, 4 dm. long or less, much longer than wide, glaucous, bluish green, spineless, narrowed at both ends; glo- chids often wanting; areoles small, filled with tawny wool; fruit greenish white. Type locality: Described from cultivated plants. Distribution: Known only from cultivated specimens. Illustration: Rep. Mo. Bot. Gard. 19: pl. 23, in part. J a / OPUNTIA. 193 The following may be referable to this series: OPUNTIA CRYSTALENIA Griffiths, Bull. Torr. Club 43: 528. 1916. Erect, 2 to 2.5 meters high; joints broadly obovate, 25 cm. long, 18 cm. wide, glaucous, bluish green, becoming yellowish in age; leaves 4 mm. long, subulate; spines white, porrect, only on the upper parts of the joints, 1 to 4, usually only 2, the longest 1 to 1.5 cm. long; glochids yellow; flowers yellow; stigma-lobes 10, dark green; fruit subglobose, 4 to 4.5 cm. in diameter. Type locality: Cardenas, Mexico. Distribution: Highlands of Mexico, where it is also cultivated. Series 23. POLYACANTHAE. ‘This series is confined chiefly to plains of the western United States. ‘I'he species are all low, creeping plants, very spiny, with dry fruits. On account of the dry fruit this series forms a natural group, although some species in the series Basilares also have dry fruits. One species of series Polyacanthae has fragile branches, in this respect resembling the Curassavicae. ‘The species hybridize with those of the Tortis pinae. KEY TO SPECIES. Joints readily detached, turgid, some of them subterete or subglobose...................... 216. O. fragilis Joints not readily detached, usually flat and thin, or in O. arenaria sometimes turgid and nearly terete. Joints turgid, usually small... 2.0 eee eee e eee t eens 217. O. arenaria Joints thinner than the last, mostly flat, larger. Spines, or some of them, very long, flexible and bristle-like. a Flowers 4 to 5 cm. long... 0.0... cee cee eee tect e ceca ceweneeceieces 218. O. trichophora Flowers 5 to 6 cm. long. . 2... 0... eee eee eens 219. O. erinacea Spines stiff, acicular or subulate; areoles distant. Spines subulate. Fruit naked... eee nee t tee e eee 220. O. juniperina Fruit spiny. _ Flowers yellow... 0.0.0... eee eee n tenets 221. O. hystricina Flowers red... ene nent nent eee e eee ene 222. O. rhodantha Spines acicular, slender; areoles close together. Ovary and fruit without spines... 0.0.2.2... 00 e ec ee cette eee 223. O. sphaerocarpa Ovary and fruit with spines............. 6.6. e peer ee ees 224. O. polyacantha 216. Opuntia fragilis (Nuttall) Haworth, Suppl. Pl. Succ. 82. 1819. Cactus fragilis Nuttall, Gen. Pl. 1: 296. 1818. Opuntia brachyarthra Engelmann and Bigelow, Proc. Amer. Acad. 3: 302. 1856. _ Opuntia fragilis brachyarthra Coulter, Contr. U. S. Nat. Herb. 3: 440. 1896. Opuntia fragilis caespitosa and tuberiformis Hortus, Stand. Cycl. Hort. Bailey 4: 2363. 1916. (?) Opuntia columbiana Griffiths, Bull. Torr. Club 43: 523. 1916. Usually low and spreading, small and inconspicuous, but sometimes forming mounds 2 dm high in the center and 4 dm. in diameter, with hundreds of joints; joints fragile (the terminal ones especially breaking off at the slightest touch), often nearly globular but sometimes decidedly flat- tened, usually dark green, 1 to 4 cm. long; areoles closely set, small, filled with white wool ; spines 5 to 7, brown or only with brown tips and lighter below, 1 to 3 cm. long; glochids yellowish; flowers pale yellow, about 5 cm. broad; fruit dry, spiny, 1.5 to 2 cm. long, with a truncate or slightly depressed umbilicus; seeds large, 5 to 7 mm. broad. Type locality: ‘‘From the Mandans to the mountains, in sterile but moist situations.” Distribution: Wisconsin to central Kansas and northwestern Texas, westward to Ari- zona, Oregon, Washington, and British Columbia. i Dr. Engelmann says “‘it is rarely found in flower and still more rarely seen in fruit. The only fruit we have seen was collected by Dr. Rose near Liberal, Kansas, in IgI2. Opuntia brachyarthra, sometimes regarded as a variety of O. fragilis, we regard as not specifically separable from that species. An examination of the type material now pre- served in the Missouri Botanical Garden does not warrant a separation of any kind. This species is of wide distribution and is especially common on the plains. It usually grows low, often being hidden by the grass. In the grazing country it 1s a most trouble- some weed, for the joints easily break off and become attached by their spines to passing objects, thus greatly annoying and pestering all animals on the range, even frightening 194 THE CACTACEAE. horses. The wide distribution of the species is doubtless largely due to the fact that the joints are so easily scattered. A hybrid with O. tortispina has been found in Kansas (Rose, No. 17132). The plant is of especial interest as the most northern in distribution of the opuntias. It is stated that Opuntia cervicornis Spath (Cat. 156. 1906-7) is “‘probably a hybrid of which O. fragilis is a parent” (Kew Bull. Misc. Inf. 1907: App. 74. 1907). O. sabini (Pfeiffer, Enum. Cact. 147. 1837) was given as a synonym of O. fragilis. Illustrations: Cact. Journ. 1: 100; Dict. Gard. Nicholson 2: f. 752; Férster, Handb. Cact. ed. 2. f. 132; Gartenflora 30: 413; Pac. R. Rep. 4: pl. 12, f. 9; Rimpler, Sukkulenten f. 126; W. Watson, Cact. Cult. f. 78; Wiener Illustr. Gartenz. 10:f. 113, all as Opuntia brachyarthra. Ilustr. Fl. 2: f. 2532; ed. 2. 2:f. 2991; Pac. R. Rep. 4: pl. 24, f. 5. Plate xxxv, figure 1, shows old and young joints of the plant collected by C. Birdseye at Florence, Montana, in rg10. Figure 239 is from a photograph of the plant taken by E. R. Warren at San Acacio, Colorado, in 1912. Fic. 239.—Opuntia fragilis. 217. Opuntia arenaria Engelmann, Proc. Amer. Acad. 3: 301. 1856. Roots in clusters of 10 to 15, spindle-form, somewhat fleshy; stem prostrate, 2 to 3 dm. long, much branched; joints during growing season quite turgid, afterwards much thinner, to 8 can, long, half as broad as long; areoles large, numerous, filled with brown wool, glochids, and spines ; spines 5 to 8 from an areole, 2 or 3 much longer than the others, sometimes 4 cm. long; flowers red, 7 cm. broad; fruit dry, spiny, 3 cm. long; seeds large, 7 cm. broad. | Type locality: Sandy bottoms of the Rio Grande near El Paso. Distribution : Texas and southern New Mexico. This species is very rare and has been reported only a few times. Dr. Rose, who has repeatedly collected at El Paso, was never able to find it until October 1913, and then but a single plant about 8 miles above El Paso on the New Mexican side of the Rio Grande. It grows in nearly pure sand not far above the level of the river. BRITTON AND ROSE PLATE XXXV M. E. Eaton del. 1. Plant of Opuntia fragilis. 2. Flowering branch of Opuntia rhodantha. 3. Flowering joint of Opuntia polyacantha. (All natural size. ) OPUNTIA. 195 Illustration: Cact. Mex. Bound. pl. 75, f. 15. Figure 240 is from a drawing of the plant collected by Dr. Rose near El Paso, ‘Texas, in 1913. 218. Opuntia trichophora (Engelmann) Britton and Rose, Smiths. Misc. Coll. 50: 535. 1908. Hr Opuntia missouriensis trichophora Engelmann, Proc. Amer. Acad. 3: 300. 1856. Opuntia polyacantha trichophora Coulter, Contr. U. S. Nat. Herb. 3: 437. 1896. A low, spreading plant, often forming small clumps 6 to 10 dm. in diameter; joints orbicular to obovate, 6 to 10 cm. in diameter; areoles closely set; spines numerous, very unequal, the longer one 4 cm. long or so, acicular, pale, often white, but on old joints developing into long, weak hair- like bristles; flowers yellow, the sepals tinged with red; ovary with numerous areoles, these bear- ing weak, pale bristles; fruit unknown. Type locality: Mountains near Albuquerque, New Mexico. Distribution: New Mexico, Texas, and Oklahoma. This plant, while closely related to Opuntia polya- WAT cantha, seems worthy of specific rank, its long weak spines GRRE ; being apparently characteristic. Its northern extension —/ REA SINE SS into Oklahoma has recently been determined AN) A S ws from plants collected by G. W. Stevens. SSS Illustrations: Pac. R. Rep. 4: pl. 15, f. 1 to 4; pl. 23, f. 19, all as Opuntia missouriensis trichophora. Figure 241 is copied from the first illus- \\ tration above cited. N \ = ,, RaNS / Y ETI RAN PARRY SA) NW we’ NY NN Co Fic. 240.—Opuntia arenaria. X0.75. Fic. 241.—Opuntia trichophora. 0.75. >) 219. Opuntia erinacea Engelmann, Proc. Amer. Acad. 3: 301. 1856. Opuntia ursina Weber, Dict. Hort. Bois 896. 1898. the branches ascending or erect; joints ovate to oblong, flattened to 12 cm. long; areoles somewhat tuberculate, large, numerous, ometimes brownish or with brown stiff, often developing on the old either red or Growing in small, low clumps, or thick, sometimes nearly terete, 8 5 closely set, 4 to 10 mm. apart; spines numerous, usually white or s tips, slender, often 5 cm., sometimes 12 cm. long or even more, ; joints as long hairs or bristles; glochids numerous, flowers rather large, 6 to 7 cm. long, yellow; ovary and fruit very spiny; seeds large, rather regular. Type locality: On Mojave Creek, California. Distribution: Northwestern Arizona, southern Utah, southern Nevada, and eastern California. 196 THE CACTACEAE. This species has long been passing under the name of Opuntia rutila Nuttall (Torrey and Gray, Fl. N. Amer. 1:555. 1840). Dr. Engelmann referred it there in the Report of Simp- son's Expedition (page 442), and again in the Botany of California, with the remark that “this plant seems to be Nuttall’s long lost O. rutila.”” And while it is true that the identi- fication of Nuttall’s plant is still doubtful, it seems improbable that this reference is correct, Fic. 242.—Opuntia erinacea. lor the description does not agree with that of the above, and the original station of O. rutila in Wyoming is far removed from the other; keen collectors like A. Nelson and V Bailey who have searched for the plant for us, have failed to find it in Wyoming We sus ect that O rutila will prove to be O. polyacantha. . susp . Opuntia ursina, which comes from the Mojave Desert, seems to be only a slender form with long weak spines. This is known in the trade as the California grizzly bear cac- tus. Alverson has described it as follows: ‘‘ This curious plant is covered with tawny white OPUNTIA. 197 hairs or flexuous spines, some of which are from 3 to 6 inches long, and I have some extra fine specimens with the spines or hairs 9 and 12 inches long.”’ Illustrations: Alverson, Cact. Cat. 9 as Opuntia ursina; Pac. R. Rep. 4: pl. 13, f. 8 to 11; pl. 24, f. 4. Figure 242 is from a photograph of the plant taken by F. B. Headley at a point about 29 miles east of Fallon, Nevada, in 1910. 220. Opuntia juniperina sp. nov. Somewhat of the habit of Opuntia polyacantha, but not so procumbent, stouter, and with fewer and stouter spines; joints obovate, 10 to 12 cm. long, broad, rounded at top; areoles small, all below the middle of the joint naked, the upper ones each bearing one stout spine and 1 to several very short accessory ones; the longer spine very stout, 3 to 4 cm. long, brown; flowers not known; fruit dry, oblong, 3 cm. long, spineless, with a shallow, flat umbilicus; seeds large, irregular, 6 to 8 mm. broad, Fic. 243.—Joint of Opuntia juni- Fic. 244.—Seed Fic. 245.—Opuntia hystricina. perina. Xo.5. of same. Xo.5. X0.5. On dry hills among junipers in vicinity of Cedar Hill, San Juan County, New Mexico, altitude about 1,900 meters, August 17, 1911, Paul C. Standley (No. 8051). This species is nearest Opuntia rhodantha, but has stouter joints and much larger seeds. Figure 243 represents a joint of the type specimen; figure 244 represents a seed. 221. Opuntia hystricina Engelmann and Bigelow, Proc. Amer. Acad. 3: 299. 1856. i joi i ; les numerous, 10 to 15 mm. More or less diffuse ; joints obovate to orbicular, 8 to 20cm. long; areo , apart, rather large; spines numerous, pale brown to white, the longer ones 5 to 10 cm. rong, stout, flattish, often reflexed; glochids yellow; flowers 6 cm. long; petals broad, yellow; ovary near y g ” ular; fruit oblong to obovoid, 2.5 to 3 cm. long, spiny above, dry, with a compressed umbilicus, see 7 mm. broad. Type locality: Colorado Chiquito and on San Francisco Mountains. Distribution: New Mexico to Atizona and Nevada. Although this species has a wide range, it is not very well understood; it approaches O. rhodantha in some of its forms. We have referred here a very remarkable form collecte by E. W. Nelson at Lee’s Ferry, Arizona, in 1909. This plant has thick, obovate joints 17 198 THE CACTACEAE. to 22 cm. long, strongly tuberculate, with some of the spines very strong, flattened, and re- flexed; the fruit is very spiny; the seeds are 8 mm. broad, angled, with margins thin and acute. ‘This may be the plant listed in Weinberg’s catalogue, also from the Grand Canyon, under the name of Opuntia hochderffert. Opuntia xerocarpa Griffiths (Proc. Biol. Soc. Washington 29: 15. 1916), from Kingman, Arizona, is of this relationship, described as ‘‘readily distinguished from other species of its dry-fruited allies by its spines, shape of joints and color of plant body.” Illustrations: Pac. R. Rep. 4: pl. 15, f. 5 to 7; pl. 23, f. 15. Figure 245 is copied from the first illustration above cited. 7 222. Opuntia rhodantha Schumann, La Semaine Hort. 1897. Opuntia xanthostemma Schumann, Gesamtb. Kakteen 735. 1898. Opuntia utahensis J. A. Purpus, Monatsschr. Kakteenk. 19: 133. 1909. Joints obovate to oblong, 5 to 12 cm. long; areoles distant, 10 mm. apart or more; spines rather stout, 3 or 4, 2 to 3 cm. long, brownish, with 2 or 3 short accessory ones; lower areoles usually naked; glochids brown; flowers, including ovaries, 5 to 6 cm. long, 8 cm. broad; petals red or pink to salmon- colored, obovate, apiculate; stamens red or yellow; fruit spiny; seeds small, 5 mm. in diameter. Type locality: Colorado, at 2,000 to 2,300 meters altitude. Distribution: Western Nebraska, Colorado, and Utah. After a careful examination of living plants of both O. rhodantha and O. xanthostemma, we feel convinced that the latter is only a form of the other. The color of the stamens in the opuntias does not furnish a constant character. It is hardy in cultivation at New York and highly ornamental when in bloom. Haage and Schmidt, in their 1915 cata- logue, list several varieties of this species: brevispina, flavispina, pisciformis, and schu- manniana; and under Opuntia xanthostemma in the same place they list the following varieties: elegans, fulgens, gracilis, orbicularis, and rosea. Illustrations: Meehan’s Monthly 7: 133; Gartenwelt 1: 83, this last as Opuntia xantho- stemma; Monatsschr. Kakteenk. 19: 135, this last as Opuntia utahensis. | Plate xxxv, figure 2, represents a flower- ing plant received by. the New York Botanical Garden from Haage and Schmidt, of Erfurt, Germany, in 1 913. Fic. 246.—Opuntia sphaerocarpa. Xo0.66. 7, 223. Opuntia sphaerocarpa Engelmann and Bigelow, Proc. Amer. Acad. 3: 300. 1856. _ Small, spreading plants; joints orbicular, 6 to 7 cm. broad, thickish, strongly tuberculate, wrinkled in drying, light green or becoming more or less purple; areoles 8 to 10 mm. apart, mostly spineless or the upper and marginal ones bearing short acicular spines, the longest ones about 2 cm. long; glochids yellow; flowers not known; fruit naked, 18 mm. in diameter, with a truncate umbilicus; seeds 5 mm. broad, very irregular. Type locality: Mountains near Albuquerque, New Mexico. Distribution: Known only from type locality. We have not, with certainty, identified any recently collected plants with this species, although some New Mexican specimens appear to be referable to it. Illustrations: Pac. R. Rep. 4: pl. 13, f. 6, 7; pl. 24, f. 3. Figure 246 is copied from the first illustration above cited. OPUNTIA. 199 224. Opuntia polyacantha Haworth, Suppl. Pl. Succ. 82. 1819. Cactus ferox Nuttall, Gen. Pl. 1: 296. 1818. Not Willdenow. 1813. Opuntia media Haworth, Suppl. Pl. Suce. 82. 1819. Opuntia missouriensis De Candolle, Prodr. 3: 472. 1828. Opuntia splendens Pfeiffer, Enum. Cact. 159. 1837. Opuntia missouriensis albispina Engelmann and Bigelow, Proc. Amer. Acad. 3: 300. 1856. Opuntia missouriensis microsperma Engelmann and Bigelow, Proc. Amer. Acad. 3: 300. 1856. Not O. rafinesquei microsperma Engelmann, Proc. Amer. Acad. 3: 295. 1856. Opuntia missouriensis platycarpa Engelmann, Proc. Amer. Acad. 3: 300. 1856. Opuntia missouriensis rufispina Engelmann and Bigelow, Proc. Amer. Acad. 3: 300. 1856. Opuntia missouriensis subinermis Engelmann, Proc. Amer. Acad. 3: 300. 1856. Opuntia polyacantha albispina Coulter, Contr. U. S. Nat. Herb. 3: 437. 1806. Opuntia polyacantha borealis Coulter, Contr. U. S. Nat. Herb. 3: 436. 18096. Opuntia polyacantha platycarpa Coulter, Contr. U. S. Nat. Herb. 3: 436. 1806. Opuntia polyacantha watsonii Coulter, Contr. U. S. Nat. Herb. 3: 437. 1896. Opuntia schweriniana Schumann, Monatsschr. Kakteenk. 9: 148. 1899. Fic. 247.—Opuntia polyacantha. Low, spreading plants, with fibrous roots, usually forming small clumps; joints not very thick, orbicular, usually less than 1o cm. in diameter, generally light green; areoles small, close y set, usually less than 1 cm. apart, all spiny; spines numerous, often 9, those from the sides mostly short, appressed, and white, but often 1 or 2 of these elongated and like those from the upper and marginal areoles, dark brown, with lighter tips and about 3 cm. long; glochids yellow; flowers small, 4 to scm. long, including the ovary; sepals tinged with red; petals lemon-yellow; stigma-lobes green; truit dry, oblong, 2 cm. long, bearing small clusters of white, acicular spines at the areoles; seeds white, 6 mm. long, acute on the margin. Type locality: Arid situations on the plains of the Missour1. _ Distribution: North Dakota to Nebraska, Texas, and Arizona to U tah, Washington, and Alberta. _ . < Acad. 2: 1863) can Opuntia sphaerocarpa utahensis Engelmann (Trans. St. Louis Aca ; 2: 199. u 63 ‘ not be referred to O. sphaerocarpa, where Dr. Engelmann only provisionally placed it w len he first described it. On account of its yellow flowers we have referred it here. Opuntia 200 THE CACTACEAE. polyacantha microsperma and O. polyacantha rufispina, mentioned in Bailey’s Standard Cyclopedia of Horticulture (3: 2363. 1916), belong here. Opuntia polyacantha was one of the first of our western opuntias to be collected and described. It was first collected by Thomas Nuttall on his memorable trip to the Upper Missouri. He described it in 1818 as Cactus ferox, a name which had been previously used by Willdenow, which led A. H. Haworth in 1819 to rename Nuttall’s plant, calling it Opun- tia polyacantha. At the same place Haworth published a second name, Opuntia media, undoubtedly based on a less spiny form of O. polyacantha. In 1828 Nuttall’s plant was again renamed, this time by A. De Candolle, who called it Opuntia missouriensis, under which name it was known for many years. In 1896 Dr. John M. Coulter very properly restored Haworth’s name O. polyacantha. This species has a wide distribution laterally and altitudinally. It is properly a plains’ species, but is found in mountain valleys and on dry hills, usually in the open, but sometimes in sparse pine woods. In a species of such wide distribution and growing under such diverse circumstances, a wide range of forms is to be expected and a number of varieties have been proposed for the various races, some of which may perhaps have red flowers. The plant is hardy at New York, flowering freely in June. Illustrations: Curtis’s Bot. Mag. 115: pl. 7046; Ilustr. Fl. 2: f. 2531; ed. 2. 2: f. 2990; N. Mex. Agr. Exp. Sta. Bull. 78: pl. [3]; Cact. Journ. 1: 167; Gard. Chron. 50: 340, the last two as Opuntia missouriensis; Pac. R. Rep. 4: pl. 14, f. 8 to 10; pl. 23, f. 18, the last two as Opuntia missouriensis albispina; Pac. R. Rep. 4: pl. 14, f. 5 to 7; pl. 24, f. 1, 2, the last two as Opuntia missouriensis microsperma; Pac. R. Rep. 4: pl. 14, f. 4; pl. 23, f. 17, these last two as Opuntia missouriensis platycarpa; Pac. R. Rep. 4: pl. 14, f. 1 to 3; pl. 23, f. 16, these last two as Opuntia missouriensis rufispina; Monatsschr. Kakteenk. 9: 148, this last as Opuntia schweriniana. Plate xxxV, figure 3, represents a flowering joint of the plant collected by Dr. Rose in western Kansas in 1912. Figure 247 represents joints of the plant from Colorado, photo- graphed by T. W. Smillie. Series 24. STENOPETALAE. This is an anomalous group in Opuntia, since the flowers are diceci- ous and the petals are linear and more or less erect. It contains three species which are very different in habit and color of spines, but which were all united into a single species by Profes- sor Schumann. Dr. Engelmann was so much impressed by the peculiar struc- ture of the flowers of this group that he proposed for it a new subgenus, Steno- puntia. KEY TO SPECIES. Spines dark; plants low, prostrate.............. 225. O. stenopetala Spines white; plants erect. Joints narrow; spines acicular........... 226. O. glaucescens Joints broader; spines stouter............ 227. O. grandis Fic. 248.—Opuntia stenopetala. 225. Opuntia stenopetala Engelmann, Proc. Amer. Acad. 3: 289. 1856. Low bushy plant, often forming thickets, the main br i shy plant, S, anches procumbent and resting on the edges of the joints; joints obovate to orbicular, 1 to 2 dm. long, grayish green, but often more or less ae OPUNTIA. 201 purplish, very spiny; areoles often remote, 1 to 3 cm. apart, the lower ones often without spines, bearing white wool when young; leaves only on young joints, spreading, dark red, about 2 mm. long; spines usually reddish brown to black, but sometimes becoming pale, usually 2 to 4, the longest ones 5 cm. long, the larger ones somewhat flattened; glochids very abundant on young joints, brown; flowers dicecious, small, including the ovary only 3 cm. long; petals orange-red, very narrow, 10 to 12 mm. long, with long acuminate tips; filaments short; style very thick in the middle, the male flowers with an abortive, pointed style, but female flowers with 8 or 9 yellow stigma-lobes on style; ovary leafy, the upper leaves similar to the sepals; fruit globular, 3 cm. in diameter, acid, naked or spiny; seeds small, smooth, 3 mm. in diameter, with broad, rounded margins. Type locality: On battlefield of Buena Vista, south of Saltillo, Mexico. Distribution: In States of Coahuila to Querétaro and Hidalgo, central Mexico. Referred by Schumann to O. glaucescens, but surely a distinct species, as indicated by Berger (Monatsschr. Kakteenk. 14: 171. 1904). Although in its habit this Opuntia is much like many others, its flowers are unique, the petals being very narrow and erect; it isa very beautiful plant, and at flowering time is covered with numerous, small, beautiful flowers. Dr. Griffiths states that it is one of the most valuable ornamental opuntias, and that it is hardy in southern California. Illustrations: Cact. Mex. Bound. pl. 66; Monatsschr. Kakteenk. 14: 172. f. 1. Figure 248 is from a photograph of a fruiting joint of a specimen collected by Dr. Edward Palmer near Saltillo, Mexico, in 1905; figure 249 is copied from the illustration first above cited. 226. Opuntia glaucescens Salm-Dyck, Hort. Dyck. 362. 1834. Probably erect; joints erect, oblong-obo- vate, 12 to 15 cm. long, 5 cm. broad, some- times narrowed at both ends, pale green, glaucous, usually purplish around the are- oles; leaves small, reddish when young; are- oles filled with gray wool; spines 1 to 4, elongated, acicular, white, 2.5 cm. long; glo- chids brownish to rose-colored. Type locality: In Mexico. Distribution: Mexico, but range un- Fic. 249.—Opuntia stenopetala. known. The flowers were not known when the species was first described and we do not know that they have since been observed. It has long been in cultivation, but specimens grown under glass at New York have not flowered. 227. Opuntia grandis Pfeiffer, Enum. Cact. 155. 1837. More or less erect, 6 dm. high or more; joints oblong, 12 to 18 cm. long, erect, when young reddish, glaucous; leaves rose-colored; spines few, white; flowers small, a little open, 2 cm. broad; petals few, narrowly lanceolate, 12 mm. long; filaments reddish; style shorter than the stamens, rose-colored; stigma-lobes 2 or 3, acute. Type locality: In Mexico. Distribution: Mexico, but range unknown. _ ay Referred by Schumann to O. glaucescens, but doubtless distinct, as indicated by Berger. Illustration: Monatsschr. Kakteenk. 14: 172. f. 2. Series 25. PALMADORAE. An erect plant with narrow flat joints, small, brick-red flowers, and apparently erect stamens; the epidermis densely papillose-tuberculate when dry. The flowers suggest those of the , pinos’s: simae, but otherwise the plant is quite different. The series consists of a single species, from the catinga region of eastern Brazil. 202 THE CACTACEAE. 228. Opuntia palmadora sp. nov. Plant often 3 meters high, sometimes even 5, but often low; trunk sometimes 9 cm. in diameter, sometimes with brown, smooth bark, but usually very spiny; branches numerous, usually erect, at times forming a compact, almost globular top, at other times quite open; joints unusually thin and narrow, 1 to 1.5 dm. long, generally erect, very spiny; leaves subulate, minute, 3 to 4 mm. long, green with reddish tips, found only on very young joints; areoles filled with white wool; spines usually 1 to 4, sometimes 6, from an areole, all yellow at first, in age white, the largest one porrect, 3 cm. long; petals erect or only slightly spreading, brick-red in color; stamens short, erect; filaments orange-colored; style cream-col- ored; stigma-lobes white; ovary broadly turbinate, 2 cm. long, tubercu- late; fruit small. Collected by Rose and Russell at Barrinha, Bahia, Brazil, June 7, 8, 1915 (No. 19787). This plant is common in the semiarid parts of Bahia, where it is known as palmadora or palmatoria. Johnston and Tryon describe it briefly without giving it a name in their Report of the Prickly-Pear Travelling Commission, 104. 1914. Figure 250 represents joints of the type plant; figure 251 is from a photograph of the wild plant from which the above was taken. Series 26. SPINOSISSIMAE. Erect species, mostly tall, with terete, continuous, unjointed, usually densely spiny trunks, the ultimate branches spreading or divaricate, flat, Pa usually elongated, spiny or sometimes unarmed; flowers small, yellow, ™ Fro. 250.—O. palmadora. orange or red, or changing from yellow to red; fruit fleshy. We recognize seven species, all natives of the West Indies. The series represents the genus Consolea of Lemaire. | ar Fic. 251.—Opuntia palmadora. A thicket in Bahia, Brazil. Fic. 252.—Opuntia nashii. KEY TO SPECIES. Areoles of the joints distant, 2 to 4 cm. apart. Spines few, 3 cm. long or less, or none. Areoles elevated, bearing 2 to 5 grayish spines 3 to 6 cm. long _Areoles scarcely elevated, spineless or with 1 to 4 weak yellow Spines, when present, many, the older up to 12 cm. long Areoles of the joints closer together, 1 to 1.5 cm. apart. Spines of the trunk-areoles, or most of them, deflexed. Young spines straw-colored or whitish; plant up to 5 m. tall _ Young spines purple; plant 6 dm. high or less. ...... Spines of the wrunk-areoles, when present, spreading, 233° oints | istinct y reticulate-areolate, light reen; ovar i Joints indistinctly reticulate-areolate, mostly dark green or reddich: Say te bee eee cece 229. O. nashii spines 1 to 2 cm. long... 230. O. bahamana Pee eee eee eee eee 231. O. macracantha . Spinosissima . millspaughit O O Lene 234. O. moniliformis erculate 235. O. rubescens OPUNTIA. 203 229. Opuntia nashii Britton, Bull. N. Y. Bot. Gard. 32446. 1905. Tree-like, or sometimes bushy, dull green; main axis round, 1 to 4 meters high, 5 to 12 cm. in diameter, spiny; branches flat or becoming round below, the principal ones continuous, 1 meter long or more, 6 cm. wide or less, crenate, blunt; lateral branches opposite or alternate, oblong to linear-oblong, often 3 dm. long, and 8 cm. wide, only about 6 mm. thick, blunt, crenate; areoles 1 to 3 cm. apart, slightly elevated; spines mostly 5 at each areole (2 to 5), divergent, slender, straight, light gray, pungent, the longer 3 to 6 cm. long; glochids very small, brownish; ovary 3 cm. long, 1.5 cm. thick, somewhat clavate, tubercled, the tuber- cles bearing areoles and spines similar to those of the joints, but the spines somewhat shorter; flowers 1.5 cm. broad when ex- panded, red; petals broadly oval to obovate, blunt, about 8 mm. long, much longer than the stamens. Type locality: Inagua, Bahamas. Distribution: Andros, Crooked Island, Fortune Island, Atwood Cay, Caicos Islands, Turks Islands, Ship Channel Cay, and Inagua, Bahamas. Figure 252 is from a photograph of a plant at Matthew Town, Inagua, Bahamas, taken by George V. Nash, in 1904; figure 253 is from a photograph of a plant from the same place in the collection of the New York Botanical Garden. 230. Opuntia bahamana sp. nov. Branched from near the base, bushy, about 1.5 m. high; joints oblong to lanceolate, flat, and thin, 1 to 5 dm. long, 4 to 10 cm. wide, dull green, obtuse, scarcely undulate; leaves red, subulate, 3 cm. long; areoles 1.5 to 3 cm. apart, scarcely elevated, about 2 mm. in diameter, spineless, or bearing 1 to 4 acicular yel- low spines 2 cm. long or less when young; glochids few and short; flower about 6 cm. broad; petals obovate, rose-tinted below, yel- lowish rose above; sepals dark rose, whitish margined. Distribution: Rocky slopes, The Bright, Cat Island, Ba- hamas, collected by N. L. Britton and C. F. Millspaugh, March 1907, No. 5794. ; This plant was tentatively referred by us (Smiths. Misc. Coll. 50: 525. 1908) to Opuntia lanceolata Haworth. It has been grown under glass at New York ever since, but does not respond well to greenhouse conditions. an It is here included in the series Spinosissimae, but with hesitation, its bushy habit and larger flowers being anomalous in this group. a - Figure 254 represents a joint of the type specimen above cited; figure 255 is copie from a sketch of a flower made by Dr. Millspaugh on Cat Island, when the plant was discovered. 231. Opuntia macracantha Grisebach, Cat. Pl. Cub. 116. 1866. . | Erect, the trunk up to 15 cm. in diameter, its areoles 1 to 2 cm. broad, bearing many brownish glochids and several divergent spines 15 cm. long or less; upper portion of t he prank, an fhe ultimate, oblong, or oblong-ovate, spreading branches flat, green, faintly s uining, t he arcoles 2 to 3 cm. apart, scarcely elevated, the numerous glochids brown, spines I to 4, up ° s lon Be early white, stout, subulate, or wanting; flowers often numerous; ovary 2.5 to 3 cm. long, sel} with glochid-bearing areoles; petals orange-yellow, 1 to 1.3 cm. long. Type locality: Cuba, in maritime depressions. Distribution: Southern coast of eastern Cuba and adjacent plains. oD rere AO Fic. 253.—Opuntia nashii. 204 THE CACTACEAE. Specimens of the plant were erroneously referred by Grisebach to O. triacantha. It is a picturesque feature of the flora of its native habitat. Figure 256 is from a photograph of the plant on the United States Naval Station, Guantanamo Bay, Cuba, taken by Marshall A. Howe in 1909; figure 2 57 is from a pho- tograph of a plant from the same place, grown at the New York Botanical Garden. Fic. 254.—Joint of Opuntia Fic. 255.—Flower Fic. 256.—Opuntia macracantha. bahamana. of the same. 232. Opuntia spinosissima Miller, Gard. Dict. ed. 8. No. 8. 1768. Cactus spinosissimus Martyn, Cat. Hort. Cant. 88. 1771. Consolea spinosissima Lemaire, Rev. Hort. 1862: 174. 1862. Erect, up to 5 m. high, the trunk sometimes 8 cm. in diameter, densely clothed with areoles bearing many long brownish glochids and acicular, deflexed or spreading spines up to 8 cm. long; ultimate branches flat, dull green, narrowly oblong, 2 to 4 times as long as wide, their areoles 1 to 1.5 cm. apart, slightly or not at all elevated, bearing brown glochids and 1 to 3 acicular, straw-col- ored or whitish spines 8 cm. long or less, or spineless; ovary 3 to 8 cm. long, often flattened, its areoles bearing short glochids; petals about 1 cm. long, oblong-obovate, rounded at the apex, at first yellow, turning dull red. Type locality: Jamaica. Distribution: Southern coast of Jamaica. Plate xxxvi, from a painting by Miss H. A. Wood at Hope Gardens, Jamaica, sent by William Harris in 1907. Figure 258 is from a photograph of a plant obtained by Professor John F. Cowell in Jamaica and sent from the Buffalo Botanical Garden to the New York Botanical Garden in 1904. 233. Opuntia millspaughii Britton, Smiths. Misc. Coll. 50: 51 3. 1908. Trunk terete, 7 cm. thick at base, 5 cm. thick at top, 6 dm. high or less, branching at the summit, the branches divaricate-ascending, narrowly oblong, much compressed, 40 cm. long or less, 5 tO PLATE XXXVI BRITTON AND ROSE OI * - Opunita spinosissima. 6. Flowering joint. Single flowers. 7. Style. Longitudinal section of flower. H. A. Wood del. Cross-section of ovary. 1 2,3 Ae. 5 OPUNTIA. 205 10 cm. wide, 1 to 1.5 cm. thick, light green; branchlets obliquely lanceolate, obtuse, as wide as the branches, but shorter, 1 cm. thick or less, floriferous at and near the apex; areoles of the older branches pitted, about 1 cm. apart, those of very young shoots slightly elevated, the glochids very short, yellowish brown; spines of the trunk 15 cm. long or less, very numerous and densely clothing the trunk, very slender, gray, mostly strongly reflexed, pungent, those of the branches and branch- lets restricted to the areoles on their edges, shorter than those of the trunk but similar, purple when F O tia macracantha Fic. 258.—Opuntia spinosissima. “IG. 257.—Opuntia acé a. 3 S imson-lake, 1 cm. young, those of the fruit yellowish gray, 2 cm. long or less, flowers cupulate, crimson-lal » 1 cm. wide; sepals fleshy, ovate, acute, 4 mm. long and wide; petals erect-ascenc ings obe ate, mucro- nulate, about 4 mm. wide; stamens half as long as the corolla; style about as ong as ne olla, i 5 y ¢ .5 cm. , - stigma-lobes oblong, yellowish crimson, fruit compressed-obovoid, 2 cm. long, 1.5 ing one or two spines at most of the areoles. 206 THE CACTACEAE. Type locality: Rock Sound, Eleuthera Island, Bahamas. Distribution: Eleuthera and Great Ragged Island, Bahamas; Cayo Paredén Grande, Cuba. Figure 259 is from a photograph of the type plant taken at the type locality by Dr. C. F. Millspaugh, February 22, 1907. 74 = 234. Opuntia moniliformis (Linnaeus) Haworth in Steu- del, Nom. ed. 2. 2: 221. 1841. Cactus moniliformis Linnaeus, Sp. Pl. 468. 1753. Cactus ferox Willdenow, Enum. Pl. Suppl. 35. 1813. Opuntia ferox Haworth, Suppl. Pl. Suce. 82. 1819. Cereus moniliformis De Candolle, Prodr. 3: 470. 1828. Consolea ferox Lemaire, Rev. Hort. 1862: 174. 1862. Opuntia microcarpa Schumann, Gesamtb. Kakteen 714. 1898. Not Engelmann. 1848. Nopalea moniliformis Schumann, Gesamtb. Kakteen 750. 1898. Opuntia testudinis-crus Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 10: 389. 1904. Opuntia haitiensis Britton, Smiths. Misc. Coll. 50: 513. 1908. Trunk somewhat flattened above, 3 to 4 m. high, branching at the top, densely armed with acicular, yel- lowish or gray spines 12 cm. long or less, their bases clothed with yellowish-white wool 1 to 2 cm. long; joints obliquely linear-oblong to obovate, 1 to 3 dm. long, 13 cm. wide or less, about 1 cm. thick, obtuse, distinctly areolate- reticulate, the areoles somewhat elevated, 1 to 1.5 cm. apart, those of young joints bearing near the edges 3 to 6 acicular spines 1 to 2.5 cm. long, those on the sides of the young joints often spineless or with 1 to 3 yellowish Fic. 260.—Opuntia moniliformis on the plain at Azua, Santo Domingo. OPUNTIA. 207 spines, and with small tufts of grayish wool; older joints bearing at all areoles 5 to 8 yellowish spines similar to those of the trunk, and brown glochids 6 or 8 mm. long; flowers about 2.5 cm. broad; sepals as broad as long, or broader, apiculate; petals yellow to orange, ovate, apiculate, spreading; stamens much shorter than the petals; ovary cylindric to obovoid-cylindric, terete or nearly so, 4 to 5 cm. long, its distinctly elevated areoles close together, only 5 or 6 mm. apart, bearing brown glochids 2 mm. long, but no spines; fruit oblong-obovoid, about 6 cm. long. Type locality; Hispaniola. Distribution: Hispaniola; Desecheo Island, Porto Rico. The ovaries, fruits and small joints of this species are readily detached and on falling to the ground strike root and proliferate, forming masses of subglobose or turgid joints entirely different in aspect from the fully developed, tree-like plant. It was on this stage of the organism that the Cactus moniliformis of Linnaeus, founded on Plumier’s convention- alized plate above cited, was based; this illustration is, however, apparently erroneous in showing the style as long-exserted. The names Opuntia dolabriformis and Opuntia cruciata were published by Pfeiffer (Enum. Cact. 167. 1837) as synonyms of O. ferox. Some of the joints and, perhaps, some whole plants of this species are nearly or quite spineless. Illustrations: Descourtilz, Fl. Med. Antill. ed. 2. 7: pl. 514, as Cactier moniliforme; Plumier, Pl. Amer. ed. Burmann. pl. 198, as Cactus, etc. Fic. 262.—Opuntia monili- — i ili is. ‘The same species as 260, but ( Fic. 261.—Opuntia moniliformis pe b2.—Opuntia m showing a different mode of growth. of a plant at Azua, Santo Domingo, taken by from a photograph taken by Frank E. Lutz on ing a mass of proliferating e; figure 262 Figure 260 is from a photograph Paul G. Russell in 1913; figure 261 1s I Desecheo Island, Mona Passage, Porto Rico, in 1914, show sterile ovaries or small joints below and the mature stage of the plant abov represents several of the small joints of the Desecheo plant. 208 THE CACTACEAE. 235. Opuntia rubescens Salm-Dyck in De Candolle, Prodr. 3: 474. 1828. Opuntia catacantha Link and Otto in Pfeiffer, Enum. Cact. 166. 1837. Consolea rubescens Lemaire, Rev. Hort. 1862: 174. 1862. Consolea catacantha Lemaire, Rev. Hort. 1862: 174. 1862. Opuntia guanicana Schumann in Giirke, Monatsschr. Kakteenk. 18: 180. 1908. ‘Trunk erect, nearly cylindric below, flattened above, 3 to 6 meters high, sometimes 1.5 dm. in diameter, branching above, its areoles bearing several or many acicular spines up to 8 cm. long or more, or spineless: ultimate joints thin and flat, mostly dark green or reddish green, not reticulate- areolate except when young, oblong to oblong-obovate, 2.5 dm. long or less, mostly 2 to 4 times as long as wide, the terminal ones often much smaller; areoles 1 to 1.5 cm. apart, bearing several acicular nearly white spines 1 to 6 cm. long, or spineless; flowers yellow, orange or red, about 2 cm. broad; ovary long-tuberculate, 4 to 5 cm. long, about 1.5 cm. in diameter; petals obovate, apiculate; sta- mens about half as long as the petals; fruit reddish, obovoid or subglobose, 5 to 8 cm. in diameter, spiny or spineless; seeds suborbicular, 6 to 8 mm. in diameter. Fics. 263, 264.—Opuntia rubescens. Type locality: Cited as Brazil, but erroneously. Distribution: Mona and Porto Rico to Tortola, St. Croix, and Guadeloupe. Culebra, St. Thomas, St. Jan, and Montserrat plants agree with the description of Opuntia rubescens, which clearly belongs with the Spinosissimae (( ‘ruciformes), as pointed out by Berger, rather than with the South American series J narmatae, where it was placed by Schumann; it is a spineless state of O. catacantha, as was conclusively proven by us through field observations in the Virgin Islands, and greenhouse plants of O. rubescens develop spines. Both the spiny and spineless races exhibit remarkable proliferation of the ovaries, these often forming chains of several joints while attached to the plant; these, falling to the ground, strike root and form many small, flattened joints 2 to 4.cm. long as in Opuntia moniliformis, to which this species is otherwise closely related. " Illustration: Journ. N. Y. Bot. Gard. 7: f. 6, as Opuntia. OPUNTIA. 209 Figure 263 is from a photograph of the plant taken by Professor John F. Cowell at Guanica, Porto Rico, in 1915; figure 264 is from a photograph taken by Professor Cowell at the same time and place, showing in the foreground a mass of young plants arisen from proliferating joints, and a mature plant behind; figure 265 represents proliferating joints of a plant grown at Nisky, St. Thomas, collected by Dr. Britton and Dr. Rose in 1913; figure 266 represents a fruit, collected by Dr. Britton and Dr. Shafer on Buck Island, St. Thomas, in 1913. Fics. 265, 266.—Opuntia rubescens. Xo0.66. Fic. 267.—Opuntia brasiliensis. Xo.75. Series 27. BRASILIENSES. This series represents one of the five subgenera described by Dr. Schumann, which he called Brasiliopuntia. It perhaps should be recognized as a distinct genus. We recognize three species in the series, which may be races of a single one, characterized by an erect cylindric trunk with cylin- dric, horizontal branches terminating in a series of flattened, thin, leaf-like branches. The leaves are small and caducous. ‘The spines are few on the young growth, but large clusters are developed on the old stem and trunk. ‘The flowers are small, the fruit is juicy, and the seeds are large and covered with a dense mass of wool. Unlike most species of Opuntia, these grow in the moist tropical forests, forming tall, slender, tree-like plants. KEy TO SPECIES. Fruit globular, yellow... 0.000. ene ee ene eee eee e eee Fruit clavate to oblong, red. 0. baliensé Fruit oblong, 3 to 4.cm. long. ... 2.0.0... eee 237. O. bahiensis Fruit clavate, 5 cm. long........0.0 0.00 nett eee ees 238. O. argentina \ 036. Opuntia brasiliensis (Willdenow) Haworth, Suppl. Pl. Succ. 79. 1819. Cactus brasiliensis Willdenow, Enum. Pl. Suppl. 33. 1813. Cactus paradoxus Hornemann, Hort. Hafn. 2: 443. 1815. Cactus arboreus Vellozo, Fl. Flum. 207. 1825. Opuntia arborea Steudel, Nom. ed. 2. 2: 220. 1841. Cereus paradoxus Steudel, Nom. ed. 2. 1: 335. 1841. Becoming 4 meters high, with a cylindric woody trunk and a small rounded top; old trunk either naked or spiny; branches dimorphic, the lateral ones horizontal, terete; the terminal joints flat and leaf-like, many of these in time dropping off; flowers 5 to 5.5 cm. long; petals yellow, oblong, obtuse; filaments very short; fruit yellow, globular, 3 to 4 cm. in diameter, with a low or nearly trun- cate umbilicus, bearing large areoles; seed usually one, very woolly, 10 mm. broad. 236. O. brasiliensis Type locality: Near Rio de Janeiro, Brazil. 7 Distribution: Southern Brazil, Paraguay, Argentina, and central Bolivia. Natural- ized in southern Florida. 210 THE CACTACEAE. A number of varieties of this species appear in literature, of which we may mention the following: minor Pfeiffer (Enum. Cact. 169. 1837); schomburgkit Salm-Dyck (Cact. Hort. Dyck. 1849. 74. 1850); spinosior Salm-Dyck (Hort. Dyck. 184. 1834); tenuifolia Forbes (Hort. Tour Germ. 159. 1837); and tenuior Salm-Dyck (Hort. Dyck. 376. 1834). Dr. John H. Barnhart recently called our attention to a number of cactus names published by St. Hilaire which have been overlooked by later writers. One of these, Cactus heterocladus St. Hilaire (Voy. Rio de Janeiro and Minas Geraes 2: 103. 1830) seems to belong here, as the following free translation would indicate: ‘‘ Another cactus, which I have already seen near Rio de Janeiro, raised its branches in the midst of tortuous lianas; its trunk, which grows more slender from the base to the summit, is covered with fascicles of spines arranged in a quincunx, and it shows various stages of verticillate, hori- zontal, rounded branches, to the number of seven in each whorl; these brariches, like those of the spruce tree, grow shorter toward the summit of the plant, and they bear sec- ondary branches, flattened and oval-oblong, which may in a certain sense be taken as leaves.”’ Illustrations: Curtis’s Bot. Mag. 61: pl. 3293; Dept. Agr. N.S. W. Misc. Publ. 253: pl. [6]; Martius, Fl. Bras. 4?: pl. 61; Pfeiffer and Otto, Abbild. Beschr. Cact. 1: pl. 29; Schumann, Gesamtb. Kakteen f. 100; Vellozo, Fl. Flum. 5: pl. 28, this last as Cactus arboreus. > figure 2, represents a flowering joint taken from a specimen in the New York Botanical Ll2lé X&XM/ Fic. 268.—Opuntia brasiliensis. Fics. 269, 270.—Opuntia bahiensis. Xo.5. Garden; figure 3 is from the same plant, showing terete and flat joints. Figure 267 repre- sents a fruit collected by Dr. Rose near Iguaba Grande, Brazil, in 1915; figure 268 is from a photograph taken by Paul G. Russell in a public park in Bahia, Brazil. 237. Opuntia bahiensis sp. nov. Trunk 3 to 15 meters high, cylindric, 20 to 25 cm. in diameter, tapering gradually upward; the center of trunk pithy, hollow in age, surrounded by an open woody cylinder: lateral. joints terete, the terminal ones flat and thin, ovate to oblong; leaves small, 2 to 3 mm. long, turgid; spines on terminal joints, if present, 1 or 2, slender, red at first, then brown; spines on old trunk forming large clusters at all the areoles; flowers not seen; fruit deep red both within and without, oblong, 3 to 4 cm. long; its small areoles with brow i : ran wo BF eS own glochids; fruit, very hairy, thick, 8 mm. broad. g s; seeds 1 to 5, mostly 1 or 2 in each Collected in the vicinity of Toca da Onca, Bahia, Brazil, by Rose and Russell, June 27 to 29, 1915 (No. 20068). OPUNTIA. aI1 _ Figure 269 represents joints of the type plant above cited; figure 270 represents a joint with fruit; figure 271 is from a photograph of the type specimen. Fic. 271.—Opuntia bahiensis. The tree to the left and Fic. 272.—Opuntia ammophila. somewhat in the foreground. 238. Opuntia argentina Grisebach, Abh. Ges. Wiss. Gottingen 24: 140. 1879. Opuntia hieronymi Grisebach, Abh. Ges. Wiss. Gottingen 24: 140. 1879. Erect, 5 to 15 meters high, branching at the top, the lateral branches subverticillate, teretes terminal branches flat, 5 to 12 cm. long, 3 to 8 cm. broad; ovary 2 to 2.5 cm. long; petals elliptic to spatulate, 1.8 cm. long, 8 mm. broad, greenish yellow; filaments white; style white; stigma-lobe; yellowish green; ovary flattened, tuberculate, deeply umbilicate; fruit clavate, 5 cm. long, dull purplish violet, with wine-colored pulp; seeds lens-shaped, 5 to 6 mm. long, 2.5 to 3 mm. broad. Type locality: Near San Andrés, Oran, Argentina. Distribution: Northern Argentina. This species was considered identical with O. braszli- ensis by Schumann, but they separate on very good fruit characters. Figure 274 is from a photograph of a flowering branch furnished by Dr. C. Spegazzini. Series 28. AMMOPHILAE. One peculiar species, native of Florida, constitutes this series, characterized by a continuous erect subterete trunk, flat, spiny branches, and large, yellow flowers. 239. Opuntia ammophila Small, Journ. N. Y. Bot. Gard. 20: 29. 191g. Plant erect, more or less branched throughout or ultimately 1G. 273.—Opuntia ammophila. with a stem 1 to 2 meters tall or more, becoming 2 to 2.5 dm. in diameter, bearing several spreading branches near the top, thus tree-like, joints various, those of the main stem elongate, ultimately fused on the those of the branches typically obovate or cuneate, varying to elliptic or ov long, becoming grayish green; leaves stout-subulate, 6 to 10 mm. long, green; tuberous at the base; ends and subcylindric, al, thickish, 5 to 17 cm. areoles relatively 212 THE CACTACEAE. numerous, conspicuous on account of the densely crowded long bristles, especially on the older joints, the marginal ones, at least, armed; spines very slender, solitary or 2 together, reddish or red, at maturity gray, mostly 2 to 6 cm. long, nearly terete, scarcely spirally twisted; flowers sev- eral on a joint; sepals lanceolate, acute or slightly acuminate; buds sharply pointed; corolla bright yellow, 5 to 8 cm. wide; petals obovate, cuneate, notched, and prominently apiculate, 3 cm. long, scarcely erose; stigma-lobes cream-color; berries obovoid, 2 to 3 cm. long, more or less flushed with reddish purple, many-seeded; seeds about 4 mm. in diameter. Fic. 274.—O ia < inc . 74 puntia argentina. Fic. 275.—Opuntia chaffeyi. Photograph _ by Sefior Don Teodoro Chairez. Type locality: Fort Pierce, Florida. Distribution: Inland sand-dunes (scrub), peninsular Florida. 7 he plant was first collected by Dr. Small near Fort Pierce, Florida, in 1917, and again studied by him in its more northern range west of St. George in 1918. | He describes it as the most conspicuous native prickly pear of Florida, always viciously armed and with a char- acteristically unjointed trunk. In spite of its many slender spines, cattle browse upon it. Illustration: Journ. N. Y. Bot. Gard. 20: pl. 224. OPUNTIA. 213 Figure 272 is from a photograph of the plant taken by Dr. Small near Fort Pierce, Florida; figure 273 shows a fruiting joint of the type specimen. Series 29. CHAFFEYANAE. This series contains a single Mexican species, differing from all the other opuntias in having an annual stem which arises from a large, fleshy root or rootstock. ‘The joints, which are elongated and nearly terete, resemble somewhat those of O. leptocaulis, but are more fleshy, while the flowers and fruit are like those of the platyopuntias. 240. Opuntia chaffeyi Britton and Rose, Contr. U. S. Nat. Herb. 16: 241. 1913. Perennial by a large, fleshy, deep-seated root or rootstock often 35 cm. long by 4 cm. in diam- eter; stems normally annual, 5 to 15 cm. long, sometimes in cultivated specimens 25 cm. long, much branched, often weak and prostrate; joints elongated, 3 to 5 cm. long, 6 to 7 mm. broad, slightly Fic. 276.—Opuntia chaffeyi. i ish; i : les small labrous, pale bluish green or sometimes purplish ; leaves minute, caducous; areo ; , Civeuley Wet white woo! in the lower parts and brown wool in the upper parts spines I, rarely 2 oF 3, acicular, 2 to 3 cm. long, whitish or pale yellow; glochids numerous, pale yel “ : on or uds, in cluding ovary, 8 cm. long; flower opening at 10 a. m., closing at 2p. m., 6 cm. broad’ sepa “ic oe ovate to oblong, greenish; petals few, 7 to o, Het eee etling Cert the cham s : on the rutside; filaments numerous, about 1 cm. long; style slender, ex S ; S, j t 22m . len at base; ovary deeply umbilicate, somewhat club-shaped, 4 0 5 em. los g, berets tattered tapereles and large areoles filled with white wool ; upper areoles on ovary bearing also white bristly spines; ovules numerous, borne in the upper third of the ovary; fruit and s still unknown. | Type locality: Hacienda de Cedros, near Mazapil, Zacatecas, Mexico. Distribution: State of Zacatecas, Mexico. Illustration: Contr. U. S. Nat. Herb. 16: pl. 72. 214 THE CACTACEAE. Figure 275 is from a photograph of part of the original collection as grown by Dr. E. Chaffey, taken and contributed by Sefior Don Teodoro Chairez, of Ciudad Lerdo, Mexico; figure 276 is from a photograph of the type showing the large root and the young shoot. As stated in the original description, this is a remarkable Opuntia, being the only one known which has an annual stem. In cultivation, where the plant is grown under abnor- mal conditions, the stem persists for more than a year; but Dr. Chaffey assures us that in the desert, where the species grows naturally, the stem dies down to the ground in the dry season. We have had it in cultivation since 1910, but it does not do well, and is gradually dying out. It has not been found in flower in a wild state, but it flowered with Dr. Chaffey at Ciudad Lerdo, Durango, Mexico, in 1915. Dr. Chaffey, who has been studying this spe- cies for several years, has made a number of interesting observations; he states that the large base, which usually is found 15 to 20 cm. beneath the surface of the ground, when allowed to grow above the ground develops clusters of spines like those on the normal stems, and finds that the plant is easily started from cuttings which soon develop the normal, large, underground part. He further states that the desert turtle eats this plant. It is well known that the Galapagos turtles feed upon the native opuntias of those islands. The native name of this plant is sacacil. The following described Opuntias we have been unable to refer to any of the species otherwise mentioned in this work: Opuntia bicolor Philippi, Linnaea 33: 83. 1864. glaucophylla Wendland, Cat. Hort. Herrenh. 1835. laevior Salm-Dyck, Cact. Hort. Dyck. 1844. 46. 1845. longiglochia C. Z. Nelson, Galesburg Register. July 20, 1915. lucida Hortus, Wiener Illustr. Gartenz. 14: 146. 1889. prostrata spinosior Schumann, Gesamtb. Kakteen 723. 1898. Spinaurea Karwinsky in Salm-Dyck, Cact. Hort. Dyck. 1844. 46. 1845. As synonym for O. pseudotuna elongata Salm-Dyck. tuberculata Haworth, Suppl. Pl. Suce. 80, 1819, first described as Cactus tuberculatus (Enum. Hort. Berol. Suppl. 34. 1813). The following names of Opuntia are chiefly found in catalogues or in lists, or have been so briefly described that we have not been able to identify them, and it does not seem worth while even to cite the places where they first occur in literature: Opuntia alpicola Schumann Opuntia missouriensis elongata Salm-Dyck americana Forbes erythrostemma Haage and Schmidt attulica Forbes salmonea Haage and Schmidt barbata K. Brandegee montana Sencke barbata gracillima K. Brandegee morenoi Schumann bernhardinit Hildmann myriacantha Link and Otto. Not Weber betancourt Murillo ottonis Salm-Dyck calacantha pachyarthra flava Haage and Schmidt calacantha rubra pachyclada rosea Haage and Schmidt carolina Forbes Spaethiana Haage and Schmidt ciliosa Forbes parote Forbes consoleana Todaro consolei Haage and Schmidt demorenia Forbes demoriana Forster deppei Wendland dichotoma Forbes eborina Forster erecta Schumann festiva Sencke ficus-indica albispina Haage and Schmidt flavispina Forster hevernickii Hildmann hitcheniit Forbes italica Tenore joconostle Haage and Schmidt jussieuiit Haage leucostata Forbes macrophylla Haage and Schmidt piccolomini Hort. platyclada Haworth praecox Forbes protracta Lemaire elongata Salm-Dyck pseudococcinellifer Bertoloni pseudotuna Salm-Dyck elongata Salm-Dyck spinosior Salm-Dyck pulverata Forster reptans Karwinsky salmii Forbes schomburgkii Salm-Dyck speciosa Steudel spinuliflora Salm-Dyck spinulosa Salm-Dyck straminea Sencke stricta spinulescens Salm-Dyck subinermis Link OPUNTIA. 215 Opuntia clavata Philippi (Anal. Univ. Chile 41: 722. 1872), O. ottonis G. Don (Hist. Dichl. Pl. 3: 172. 1834), O. phyllanthus Miller (Gard. Dict. ed. 8. No. 9. 1768), O. salicor- nioides Sprengel (Pfeiffer, Enum. Cact. 141. 1837), and 0. spiniflora Philippi (Linnaea 30: 211. 1859) are of the tribe Cereeae. ( 3 ) 7- GRUSONIA F. Reichenbach in Schumann, Monatsschr. Kakteenk. 6: 177. 1896. A low, much branched cactus, the branches terete, jointed, and ribbed; areoles borne on the tops of the ribs, very spiny, but all except the flowering ones without glochids, subtended by small deciduous leaves; corolla rotate, yellow; fruit baccate. This was first described as a Cereus from specimens collected by Mrs. Anna B. Nickels in 1895, then as a new genus Grusonia, and lastly as an Opuntia. It clearly is not Cereus, but when growing might easily be mistaken by its habit for Echinocereus. The leaves, glochids, flowers, and fruit are those of Opuntia, but its ribbed stem is unlike that of any known species of that genus. 1. Grusonia bradtiana (Coulter). Cereus bradtianus Coulter, Contr. U. S. Nat. Herb. 3: 406. 1896 (April). Grusonia cereiformis F. Reichenbach in Schumann, Monatsschr. Kakteenk. 6:177. 1896 (December). Opuntia bradtiana K. Brandegee, Erythea 5: 121. 1897. Opuntia cereiformis Weber, Dict. Hort. Bois 897. 1898. Forming dense, often impenetrable thickets 2 meters high or less, very spiny; stems light green, 4 to 7 cm. thick, with 8 to 10 low, longitudinal, somewhat tuberculate ribs; areoles 1 to 1.5 cm. apart, 3 to 5 mm. in diameter; leaves linear, fleshy, green, 8 mm. long, early deciduous; spines 15 to 25, yellowish brown when young, soon becoming white, acicular, terete or slightly compressed, 1 to 3 cm. long, not sheathed, some of the longer ones reflexed; wool white, turning brown, early disappear- ing; corolla rotate, opening in bright sunlight, 3 to 4 cm. broad ; sepals ovate, acute, fleshy; petals bright yellow, spatulate, fringed; filaments brownish yellow; stigma-lobes 8, yellow; areoles of the ovary with long, yellow, weak spines, white wool, and yellow glochids; berry (according to Schu- mann) ellipsoid, deeply umbilicate; seeds not seen. Type locality: Plains of Coahuila, Mexico. Distribution: Coahuila, Mexico. ~ This species first appeared in print in the catalogue of Johannes Nicolai under the name of Grusonia cereiformis, but we are informed that there was no description and therefore it was not technically published. The same name next appears in the Monatsschrift fiir Kakteenkunde for 1894. Here Dr.Schumann wrote a long article about the name, especially condemning the loose manner in vogue of publishing new names without descriptions, but giving no characters of the plant, and as a matter of fact he did not then know it. Two months later this name again appears in this same publication, but without description. Two years later Dr. Schumann records seeing this plant and describes it briefly, although he does not approve of the name Grusonia. If the name is to be considered published, it should not date earlier than this (December 1896), although Dalla T orre and Harms accept the date of 1894. In 1898 Weber transferred the name to Opuntia, publishing it as Opuntia cereiformis; in the meantime Coulter (in 1896) published the name Cereus bradtianus for the plant and Mrs. Brandegee (in 1897) transferred it to Opuntia, calling it Opuntia bradtiana. ma: Sch Illustrations: Monatsschr. Kakteenk. 21: 121, as Opuntia bradtiana; Schumann, Gesamtb. Kakteen f. ror, as Opuntia cereiformis. Plate xxxul, figure 4, represents a joint of the plant collected by C. A. Purpus at Cerro de Cypriano, near Morano, Mexico, 1n 1910. APPENDIX. 3 a. Nopalea gaumeri sp. nov. (See page 37, ante.) About 3 meters high, much branched; joints small, linear-oblong or oblong-oblanceolate, 6 to 12 cm. long, 2 to 3 cm. broad, rather thin; areoles small, 1 to 2 cm. apart; spines very unequal, 5 to 20 mm. long, acicular, 4 to 12, yellowish when young; flower small, including ovary and stamens about 4 cm. long; sepals ovate, acute; petals oblong, 12 mm. long; stamens long-exserted; style longer than the stamens; stigma-lobes 6, greenish; fruit red, darker within, obovoid, 3 cm. long, its numerous areoles bearing spines and yellow glochids; umbilicus prominent, 1 cm. deep; seeds about 4 mm. broad, with a very narrow margin and a very thin testa. Yo » x4 | Be KK 4 cuts ss MUG gue ill, ysl liu PS Fics. 277 and 278.— Nopalea gaumeri. Xo.8. Collected by George F. Gaumer and sons near Sisal, Yucatan, March 1916 (No. 23250, type); also by Dr. Gaumer from Port Silam, 1895 (No. 647). Dr. Gaumer’s field note is as follows: ‘‘A coastal cactus, 10 feet high, much branched, * small-jointed and of slight build, not of robust build like the interior species. It blooms from February to June. The birds are very fond of the fruit and consume it as fast as it ripens.”’ Figures 277 and 278 show joints of the type-specimen. 77 a. Opuntia depauperata sp.nov. (See page ro1, ante.) Plant 1 to 2 dm. high, with a flattened, much branched top; joints dark green, readily detached, terete or slightly flattened, 3 to 12 cm. long, 2 to 3 em. thick, puberulent; spines on young joints 2 or 3, on old joints sometimes 6 at each areole, reddish to pale brown, acicular, 1 to 2.5 cm. long, nearly porrect; glochids tardily developing, conspicuous on old joints, yellow; ovary with a deep umbilicus. Collected by Dr. and Mrs. J. N. Rose north of the station of Zig Zag, along the railroad above Caracas, Venezuela, October 17, 1916 (No. 21751). This little cactus is very inconspicuous and only a few specimens were observed. The station is near the top of the mountains which separate the valley, in which Caracas lies, from the sea. The region here is not so dry as it is farther down on the seaward side of the mountains, but there are several other species of cacti associated with it. Figure 279 is from a photograph of type plant taken by Mrs. Rose; figure 280 shows a joint. A plant, apparently of this relationship, was collected by Dr. H. H. Rusby in r917 on granite rocks, narrows of Magdalena River, Colombia. The joints, however, are glabrous, only 2 to 3 cm. long, the young joints have numerous brown spines and the young areoles produce long white wool. Fic. 279.—Opuntia depauperata. 216 APPENDIX. 217 82a. Opuntia pestifer nom. nov. (See page 103, ante.) Cactus nanus Humboldt, Bonpland, and Kunth, Nov. Gen. et Sp. 6:68. 1823. Cereus nanus De Candolle, Prodr. 3: 470. 1828, Low and nearly prostrate but sometimes 2 dm. high, much branched; the joints very fragile, glabrous; young joints 2 to 5 cm. long, or when old up to 8 cm. long, nearly terete, 1 to 3 cm. in diameter, or when young flattened and 2 to 3 cm. broad, very spiny; spines 2 to 5 at each areole, acicular, brownish, 1 to 3 cm. long; glochids numerous, yellow; flowers and fruit unknown. Type locality: Near Sondorello and Guancabamba. In Humboldt’s time these places were in southern Ecuador, but they are now in northern Peru. Mstribution: Northern Peru to central Ecuador. Dr. Rose observed the plant in various places in Ecuador, usually at an altitude ranging from 1,000 to 1,500 meters. ‘The following col- lections were made: at Huigra (No. 22306); at Sibambe (No. 22433); and west of San Pedro, Province of Loja (No. 23352). This plant, although widely distributed and very common, has re. Bo Opuntia de- never been seen by botanists in flower or fruit. The joints, which , come loose easily, are freely distributed by animals. It is so small that, growing half- hidden in the grass, it is easily overlooked but very annoying when one comes upon it unawares. Humboldt speaks of its being troublesome to men and dogs. Fic. 281.—Opuntia pestifer. Xo.5. Kunth who described it as Cactus nanus referred it with hesitancy to the Section Cereus. De Candolle transferred it from Cactus to Cereus placing it in a new subgenus Opuntiacet along with C. moniliformis (which we know now is an Opuntia) and C. serpens. He thought these might represent a genus between Opuntia and Cereus. Schumann (Gesamtb. Kakteen 166) considered it an Opuntia but did not formally refer it to that genus. . This name should not be confused with Opuntia nana (Fl. Damatica 3:143. 1852) which is Opuntia opuntia. . . F igure 281 is from a photograph taken by George Rose at Sibambe, Ecuador, in 1918; figure 283 shows the joints of the same plant (Rose, No. 22433.) 218 THE CACTACEAE. 96 a. Opuntia discolor sp. nov. (See page 109, ante.) A low plant, forming small dense clumps; joints slender, 4 to 12 cm. long, 1.5 to 2.5 cm. in diameter, turgid, glabrous, dark green with dark purple blotches extending downward from the under margin of the areoles; spines 1 to 6, acicular, nearly porrect, somewhat variegated but mostly brown, 3 cm. long or less; glochids tardily developing but conspicuous on old branches, dark brown; flowers light yellow to orange-yellow, only 3 cm. long including the ovary; filaments white; style and stigma-lobes nearly white; fruit evidently very small, bright red. Fic. 282.—Opuntia discolor. This species is represented by two collections made by Dr. J. A. Shafer in 1917 which slightly differ from each other. They are No. 111, from sandy thickets, Santiago del Estaro, Argentina, February 23 (type), and No. 95, from gravelly hills near Tapia, Tucuman, February 9. Apparently common in dry sandy thickets, growing best under bushes where it is least dis- turbed. The joints easily become detached, sticking readily to any disturbing object. The species differs from Opuntia retrorsa in its more nearly terete joints and spreading spines. Figure 282 is from a photograph of the type plant; figure 284 represents a joint of the plant from near Tapia, Tucuman. 101 a. Opuntia guatemalensis sp. nov. (See page Fic. 283.—Opuntia 113, ante.) pestifer. Xo. 5. Fic. 284.—Opuntia discolor. Low, spreading plant, resembling O. decumbens, but joints glabrous and shining; joints deep green, sometimes with dark blotches below the areoles; areoles small, filled with brown wool, sub- tended by small leaves; spines 1 to 3 at the areoles, terete, acicular, shining white with blackish tips when young, soon gray, mostly deflexed, somewhat spreading; flower-buds reddish; flowers much smaller than those of O. decumbens; petals lemon-yellow, 2. 5 cm. long; stigma-lobes cream-colored. Collected by Dr. Glover B. Wilcox in 1909 while acting as surgeon on a ship plying between Guatemala and San Francisco. Living specimens were sent directly to Washing- ton and flowered there in April 1915. Figure 285 represents a joint of the type specimen. APPENDIX. 219 102 a. Opuntia pennellii sp. nov. (See page 115, ante.) Plant low; joints 1 to 1.5 cm. long, obovate, turgid, bright green; spines 1 or 2 at each areole, nearly porrect, subulate, 3.5 cm. long or less, white with dark tips; glochids not very conspicuous, yellowish. Collected near Magangue, coastal plain of Colombia, Department of Bolivar, at about 100 meters altitude, by Francis W. Pennell in 1918. Figure 286 shows a joint of the type plant. Here may belong herbarium specimens which we have seen from northern Colombia but with the material at hand it is impossible to determine them definitely. One of these was collected by William R. Maxon, April 10, 1906 (No. 3849) at Puerto Colombia. This plant is described as consisting of 3 to 6 joints, branching at the third or fourth joint, the joints all being in one place. The flowers are yellow and small, only about 4 cm. long, including the ovary. Another was collected by H. H. Smith near Bonda in 1898-1899 (No. 2728); this has joints very similar to those of Dr. Pennell’s plant. It is said to be from 2 to 4 feet high. . ; . (3 oa Wy : \ wy, N Ya | = Fic. 285.— Opuntia guatemalensis. Fic. 286.—Opuntia pennellii. Fic. 287.—Opuntia caracasana. X0.33- X0.5- Xo.5. 103 a. Opuntia caracasana Salm-Dyck, Cact. Hort. Dyck. 1849. 238. 1850. (See page 116, ante.) Stems low, bushy, 4 to 12 dm. high; joints oblong, 10 to 12.5 cm. long, turgid, pale green, “leaves squamiform, minute’; spines 2 to 4, unequal, 2.5 to 4 cm. long or less, pale yellow; flowers and fruit unknown. Type locality: Near Caracas, Venezuela. Distribution: Mountains about Caracas, Venezuela. The type specimens were collected near Caracas by E. Otto, prior to 1849. Dr. Rose found the plant abundant above Caracas in 1916. It usually grows on exposed hillsides near the top of the divide which separates Caracas from the coast, and it was especially common along the railroad just below the little station of Zig Zag. Several other cacti are to be found in this neighborhood, among which are O. elatior and O. de pau perata. Figure 287 shows a joint of the plant collected by Dr. Rose above Caracas in 1916. 104 a. Opuntia aequatorialis sp. nov. (See page 116, ante.) Bushy, much branched; 1 to 1.5 meters high; the branches spreading or recurved; joints nar- rowly oblong to obovate, 1.5 to 2 dm. long, 3 to 8 cm. broad, easily becoming detached; spines pale yellow, at first only 2 to 4 but more in age, subulate, 2.5 to 6 cm. long; flower-buds ovoid, acute, red; petals few, 8 to 10, orange-red, spatulate; filaments and style red; stigma-lobes cream-colored. ee 220 THE CACTACEAE. Collected in thickets on dry hills near Sibambe, Province of Chimborazo, Ecuador, by J. N. Rose and George Rose, August 29, 1918 (No. 22432). The locality at which this species is found is semiarid and a number of other cacti are associated with it, among which is the little O. pestifer, described on a preceding page. O. aequatorialis was not so common as some of the other species and was usually found growing up through open-branched bushes and was in this way more or less protected. Figure 288 is from a photograph of the type plant taken by George Rose; figure 289 shows one of its joints. 116 a. Opuntia lata Small, Journ. N. Y. Bot. Gard. 20:26. 1919. (See page 126, ante.) Plant prostrate, often radially branched, sometimes forming mats nearly a meter in width, the tip of the branches sometimes assurgent, with elongate cord-like roots; joints elliptic to narrowly obovate, often narrowly so, thick, 4 to 15 cm. long, deep green, sometimes glaucous, especially when young; leaves subulate, 6 to 11 mm. long, green or purple-tinged; areoles scattered, often conspicuous, sometimes very promi- nent and densely bristly, the marginal ones, at least, armed; spines slender, solitary or 2 together, pink, turning red or red-banded, at maturity gray or nearly white, nearly i> Fic. 289.—O. aequatorialis. Xo.4. Fic. 288.—Opuntia aequatorialis. Fics. 292 and 293.— Opuntia macateei. Fics. 290 and 291.—O. lata. Xo.4. 0.4. APPENDIX. 221 terete, slightly spirally twisted; flowers usually several on a joint, conspicuous; sepals subulate to lanceolate, acute; corolla yellow, 7 to 9 cm. wide; petals numerous, the inner ones broadly obovate to flabellate, erose at the broad minutely mucronate apex; berries clavate, 5 to 6.5 cm. long, red or reddish purple, many-seeded; seeds about 5 mm. in diameter. Type locality: Twelve miles west of Gainesville, Florida. Distribution: Pinelands, northern peninsular Florida. It was first observed by Dr. Small near Gainesville, Florida, in 1917, and plants were taken to Mr. Charles Deering’s cactus garden at Buena Vista, Miami, where it has grown luxuriantly, flowering and fruiting freely alongside of O. pollardii which it resembles in habit, but differs from in its long clavate berries and more numerous petals. Figure 290 shows joints of the plant; figure 291 shows its fruit. 127 a. Opuntia macateei sp. nov. (See page 133, ante.) Small prostrate plant; joints 2.5 to 6 cm. long, orbicular to obovate, glabrous, dull green, in age somewhat tuberculate; leaves linear, 10 mm. long or less, green; spines 1 to 3, brownish, the longer ones up to 2.5 cm. long; flowers, including the ovary, 8 to 10 cm. long, 7 to 8 cm. broad, yellow with a red center; ovary subcylindric, 5 to 6 cm. long, bearing conspicuous leaves, some- times 12 mm. long. Differs from related species by its small joints and slender, elongated, leafy ovaries. Collected by W. L. MacAtee at Rockport, Texas, December 28, 1910 (No. 1992). Figures 292 and 293 represent the joints and flower of the plant. 159 a. Opuntia soederstromiana sp. nov. (See page 154, ante.) Sometimes spreading and bushy, but usually erect, 6 to 10 dm. high, very spiny; joints obovate, 2 to 4 dm. long, bright green when young, or sometimes slightly glaucous, grayish green in age; leaves subulate, small, reddish at top; spines at first 2 to 5, but in age Io or more, when young reddish or pinkish at base and paler above, soon gray throughout, unequal, subulate, 4 cm. long or less; flowers at first yellow but soon orange to brick-red, rather large, 5 to 6 cm. long; petals few, about 10, ob- long, retuse; filaments and style red- dish; stigma-lobes pale green; fruit obovate to oblong, 4 to 5 cm. long, usually spiny, red, juicy, with a de- pressed umbilicus. Collected at San Antonio, Prov- ince of Quito, Ecuador, by J. N. Rose and George Rose, October 29, 1918 (No. 23559). This plant was first collected for us by Ludovic Séderstrom of Quito, at the request of the Presi- CY dent of the Central and South Amer- Fic. 294.—Opuntia soederstromiana. ican Cable Company. Although great care was taken in shipping the plants they all died in transit. s° visited Mr. Sdderstrom’s locality and collected herbarium, living, and formalin materia which has enabled us to describe the plant fully. The illustration here used was made at the same time. Figure 294 is from a photograph of the type plant taken by George Rose. In 1918 Dr. Rose 222 THE CACTACEAE. 161 a. Opuntia zebrina Small, Journ. N. Y. Bot. Gard. 20: 35. 1919. (See page 155, ante.) Plant erect, more or less branched throughout, fully 1 meter tall or less, the roots fibrous; joints oval or obovate, thickish, mostly 1 to 2 dm. long, deep green, sometimes obscurely glau- cous; leaves ovoid, 2 to 3 mm. long, bright green; areloes scattered, some of them, usually the lower ones, unarmed, the upper ones irregularly armed; spines slender, solitary or 2, 3, or 4, together, red-brown, finely banded, nearly terete, closely spirally twisted; flowers few on a joint, or soli- tary; sepals deltoid to deltoid-reniform or nearly reniform; corolla yellow, rotate, 6 to 7 cm. wide; petals rather numerous, the inner ones broadly obovate, undulate, minutely mucronate or notched at the apex; berries obovoid, not constricted at the base, 3.5 to 4.5 cm. long, red-purple; seeds many, 6 to 7 mm. in diameter. Fic. 295.—Opuntia zebrina. Type locality: Middle Cape Sable, Florida. Distribution: Coastal sand-dunes, Cape Sable, Florida, and the lower Florida Keys. The plant was first discovered by Dr. Britton on Boot Key, Florida, in 1909, and this is the most northern locality yet known for it. The spe- cies is interesting not only from its strikingly banded spines but also as being the only known member of the series Elatiores growing wild within the United States. In habit it resembles O. dillenii, and on Key West the u two species were observed growing close together. Fic. 296.—Fruit of [llustration: Journ. N. Y. Bot. Gard. 20: pl. 226. O- Zebrina. X0-5: Figure 295 is from a photograph of the plant on Cape Sable, Florida, in cultivation at Buena Vista, Miami, Florida; figure 296 shows a fruit collected by Dr. Rose on Key West, Florida, in 1918. 173 a. Opuntia keyensis Britton in Small, Journ. N. Y. Bot. Gard. 20: 31. 1919. (See p. 162, ante.) Plant erect, much branched, sometimes forming clumps 3 meters tall, with long fibrous roots; joints elliptic, oval, obovate, or spatulate, thick, 1 to 3 dm. long, bright green; leaves ovoid, 2 to 3 mm. long, green; areoles rather conspicuous, often relatively large and prominent, apparently unarmed; spines stout, 4 to 13 together, very short, mostly hidden in the bristles; at first pink, at maturity salmon-colored, slightly flattened; flowers solitary or 2 or 3 on a joint; sepals deltoid to subreniform, acute or acutish; corolla salmon-colored, cup-like, or short-campanulate, 3 to 3.5 cm. wide; petals rather few, thinner ones broadly obovate or orbicular-obovate, undulate, scarcely, if at all, mucronate; berries obovoid, 4 to 6 cm. long, purple; seeds numerous. APPENDIX. 223 Fic. 297.— Opuntia keyensis. Type locality: Boot Key, Florida. Distribution: Hammocks, Florida Keys and Cape Sable. Opuntia keyensis was first collected by Dr. Britton in 1909 on Boot Key, Florida. Plants brought subsequently by Dr. Small from the Keys to Buena Vista, Miami, and there observed by him under cultivation show the spe- cies to be distinct from either O. dillenii or O. stricta, with both of which it has been associated. Illustration: Journ. N. Y. Bot. Gard. 20: pl. 225. Figure 297 is from a photograph of the plant in cultivation at Buena Vista, Miami, Florida; figures 298 and 299 show its flowers, collected by Dr. Small on Key Largo, Florida, in 1909. See also plate xxx, figure I. 183 a. Opuntia bonplandii (HBK.) Weber, Dict. Hort. Fics. 298 and 209 ne of Opuntia Bois 894. 1898. (See page 168, ante.) yensis. “Se Cactus bonplandit Humboldt, Bonpland, and Kunth, Nov. Gen. et Sp. 6:69. 1823. - joints ovate to obovate, 2 to 3 dm. long, dull Plants tall, 2 to 4 meters high, open-branching; green; spines at first 2 to 7, pale yellow, acicular, 1 to I. colored, about 6 cm. long and nearly as broad when fully expanded; pe 5 cm. long but soon falling off; flowers orange- tals obtuse; stamens short. Type locality: Cuenca, Ecuador. Distribution: Feuador. This species was collected by Humboldt and Bonpland at Cuenca, Ecuador, and was first described as Cactus (Opuntia) bonplandii. Apparently the type was not pre- 224 THE CACTACEAE. served as Dr. Rose did not find it either at Berlin or Paris in 1912. Schumann mentions it only in a note under O. quitensis following Weber who associates the two. Dr. Rose, while in Ecuador in 1918, spent about a week at Cuenca collecting plants in all direc- tions from the town. The only Opuntia in this whole region is the one above described which grows in hedges and along the roadsides. It may be an introduced species which has escaped from gardens but we know nothing in cultivation just like it. It resembles Y yo Xe ; c \ © © — / : k e 6 oo ‘ a c © © e~ . -_ ” ZZ SN . ° © * e c i ~~ / (oe aN ail ) y SS ( {| Vv _ a _ Lit, Un, 5 on - ws * iG (i (KK . { ty, will Fic. 300.—Opuntia bonplandii. Xo.5. somewhat the Nopal de Castilla, so common in Mexico and the southwestern states Humboldt compared it with the tuna de Espana which may be the same. Bonpland seems to have called his plant Cactus coccinellifer which it very much resembles in the shape of the joints and in being spineless in age. If we are right in our interpretation of this species it has no close alliance with O. quitensis which Dr. Rose collected also: it has very small flowers with erect petals which are not readily affected by the sun as are those of O. bonplandii and most of the other species. - Fic. 301.—Opuntia dobbieana. APPENDIX. 225 Figure 300 shows a joint collected by Dr. Rose at Cuenca, Ecuador, in 1918. 207 a. Opuntia dobbieana sp. nov. (See page 187, ante.) Usually low and bushy, forming dense thickets, but sometimes tall and then 3 to 4 meters high; joints orbicular to short-oblong or obovate, 1 to 2.5 dm. long, pale green in color, very spiny; leaves minute, 1 to 2 mm. long, green, spreading; areoles small, closely set; spines white, 5 to 12, usually acicular but on old joints subulate, 1 to 3 dm. long, accompanied by 2 to 4 reflexed hairs from the lower side of the areole; flower, including ovary, 5 to 6 cm. long; petals chocolate-colored, oblong, 2 cm. long; filaments and style pinkish; stigma-lobes dull green; overy strongly tubercled, leafy, very spiny, especially towards the top; fruit juicy, red, at first spiny, 3 to 5 cm. long. Common in dry places from Huigra to Sibambe, Province of Chimborazo, Ecuador. Collected by J. N. Rose and George Rose, August to November 1918, at Huigra (No. 22201, type); at Sibambe, August 29 (No. 22434). This species, on account of its white spines, is referred to the Streptacanthae, although it usually is more bushy than these species generally are. So far as we could learn, the fruit is not used by the Ecuadoreans; the plant was never seen cultivated, and there is every reason to believe it is native to Ecuador. The species is named for John Dobbie, general manager of the Guayaquil and Quito Railway, whose courtesies and assistance added greatly to the success of Dr. Rose’s visit to Ecuador in 1918. Figures 301 and 302 (the latter at the bottom of this page) are from photographs of the type plant, taken by George Rose. .Cactales, 8 INDEX. (Pages of principal entries in heavy-face type.) Aaron’s beard, 175 Agave, 117 Ahoplocarpus, 11 Airampo, 161 Alfilerillo, 26 Ammophilae, 45, 211 Apple, 9 Aurantiacae, 45, 74, 106 Ayrampo, 135 Barbados gooseberry, 10 Basilares, 45, 118, 193 Beaucarnea, 117 Beaver-tail, 120 Bigelovianae, 44, 58 Blade apple, 10 Brasilienses, 45, 209 Brasiliopuntia, 209 Bullsucker, 43, 116 Cactaceae, 3, 8 Cacti, 5, 6, 7, 9, 28, 33, 39, 42, 49, 66, 67, 80, 87, 94, 95, III, 126, 137, 151, 216, 219, 220 Cactodendron, 42, 43 Cactus, 5, 6, 8, 9, 23, 30, 32, 34, 35) 43, 49, 87, 88, 93, 107, I13, 114, 116, 120, 121, 146, 164, 177, 186, 207, 210, 215, 216, 217, 221 Cactus, arboreus, 209, 210 aurantiacus, 107 bleo, 17, 63 bonplandii, 223 bradypus, 121 brasiliensis, 209 californicus, 58 chinensis, 156, 157 coccinellifer, 179, 224 cochenillifer, 34, 35, 173 compressus, 127 corrugatus, 95 curassavicus, 102 cylindricus, 63, 77 decumanus, 180 dillenii, 162, 163 eburneus, 95 elatior, 153 elongatus, 179 ferox, 199, 200, 206 ficus-indica, 177 fimbriatus, 13 foliosus, 105 fragilis, 193 frutescens, 27 heterocladus, 210 horridus, 21 humifusus, 127 humilis, 113 indicus, 156 lanceolatus, 179 linkii, 121 lucidus, 10 mammillaris, 4 microdasys, 120, 121 monocanthos, 156 227 Cactus—continued. moniliformis, 206, 207 nanus, 217 nigricans, 153 opuntia, 43, 115, 127, 128, 129, 163, 177 opuntia inermis, 161, 162 opuntia nana, 127, 128 opuntia polyanthos, 115 opuntia tuna, 157 opuntiaeflorus, 27 ottonis, 121 ovoides, 95 paradoxus, 209 pentlandii, 98 pereskia, 9, 10, I1 polyanthos, 113, 115 portulacifolius, 23 pseudococcinellifer, 153 pusillus, 105 rosa, 19, 20 rotundifolia, 27 salmianus, 74 sericeus, 134 spinosissimus, 204 strictus, 161 subinermis, 34 subquadrifolius, 65 sulphureus, 134 tomentosus, 173 triacanthos, 112 tuberculatus, 214 tuna, 113, 114, 163 tuna elatior, 153 tuna nigricans, 153 tunicatus, 65 urumbeba, 156, 157 urumbella, 157 zinniaeflora, 21 Camuessa, 191 Cane cactus, 43 Cephalocereus, 116 Cereeae, 8, 24, 215 Cereus, 58, 75, 151, 215, 217 articulatus, 89 bradtianus, 215 californicus, 58 chiloensis, 79 clavarioides, 73 cylindricus, 77 imbricatus, 63 moniliformis, 206, 217 nanus, 217 ovatus, 91 paradoxus, 209 sericeus, 73 serpens, 217 syringacanthus, 89 tunicatus, 66 Chaetophorae, 174 Chaffeyanae, 45, 213 Cholla, 43, 61 Clavarioides, 44, 72 é 4 228 THE CACTACEAE. Clavatae, 44, '79, 84 Cola de diablo, 26 Consolea, 42, 43, 202 catacantha, 208 ferox, 206 leucacantha, 175 rubescens, 43, 208 spinosissima, 204 Corotilla, 96 Cow’s tongue, 164 Criniferae, 140, 176 Cruciformes, 208 Cuija, 149 Curassavicae, 45, 102, 104, 106, 193 Cylindropuntia, 32, 44, 45, 49) 71, 75, 79, 84, 100, 142 Dildoes, 105 Dillenianae, 45, 159, 169 Durasnilla, 175 Echinocactus, 117 Echinocarpae, 44, 56 Echinocereus, 79, 215 Elatae, 45, 152, 156 Elatiores, 45, 149, 152, 155, 156, 222 Epiphyllum, 9 gaillardae, 6 Erythrina, 181 Espina, 76 Espina blanca, 41 Espinha de Sao Antonio, 19 Etuberculatae, 72, 73 Eupereskia, 10 Ficindica, 42, 43 Ficus-indicae, 45, 156, 166, 1'77, 191 Floccosae, 44, 86 Flor de Céra, 19 Frutescentes, 73 Fulgidae, 44, 67 Fulvispinosae, 148 Glomeratae, 44, 87 Grandifoliae, 9, 11 Grizzly bear cactus, 196 Grusonia, 24, 215 Grusonia bradtiana, 215 cereiformis, 215 Guamacho, 17 Harrisia, 24 Hibiscus, 19 Hibiscus esculentus, 19 Hylocereus, 24 Imbricatae, 44, 60 Inamoenae, 45, 125 Inarmatae, 208 Iniabanto, 19 Lemaireocereus, 116 Lemon vine, 10 Lengua de vaca, 164 Leon, 96 Leoncito, 96 Leptocaules, 44, 46, 49 Leucotrichae, 45, 174 Loranthus aphyllus, 79 Macdougalianae, 45, 169 Maihuen, 40 Maihuenia, 8, 24, 40-42, 43, 95 brachydelphys, 41, 42 patagonica, 41 philippii, 41 poeppigii, 41, 42 Maihuenia—continued. tehuelches, 41, 42 valentinii, 40, 41, 42 Malus, 9 Mammillaria, 4 Matéare, 13 Miquelianae, 44, 78 Mission cactus, 186 Najui de Culebra, 19 Nopal, 34 Nopal cardén, 184 Nopal de Castilla, 224 Nopalea, 8, 24, 33-39, 43, 155, 216 auberi, 34, 37, 38, 39 cochenillifera, 34, 181 dejecta, 34, 36, 37 gaumeri, 34, 37, 216 guatemalensis, 33, 34, 35 inaperta, 33, 34, 37, 38 karwinskiana, 34, 37, 38, 39 lutea, 33, 34, 35 moniliformis, 33, 206 Nopaleta, 26 Nopalnochetzli, 35 Ohulago, 103 Olago, 103 Opuntia, 8, 14, 24, 25, 30, 32, 33, 34, 38, 39, 40, 42-215, 217-224 acanthocarpa, 56, 57 aciculata, 160, 165 acracantha, 91 aequatorialis, 110, 116, 219) 220 affinis, 169, 170 airampo, 161 albicans, 191 albicans laevior, 191 albiflora, 73, 74 albisetosa, 134 alcahes, 58, 67, 69, 70 alfagayucca, 185 alfayucca, 185 allairei, 126 alpicola, 214 alpina, 33 alta, 165, 166 americana, 214 ammophila, 211 amyclaea, 112, 177, 181, 185 amyclaea ficus-indica, 177 anacantha, 107, 109, 110 anahuacensis, 169 andicola, 89, 90 andicola elongata, 89 andicola fulvispina, 89 andicola major, 89 andicola minor, 90 angusta, IOI angustata, 124, 129, 140, 142, 14¢ angustata comonduensis, 124 antillana, 110, 115, 163 aoracantha, 90, gI aquosa, 29 arborea, 209 arborescens, 43, 63, 64, 65 arborescens versicolor, 62 arbuscula, 47, 50, 51 arechavaletai, 156, 158 arenaria, 193, 194, 195 - Opuntia—continued. argentina, 209, 21I, 212 arizonica, 147, 148 arkansana, 128 articulata, 89 assumptionis, 159 atacamensis, 90, 94 atrispina, 140, 142 atropes, 169, 170 attulica, 214 auberi, 37 aulacothele, 95 aurantiaca, 101, 107 aurantiaca extensa, 107 australis, 87, 88 austrina, 45, 126, 130 azurea, 140, 143 bahamana, 202, 203, 204 bahiensis, 209, 210, 211 balearica, 161 ballii, 137 barbata, 214 barbata gracillima, 214 bartramii, 181 basilaris, 118, 119, 120, 136 basilaris albiflora, 120 basilaris coerulea, 120 basilaris cordata, 120 basilaris cristata, 120 basilaris nana, 120 basilaris nevadensis, 120 basilaris pfersdorffii, 120 basilaris ramosa, 119, 120 basilaris treleasei, 119 beckeriana, 168 bella, 110, III, 112 bentonii, 161, 163 bergeriana, 149, 152, 169 bernardina, 57, 81 bernardina cristata, 57 bernhardinii, 214 betancourt, 214 bicolor, 214 bigelovii, 58, 59 blakeana, 144, 145 boldinghii, 149, 155 boliviana, 71, 97, 98 bonaerensis, 156, 158 bonplandii, 160, 168, 223, 224 borinquensis, 102, 103, 104 brachyarthra, 193, 194 brachyclada, 120 brachydelphis, 42 bradtiana, 215 brandegeei, 25, 28 brasiliensis, 209, 210, 211 brasiliensis minor, 210 brasiliensis schomburgkii, 210 brasiliensis spinosior, 210 brasiliensis tenuifolia, 210 brasiliensis tenuior, 210 brunnescens, 149, 150 bulbispina, 79, 83 bulbosa, 131 burrageana, 67, 70 cacanapa, 165, 166 caerulescens, 51 caesia, 144 INDEX. Opuntia—continued. caespitosa, 127 calacantha, 214 calacantha rubra, 214 calantha, 136 californica, 58 calmalliana, 60, 61 calva, 89 camanchica, 144, 145 cananchica albispina, 144 camanchica luteo-staminea, 144 camanchica orbicularis, 144 camanchica rubra, 144 camanchica salmonea, 144 campestris, 90, 99 camuessa, I9I cafiada, 160, 167, 168 candelabriformis, 182 candelabriformis rigidior, 182 canina, 107, 108 cantabrigiensis, 121, 160, 167 canterai, 159 caracasana, 110, 116, 219 cardenche, 64 cardiosperma, 156, 157, 158 cardona, 184 caribaea, 47, 48, 49 carolina, 214 carrizalensis, 79 castillae, 185, 186 catacantha, 43, 208 cereiformis, 79, 215 cervicornis, 194 chaetocarpa, 182 chaffeyi, 30, 212, 213 chakensis, 158 chapistle, 27 chavena, 184 chihuahuensis, 144, 145 chlorotica, 142, 159, 160, 161 chlorotica santa-rita, 142 cholla, 60, 61, 62 chrysacantha, 167 ciliosa, 214 ciribe, 58, 59, 60 clavarioides, 72, 73 clavarioides cristata, 73 clavarioides fasciata, 73 clavarioides fastigiata, 73 clavarioides monstruosa, 73 clavata, 79, 81, 215 clavellina, 52, 54 coccifera, 35 coccinea, 114 cochenillifera, 33, 34, 35 cochinelifera, 34 cochinera, 192 coerulea, 134 coindettii, 184 columbiana, 193 comonduensis, 118, 124 confusa, 147 congesta, 50 consoleana, 214 consolei, 214 convexa, 165 cordobensis, 181, 189 cornigata, 95 229 230 Opuntia—continued. corotilla, 96 corrugata, 90, 95 corrugata monvillei, 95 costigera, 65 covillei, 140, 145, 146 crassa, 1'78, 179 crassa major, 178 cretochaeta, 183 crinifera, 159, 176 crinifera lanigera, 176 cristata, 64 cristata tenuior, 64 cruciata, 207 crystalenia, 193 cubensis, 163 cucumiformis, 97 cuija, 149, 167 cumingii, 77 curassavica, 102, 103, 112 curassavica elongata, 102 curassavica longa, 102 curassavica major, 102 curassavica media, 102 curassavica minima, 102 curassavica minor, 102 carassavica taylori, 103 curvospina, 160 cyanella, 165, 166 cyclodes, 147, 148 cycloidea, 128 cylindrica, 71, 75, '77 cylindrica cristata, 78 cylindrica cristata minor, 78 cylindrica monstruosa, 78 cylindrica robustior, 78 cymochila, 131, 132 dactylifera, 97, 98 darrahiana, 102, 106 darwinii, 88, 90, 93, 94, 97 davisii, 52, 54, 55 deamii, 181, 187 decipiens, 63, 65 decipiens major, 64 decipiens minor, 65 decumana, 157, 180, 181, 186 decumbens, 111, 116, 117, 121, 218 decumbens irrorata, 117 decumbens longispina, 117 deflexa, 157 dejecta, 37 delaetiana, 149, 152 delicata, 126, 132, 133 deltica, 165 demissa, 146, 147 demorenia, 214 demoriana, 214 depauperata, 100, 101, 216, 217, 219 deppei, 214 depressa, 111, 117, 118 deserta, 57, 58 diademata, 89, 90 diademata calva, 89 diademata inermis, 89 diademata oligacantha, 89 diademata polyacantha, 89 dichotoma, 214 diffusa, 37 THE CACTACEAE. Opuntia—continued. digitalis, 72 diguetii, 26, 29 dillei, 147, 148 dillenii, 106, 114, 115, 116, 159, 162, 163, 181, 222, 223 dillenii minor, 163 dillenii orbiculata, 163 dimorpha, 96 diplacantha, 184 discata, 140, 149 discolor, 107, 109, 218, 219 distans, 149, 155 dobbieana, 181, 187, 224, 225 dolabriformis, 207 drummondii, 102, 104, 106 dulcis, 165, 166 durangensis, 169 eborina, 214 eburnea, 95 echinocarpa, 56, 57, 81 echinocarpa major, 57 echinocarpa nuda, 57, 58 echinocarpa parkeri, 57, 58 echinocarpa robustior, 57 eichlamii, 181, 187, 188 elata, 110, 156, 157 elata delaetiana, 152 elatior, 149, 153, 219 elatior deflexa, 157 ellemeetiana, 75 ellisiana, 166 elongata, 179, 181 elongata laevior, 180 emoryi, 80 engelmannii, 140, 147, 148, 149, 164, 165, 167 engelmannii cuija, 167 engelmannii cyclodes, 147, 148 engelmannii dulcis, 165 engelmannii littoralis, 165 engelmannii monstrosa, 148 engelmannii occidentalis, 146 eocarpa, 144 erecta, 214 erinacea, 193, 195, 196 erythrocentron, 174 exaltata, 71, 75, 76, 77 expansa, 147, 148 extensa, 107 exuviata, 63, 65 exuviata angustior, 63 exuviata major, 64 exuviata spinosior, 63 exuviata stellata, 63 exuviata viridior, 63 ferox, 206, 207 ferruginispina, 165 festiva, 214 ficus-barbica, 177 ficus-indica, 43, 156, 157, 177, 178, 181, 185, 189, 191 ficus-indica albispina, 214 ficus-indica amyclaea, 185 ficus-incida decumana, 180 ficus-indica gymnocarpa, 180 filipendula, 137, 138 flavicans, 191 flavispina, 214 flexibilis, 114 flexospina, 165 Opuntia—continued. floccosa, 71, 86, 87 floccosa denudata, 86, 87 floribunda, 74 foliosa, 105, 106 formidabilis, 91, 92 fragilis, 193, 194 fragilis brachyarthra, 193 fragilis caespitosa, 193 fragilis frutescens, fragilis tuberiformis, 193 frustulenta, 104, 105 frutescens, 47, 48 frutescens brevispina, 47, 48 frutescens longispina, 47, 48 fulgida, 67 fulgida mamillata,.67 fuliginosa, 149, 155 fulvispina, 174 fulvispina badia, 175 fulvispina laevior, 175 furiosa, 66 fuscoatra, 126, 133 fusicaulis, 191, 192 fusiformis, 130, 131 galapageia, 45, 149, 150, 151, 152 galeottii, 65 geissei, 78 gilliesii, 91 gilva, 163 gilvescens, 149 gilvoalba, 165, 166 glaberrima, 178 glauca, 178 glaucescens, 200, 201 glaucophylla, 214 glaucophylla laevior, 214 glomerata, 87, 89, 90, 94, 96 glomerata albispina, 90 glomerata flavispina, 90 glomerata minor, 90 golziana, 26 gomei, 165, 166 gorda, 191, 192 gosseliniana, 140, 141, I51 gracilis, 47 gracilis subpatens, 48 grahamii, 79, 83, 84 grandiflora, 126, 127, 129 grandis, 200, 201 grata, 92, 94, 95 greenei, 131 gregoriana, 147, 148 griffithsiana, 165 grosseiana, 107, II0 - guanicana, 208 guatemalensis, 110, 113, 218, 219 guerrana, I91, 192 guilanchi, 173, 174 gymnocarpa, 180 haematocarpa, 166 haitiensis, 206 hanburyana, 149, 153, 154 hattoniana, 103 helleri, 150, 152 hempeliana, 86, 87 hernandezii, 181 heteromorpha, 79 INDEX. Opuntia—continued. hevernickii, 214 hickenii, 90, 92, 93 hieronymi, 211 hitchenii, 214 hochderfferi, 198 horizontalis, 37, 90 horrida, 162 humifusa, 127, 128, 132 humifusa cymochila, 128 humifusa greenei, 128 humifusa macrorhiza, 128 humifusa microsperma, 127 humifusa oplocarpa, 128 humifusa parva, 127 humifusa stenochila, 128 humifusa vaseyi, 146 humilis, 113, 114 humistrata, 120 hypsophila, 71, .72 hyptiacantha, 176, 181, 183, 184 hystricina, 193, 197 hystrix, 65, 66 icterica, 173 ignescens, 90, 98 ignota, 90, 99 imbricata, 48, 55, 60, 63, 64, 65, 66 imbricata crassior, 63 imbricata ramosior, 64 imbricata tenuior, 64 inaequalis, 128 inaequilateralis, 181, 187, 188, 189 inamoena, 121, 125 incarnadilla, 185, 186 inermis, 161, 162, 163 insularis, 150, 152 intermedia, 127, 128 intermedia prostrata, 128 intricata, 119 invicta, 79 involuta, 87 irrorata, 116, 117 italica, 214 ithypetala, 190 jamaicensis, 110, 113 joconostle, 214 juniperina, 193, 197 jussieuii, 214 karwinskiana, 38 keyensis, 159, 162, 163, 222, 223 kiska-loro, 107, 108 kleiniae, 47, 51, 64, 65 kleiniae cristata, 51 kleiniae laetevirens, 51 kunzei, 80 labouretiana, 180, 189 labouretiana macrocarpa, 181 laevis, 159, 161, 168 lagopus, 86, 87, 88 lanceolata, 177, 179, 203 lanigeta, 176 larreyi, 191 lasiacantha, 181, 182, 183, 184 lata, 126, 220 laxiflora, 165 ledienii, 153 lemaireana, 156 leonina, 96 231 232 THE CACTACEAE. Opuntia—continued. leptarthra, 101 leptocarpa, 166, 167 leptocaulis, 47, 48, 49, 73, 213 leptocaulis brevispina, 47 leptocaulis laetevirens, 48 leptocaulis longispina, 47 leptocaulis major, 48 leptocaulis stipata, 47 leptocaulis vaginata, 47 leucacantha, 174, 175 leucacantha laevior, 175 leucacantha subferox, 175 leucantha, 175 leucophaea, 96 leucostata, 214 leucosticta, 174 leucotricha, 151, 1'74, 175 leucotricha fulvispina, 174 ligustica, 128 lindheimeri, 44, 148, 160, 164, 165, 166 lindheimeri cyclodes, 147 lindheimeri dulcis, 165 lindheimeri littoralis, 165 lindheimeri occidentalis, 146 linguiformis, 160, 163 littoralis, 147, 160, 164, 165 lloydii, 60, 63 longiclada, 161 longiglochia, 214 longispina, 95 lubrica, 118, 119 lucayana, 106, 163 lucens, 149 lucida, 214 lurida, 173 macateei, 126, 133, 220, 221 macdougaliana, 169, 170, 171 mackensenii, 137, 138, 139 macracantha, 187, 202, 203, 204, 205 macrarthra, 126, 129 macrocalyx, 118, 122 macrocentra, 140, 141, 176 macrophylla, 214 macrorhiza, 126, 127, 128, 130, 131, 139, 166 maculacantha, 134 maelenii, 134 magenta, 142, 146 magna, 64 magnarenensis, 147 magnifolia, 34 maihuen, 41 maldonadensis, 75 mamillata, 67, 68 maritima, 162 maxillare, 77 . maxima, 177, 180, 181 media, 199, 200 mediterranea, 128 megacantha, 178, 181, 182, 185, 186 megacantha lasiacantha, 182 megacantha tenuispina, 184 megacantha trichacantha, 186 megacarpa, 145 megalantha, 169 megalarthra, 192 megarhiza, 137 mendocienses, 65 Opuntia—continued. mesacantha, 127, 132 mesacantha cymochila, 131 mesacantha grandiflora, 129 mesacantha greenei, 131 mesacantha macrorhiza, 130 mesacantha microsperma, 127 mesacantha oplocarpa, 131, 144 mesacantha parva, 127, 128 mesacantha sphaerocarpa, 144 mesacantha stenochila, 132 mesacantha-vaseyi, 146 metternichii, 176 mexicana, 34 micrarthra, 171 microcarpa, 144, 206 microdasys, 118, 120, 121, 122, 123, 136 microdasys laevior, 120 microdasys minor, 120 microdasys rufida, 122 microdisca, 133, 135, 136 microthele, 73 mieckleyi, 156, 158 militaris, 102, 104, 163 millspaughii, 202, 204, 206 minima americana, 102 minor, 139 minor caulescens, 102 miquelii, 78 missouriensis, 199, 200 missouriensis albispina, 199, 200 missouriensis elongata, 214 missouriensis erythrostemma, 214 missouriensis microsperma, 199, 200 missouriensis platycarpa, 199, 200 missouriensis rufispina, 199, 200 missouriensis salmonea, 214 missouriensis subinermis, 199 missouriensis trichophora, 195 modesta, 67 mojavensis, 140, 145 molesta, 54, 60, 62, 66, 67 monacantha, 127, 156, 157 monacantha deflexa, 156 monacantha gracilior, 156, 157 monacantha variegata, 157 moniliformis, 33, 202, 206, 207, 208 montana, 214 montevidensis, 107, 109 monticola, 95 morenoi, 214 morisii, 128 mortolensis, 47 multiflora, 113, 114 myriacantha, 150, 152, 214 nana, 127, 217 nashii, 106, 163, 202, 203 nelsonii, 172 nemoralis, 102, 104 neoarbuscula, 50 nigricans, 152, 153 nigrispina, 90, 97 nigrita, 183, 184 nopalilla, 38 oblongata, 173 occidentalis, 140, 146, 147, 153, 163, 165 oligacantha, 89, 182 oplocarpa, 132 Opuntia—continued. opuntia, 43, 126, 127, 128, 217 orbiculata, 1'76 orbiculata metternichii, 176 ottonis, 214, 215 ovallei, 95, 214 ovata, 90, 95, 96 Ovoides, 95 pachona, 184 pachyarthra flava, 214 pachyclada rosea, 214 pachyclada spaethiana, 214 pachypus, 75, 77 pallida, 60, 65, 66 palmadora, 202 palmeri, 161 pampeana, 134 papyracantha, 89, 90 paraguayensis, 158 parishii, 57, 79, 81, 82 parkeri, 58 parmentieri, 95 parote, 214 parryi, 56, 57, 58, 81 parva, 161 parvispina, 117 parvula, 178 pascoensis, 100, IOI : patagonica, 41 | pelaguensis, 90 ) penicilligera, 135 : pennellii, 110, 115, 219 pentlandii, 71, 72, 77, 90, 97, 98 perrita, 65, 66 pes-corvi, 104 pestifer, 102, 103, 217, 218, 220 phaeacantha, 139, 140, 142, 144 phaeacantha brunnea, 144 phaeacantha major, 144 phaeacantha nigricans, 144 philippii, 41 phyllacantha, 96 phyllanthus, 215 piccolomini, 214 piccolominiana, 191 pilifera, 176, 177, 184 pintadera, 176 pititache, 29 pittieri, 181, 188, 189 platyacantha, 33, 89 platyacantha deflexispina, 89, 90 platyacantha gracilior, 89 platyacantha monvillei, 89 platyclada, 214 platynoda, 109 plumbea, 126, 131 plumosa nivea, 89, 90 poeppigii, 40, 41 pollardii, 126, 221 polyacantha, 193, 195, 196, 197, 199, 200 polyacantha albispina, 199 polyacantha borealis, 199 polyacantha microsperma, 200 polyacantha rufispina, 200 polyacantha trichophora, 195 polyacantha platycarpa, 199 polyacantha watsonii, 199 polyantha, 113, 114, 115 INDEX. Opuntia—continued. polymorpha, 89 porteri, 28 pottsii, 137, 138 praecox, 214 prate, 191 procumbens, 160, 167 prolifera, 61, 67, 69, 70 prostrata, 128 prostrata spinosior, 214 protracta, 214 protracta elongata, 214 pruinosa, 191 pseudococcinellifer, 153 pseudotuna, 184, 214 pseudotuna elongata, 214 pseudotuna spinosior, 214 puberula, 116, 117, 121,122 pubescens, 100, IOI, 173 pulchella, 79, 82 pulverata, 214 pulverulenta, 78 pulverulenta miquelii, 78 pulvinata, 120 pumila, 100, 101 purpurea, 97 pusilla, 102, 105, 106 pycnantha, 118, 123 pycnantha margaritana, 123 pyriformis, 160, 168 pyrocarpa, 166 pyrrhacantha, 97 quimilo, 181, 190, 191 quipa, 125 quitensis, 149, 154, 224 rafinesquei, 127, 128, 129 rafinesquei arkansana, 127, 129 rafinesquei cymochila, 131 rafinesquei cymochila montana, 131 rafinesquei fusiformis, 130 rafinesquei grandiflora, 129 rafinesquei greenei, 132 rafinesquei macrorhiza, 131 rafinesquei microsperma, 127, 199 rafinesquei minor, 127, 128 rafinesquei parva, 128 rafinesquei stenochila, 132 rafinesquei vaseyi, 146 rafinesquiana, 127, 129 rafinesquiana arkansana, 129 rahmeri, 94 ramosissima, 46, 48, 52 ramulifera, 47 rastrera, 140, 149 rauppiana, 90, 92 recedens, 128 recondita, 52; 53 recurvospina, 144 \ reflexa, 165 repens, 102, 103, 104, 115, 116 reptans, 214 _ retrorsa, 107, 109, 218 retrospinosa, 95 rhodantha, 193, 197, 198 rhodantha brevispina, 198 rhodantha flavispina, 198 rhodantha pisciformis, 198 rhodantha schumanniana, 198 233 234 Opuntia—continued. riparia, 149 robusta, 182, I9I, 192 robusta viridior, 191 rosea, 17, 63, 65, 78 roseana, 130 rosiflora, 78 rotundifolia, 27 roxburghiana, 156 rubescens, 163, 202, 208, 209 rubiflora, 133, 146 rubrifolia, 144 rufescens, 175 rufida, 118, 119, 122 rugosa, 145 russellii, 90, 94 ruthei, 64 rutila, 196 sabinii, 194 sacharosa, 14, salicornioides, 215 salmiana, 73 74 salmii, 214 sanguinocula, 131 santa-rita, 140, 142 scheeri, 159, 176 schickendantzii, 74, 107 schomburgkii, 214 schottii, 79, 80, 81 schottii greggii, 80 schumannii, 90, 149, 155 schweriniana, 199, 200 segethii, 75, 76, 79 seguina, 130 semispinosa, 147 senilis, 86, 159, 176 sericea, 134 sericea coerulea, 134 sericea longispina, 134. sericea maelenii, 134 serpentina, 56, 57, 58, 69, 81 setispina, 45, 137, 138 shaferi, 71, '72 shreveana, 142 sinclairii, 165, 166 skottsbergii, 90, 96, 97 soederstromiana, 149, 154, 221 soehrensii, 133, 134, 135 spathulata, 28, 29 spathulata aquosa, 30 speciosa, 214 spegazzinii, 73, 74 sphaerica, 90,96 — sphaerocarpa, 193, 198, 199 sphaerocarpa utahensis, 199 spinalba, 130 spinaurea, 214 spiniflora, 215 spinosior, 52, 67, 68 spinosior neomexicana, 68 spinosissima, 103, 175, 202, 204, 205 spinotecta, 64 spinulifera, 178, 181, 182 spinuliflora, 214 spinulosa, 214 splendens, 199 squarrosa, 165 stanlyi, 79, 80 THE CACTACEAE. Opuntia—continued. stapelia, 66 stapeliae, 65, 66 stellata, 64 stenarthra, 158 stenochila, 126, 132 stenopetala, 200, 201 straminea, 214 streptacantha, 181, 184, 185 stricta, 159, 161, 178, 223 stricta spinulescens, 214 strigil, 136 subarmata, 165, 166 subferox, 175 subinermis, 214 subterranea, 90, 92 subulata, 71, 75, 76, 77, 79 sulphurea, 133, 134, 150 sulphurea laevior, 134 sulphurea major, 134 sulphurea minor, 134 sulphurea pallidior, 134 superbospina, 144 syringacantha, 89 tapona, 124, 160, 164 tarapacana, 90, 94 tardospina, 140, 141 taylori, 102, 103 tenajo, 49 tenuispina, 137, 139 teres, 71 tesajo, 47, 48, 49 tessellata, 46 tessellata cristata, 46 testudinis-crus, 206 tetracantha, 52, 53, 54 texana, 165, 166 thurberi, 52, 53, 54 tidballii, 160 tomentella, 173, 174 tomentosa, 173, 174 tortisperma, 131, 132 tortispina, 126, 128, 131, 194 toumeyi, 144 tracyi, 102, 105 treleasei, 118, 119 treleasei kernii, 119 triacantha, 110, 112, 113, 115, 204 tribuloides, 186 tricolor, 165, 166 trichophora, 193, 195 tuberculata, 214 tuberiformis, 92 tuberosa, 32, 33 tuberosa spinosa, 89 tuna, 110, 113, 114, 116, 149, 157, 163 tuna humilis, 114 tuna laevior, 114 tuna orbiculata, 114 tunicata, 60, 65, 66, 83, 121 tunicata laevior, 66 tunoidea, 116, 162 tunoides, 116 turpinii, 89 turpinii polymorpha, 89 tweediei, 134 umbrella, 156 undosa, 177, 179 Opuntia—continued. undulata, 65, 177, 179 ursina, 174, 195, 196, 197 urumbella, 157 utahensis, 198 utkilio, 107, 109, 110 vaginata, 47, 48 valida, 147 vaseyi, 140, 142, 145, 146 velutina, 169, 172 verschaffeltii, 44, 71, 72 verschaffeltii digitalis, 71, 72 versicolor, 44, 52, 54, 60, 62 vestita, 71, 72, 87 vexans, 64, 65 vilis, 79, 82, 83 violacea, 144 virgata, 47 viridiflora, 52, 55 vivipara, 52 vulgaris, 127, 128, 156, 157, 163, 177 vulgaris balearica, 161 vulgaris major, 127 vulgaris media, 127 vulgaris minor, 127 vulgaris nana, 127, 129 vulgaris rafinesquei, 127 vulgo, 157 vulpina, 134 wagneri, 74 weberi, 84, 85 wentiana, 110, 116 whipplei, 31, 43, 52, 55, 68 whipplei laevior, 55 whipplei spinosior, 68 wilcoxii, 169, 172 winteriana, 166 wootonii, 147, 148 wrightii, 51 xanthoglochia, 130, 131 xanthostemma, 198 xanthostemma elegans, 198 xanthostemma fulgens, 198 xanthostemma gracilis, 198 xanthostemma orbicularis, 198 xanthostemma rosea, 198 xerocarpa, 198 youngii, 130 zebrina, 149, 155, 222 zacuapanensis, 183 zuniensis, 144 Opuntiacei, 217 Opuntieae, 8, 24 Orbiculatae, 45, 176 Palmadora, 202 Palmadorae, 45, 201 Palmatoria, 202 Pataquisca, 76 Peirescia, 9 Peireskia, 9 Pentlandianae, 44, 90 Perescia, 9 Pereskia, 8-24, 25, 26, 40, 75 acardia, 10 aculeata, 10, II, 14 aculeata lanceolata, 10 aculeata latifolia, 10 aculeata longispina, 10 INDEX. Pereskia—continued. aculeata rotunda, 10 aculeata rotundifolia, 10 aculeata rubescens, 10 affinis, 24 amapola, 14 argentina, 14 autumnalis, 9, II, 12 bahiensis, 9, 19, 20 bleo, 4, 9, 17, 18, 20 brasiliensis, 10 calandriniaefolia, 29 colombiana, 9, 17 conzattii, 9, 24 crassicaulis, 29 cruenta, 24 cubensis, 9, 22 foetens, 10 fragrans, 10 glomerata, 94 godseffiana, 10, 11 grandiflora, 24 grandifolia, 9, 18, 19, 20, 21 grandispina, 24 guamacho, 9, 15, 16 haageana, 24 horrida, 9, 21 lanceolata, 10 longispina, 10 lychnidiflora, 9, 12, 13 moorel, 9, 15 nicoyana, 9, 13 ochnacarpa, 19 opuntiaeflora, 26, 27 panamensis, 17, 18 pereskia, 7, 9, 10 | philippii, 41 | pititache, 29 plantaginea, 24 poeppigii, 41 portulacifolia, 9, 22, 23, 24 rosea, 17 rotundifolia, 27 sacharosa, 9, 10, 14, 15 spathulata, 28, 29 subulata, 75, 76 tampicana, 9, 17 undulata, 10 weberiana, 9, 15 zehntneri, 9, 13, 14 zinniaeflora, 9, 17, 20, 21 Pereskieae, 8, 24 Pereskiopsis, 8, 14, 17, 24, 25-39, 43 aquosa, 25, 29 autumnalis, 11, 12 brandegeei, 28 chapistle, 25, 27 diguetii, 25, 26, 27 kellermanii, 25, 30 opuntiaeflora, 25, 26, 27 pititache, 25, 29 porteri, 25, 28 rotundifolia, 25, 27, 28 spathulata, 25, 28 velutina, 25, 26 Pereskiopuntia, 25 Pest pear, 161, 163 | Phaeacanthae, 45, 136, 139, 141, 148 235 236 THE CACTACEAE. Pin pillow, 102 Platyopuntia, 45, 73, 84, 92, 99, 100, 135, 211 Polar bear cactus, 87 Polyacanthae, 45, 193 Portulaca, 9 Prickly pear, 43, 212 Pterocactus, 24, 30-33 decipiens, 32, 33 fischeri, 31 hickenii, 31 kuntzei, 30, 32, 33 kurtzei, 32 pumilus, 31, 32 tuberosus, 31, 32, 33 valentinii, 88 Pubescentes, 141 Puipute, 13 Pumilae, 45, 100 Quiabento, 14 Quimilo, 190 Quipa, 125 Ramosissimae, 44, 46 Rhipsalis, 8 _ Robustae, 45, 191 Sacacil, 214 Sacharosa, 10, 14 Salmianae, 44, 73, 75 Scheerianae, 45. 159 Sempervivum tomentosum, 41 Setispinae, 45, 136 Spear-shaped opuntia, 179 Spinosissimae, 43, 45, 201, 202, 203, 208 Stenopetalae, 45, 200 Stenopuntia, 200 Streptacanthae, 45, 112, 156, 177, 181, 192, 225 Strigiles, 45, 136 Subulatae, 44, 71, 75 Sucker, 43, 103 Sulphureae, 45, 133, 135 Tacinga, 24, 39, 40 funalis, 38, 39 Tapuna pear, 192 Tasajillo, 26, 30 Tasajo, 43 macho, 63 Tephrocactus, 42, 43, 44, 71, 72, 79, 84, 85, 90, 95, 97, 106, 135 andicolus, 89 aoracanthus, 91 calvus, 89 diadematus, 43, 89 platyacanthus, 89 ‘pusillus, 106 retrospinosus, 95 turpinii, 89 Teretes, 71 Thurberianae, 44, 52 Tomentosae, 45, 172 Tortispinae, 45, 104, 126, 130, 133, 136, 193 Tuna, 35, 43, 114, 181, 186 Tuna cardona, 184 Tuna elatior, 153 Tuna de agua, 30 Tuna de Espana, 224 Tuna major, 163 Tunae, 45, 110, 116, 148 Vestitae, 44, 71 Weberianae, 44, 84 West Indian gooseberry, 10 Wilcoxia, 6 . ? Zamia pumila, 181 Zygocactus, 9