BIOLOGY 1 9 The person charging this material is re- sponsible for its return to the library from which it was withdrawn on or before the Latest Date stamped below. Theft, mutilation, and underlining of books are reasons for disciplinary action and may result in dismissal from the University. To renew call Telephone Center, 333-84OO UNIVERSITY OF ILLINOIS LIBRARY AT URBANA-CHAMPAIGN L161— O-1096 M FIELDIANA: BOTANY A Continuation of the BOTANICAL SERIES of FIELD MUSEUM OF NATURAL HISTORY VOLUME 31 The Library of the JAN 1 8 1979 FIELD MUSEUM OF NATURAL HISTORY CHICAGO, U. S. A. £20.5 TABLE OF CONTENTS PAGE 1. Two New Species of Palms from Nicaragua. By S. F. Glassman ... 1 2. Tropical American Plants, VI. By Louis 0. Williams 11 3. Agriculture, Tehuacan Valley. By C. Earle Smith, Jr 49 4. Flora, Tehuacan Valley. By C. Earle Smith, Jr 101 5. Preliminary Studies in the Palm Genus Syagrus Mart, and Its Allies. By S. F. Glassman 145 6. Tropical American Plants, VII. By Louis 0. Williams 165 7. Supplement to Orchids of Guatemala. By Donovan S. Correll .... 175 8. Preliminary Notes on Scrophulariaceae of Peru. By Gabriel Edwin . . 223 9. New Species in the Palm Genus Syagrus Mart. By S. F. Glassman . . 233 10. Tropical American Plants, VIII. By Louis O. Williams 247 11. Notes on the Flora of Costa Rica, I. By William C. Burger 273 12. A New Eurystyles from Nicaragua. By Alfonso H. Heller 279 13. New Species in the Palm Genus Syagrus Mart. By S. F. Glassman . . 285 14. A Revision of the Family Geastraceae. By Patricio Ponce de Leon . . 303 15. Studies in American Plants. By Dorothy N. Gibson 353 16. Two New Nicaraguan Juglandaceae. By Antonio Molino R 357 17. Studies in the Palm Genus Syagrus Mart. By S. F. Glassman .... 363 18. Tropical American Plants, IX. By Louis O. Williams 401 -31 STUDIES IN AMERICAN PLANTS DOROTHY N. GIBSON TWO NEW NICARAGUAN JUGLANDACEAE ANTONIO MOLINA R. STUDIES IN THE PALM GENUS SYAGRUS MART. S. F. GLASSMAN TROPICAL AMERICAN PLANTS, IX LOUIS 0. WILLIAMS FIELDIANA: BOTANY VOLUME 31 NUMBERS 15, 16, 17, 18 Published by FIELD MUSEUM OF NATURAL HISTORY MAY 23, 1968 Imcratf if Rfinfe JUL1H968 LAI n ii«**> TWO NEW NICARAGUAN JUGLANDACEAE ANTONIO MOLINA R. Field Associate FIELDIANA: BOTANY VOLUME 31, NUMBER 16 Published by FIELD MUSEUM OF NATURAL HISTORY MAY 23, 1968 PUBLICATION 1046 Library of Congress Catalog Card Number: 68-26378 PRINTED IN THE UNITED STATES OF AMERICA BY FIELD MUSEUM PRESS Two New Nicaraguan Juglandaceae ANTONIO MOLINA R. In our continuing explorations and botanical investigations in Nicaragua which we are able to carry on with assistance from the National Science Foundation, we have collected thousands of num- bers of plant specimens which increase the usefulness of the herbaria in Zamorano and in Chicago, as well as herbaria which receive dupli- cates in exchange. There have been recognized a considerable num- ber of undescribed plants in these collections, as was to be expected, for Nicaragua is the least known biologically of the Central American countries. We have seen two trees of the Juglandaceae in the Cordillera Central de Nicaragua which we did not recognize, one an Engel- hardtia the other an Alfaroa. We have accumulated adequate ma- terials of both of these trees and both appear to be new. Alfaroa williamsii A. Molina, sp. nov. Arbor valida usque ad 25 m. et 0.5 m. diam. Folia subopposita vel alterna composita, foliola 3-5 paribus anguste elliptica vel elliptico-oblanceolata acuta vel acuminata coriacea basi cuneata; inflorescentia masculina paniculata erecta multiflora; inflorescentia foem. spica pauciflora; flores masc. tepala 2 oblonga vel obovata; flores foem. tepala 4 oblanceolata vel spathulata; fructus rotundatus vel obovoideus. Trees 15-25 m. tall, the trunks 0.3-0.5 m. in diameter, the bark smooth or becoming rugose, easily separated from the trunk in short, thin sheets, greenish- yellow or pale cream colored. Branches cylindrical, glabrous, commonly striated or verrucose and with many brownish elliptical or rounded lenticels; leaves sub- opposite or alternate, compound, mostly 15-25 cm. long, the leaflets 3-5 alternate or subopposite pairs, coriaceous, narrowly elliptic or elliptic-oblanceolate, acute or acuminate, obliquely cuneate to the base, with 14-20 pairs of secondary nerves, glabrous except obscurely lepidote below, 4-13.5 cm. long and 1.5-3.5 cm. broad, petioles 1.4-4.5 cm. long, rachis canaliculate, 3-13 cm. long, petiolules short, 1-2 mm. long; staminate inflorescence terminal or axillary-terminal, panicles of several erect many-flowered catkins; pistillate inflorescence a terminal or subaxil- lary few-flowered spike; staminate flowers many, sessile, lepidote-glandular, bract trilobate, 3-4 mm. long, lateral lobes 0.5 mm. long, the central lobe 1 mm. long, obtuse or acute, tepals 2, oblong or obovate, about 1 mm. long, stamens 7-9, anthers two, sessile, oblong, 1-1.5 mm. long and about 1 mm. broad; pistillate 357 358 FIELDIANA: BOTANY, VOLUME 31 flowers sessile, 5-7 mm. long, the tepals 4, thick and fleshy, glabrous or usually lepidote, oblanceolate or spathulate, 2-4 mm. long and 0.5-1.5 mm. broad, stigma bifid, about 1-1.5 mm. long, the style about 2 mm. long, ovary 2 mm. long, sub- tended by a trilobate bract 1-2 mm. long and with lobes 0.5-2 mm. long; fruit a sessile, woody, hard, glabrous, 8-10 celled with as many as 13 septae, drupaceous nut, rounded or shortly obovoid, 14-17 mm. long and 13-16 mm. in diameter, with 8-9 raised ribs, the tepals and style persistent at the apex. NICARAGUA: tree 15-20 m. tall, in old cut-over cloud forest area between Disparate de Potter and Aranjuez, Cordillera Central de Nicaragua, Dept. Matagalpa, alt. 1,300 meters, Jan. 12, 1963, Wil- liams, Molina and Williams 23717 (type, F; EAP) ; tree to 15 meters, wide spreading, cut-over cloud forest area, Cordillera Central de Nicaragua, road to Aranjuez, Dept. Jinotega, alt. 1,400 meters, Jan. 8, 1967, Williams and Molina 20143; "Areno bianco," tree 20- 25 meters tall, 30-50 cm. in diameter, cut-over cloud forest area, El Arenal, between Aranjuez and Santa Martha, Dept. Matagalpa, alt. 1,400 meters, March 7, 1967, Molina 203 40. There have been three species of Alfaroa previously described from Central America from which A. williamsii is easily distinguished by its small nearly round, glabrous and ribbed fruits. It is at the same time the third member of the Juglandaceae to be found in Nicaragua within recent years where none was previously known,— Juglans olanchana Standl. & L. Wms. and the two species described in this paper. It is a pleasure to name this distinctive Nicaraguan tree for my friend and field companion of many years, Louis O. Williams, who has spent his life working with the flora of Central America. Engelhardtia nicaraguensis A. Molina, sp. nov. Arbor valida usque ad 25 m. vel ultra. Folia pinnata, usque ad 12 cm. longa; foliola 4-6 pares, lamina coriacea, lanceolata, lanceolato-oblonga vel anguste oblonga, acuminata vel acuta, basi uni- vel biauriculata; fructa obovata bractea trilobata in racima elongata. Large forest trees, 10-25 m. tall, the trunk cylindrical, 25-50 cm. in diameter or perhaps more, bark yellowish or grayish-green; leaves pinnate, opposite, the petioles 2.5-3.5 cm. long, glabrous or minutely lepidote, the rachis subterete or obscurely canaliculate, 4-9 cm. long, slender; leaflets 4-6 pairs, opposite or sub- opposite, short petiolulate, coriaceous, lanceolate, lanceolate-oblong to narrowly oblong, 3-8.5 cm. long and 1.5-2.3 cm. broad, sometimes with slightly revolute margins (in dry specimens), glabrous or lightly punctate-lepidote, somewhat glaucous below, acuminate or acute, the base obtuse or more commonly attenuate and oblique with a very small revolute auricle or usually biauriculate; central vein prominent on both surfaces of the leaflet, secondary veins several to many MOLINA: NEW NICARAGUAN JUGLANDACEAE 359 and less prominent; the lepidote petiolules 1-2 mm. long; female inflorescence cymosely branched (one seen), about 15 cm. long, each branch with 5 or perhaps more short pedunculate flowers; nuts obovoid or ovoid, 6-8 mm. long and 6-7 mm. in diameter, subtended by a rigidly membranaceous, reticulately nerved, lepidote trilobate bract, central lobe of bract oblong-linear or spathulate, about 2-3.8 cm. long and 0.6-0.8 cm. broad, emarginate, the lateral lobes narrowly oblong, obtuse, about 1.5 cm. long and 0.5-0.8 cm. broad, fruiting peduncles 0.2-0.5 cm. long. NICARAGUA: Arbol 25 m., tallo 25-50 cm. diametro, bosque nebuloso vecindades de Santa Maria de Ostuma, departamento de Matagalpa, alt. 1,300 m., Mayo 1957, Juan B. Sales 2967 (F, type; EAP) ; arbol 10-15 m. en bosque humedo cerca Aranjuez, departa- mento de Jinotega, alt. 1,160 m., Agosto 1957, Juan B. Sales y B. J. Taylor 2967a. The lack of really good herbarium material makes it difficult to establish clearly the relationship of this species, although it must be closest to Engelhardtia mexicana Standl. The Mexican species has leaves with 3-4 pairs of leaflets and a petiole 1.5-2 cm. long and the rachis 2-6 cm. long, the petiolules of the leaflets 2-3 mm. long; the leaflets in that are linear-lanceolate, 5-8.5 cm. long, with the apex long attenuate, entire or sometimes with tooth-like undulations near the apex, the auricles at the base obtusely deltoid or rounded ; the lobes of the bracts are oblong or linear-oblong; the nut broadly obovoid and 6-7 mm. long. Publications 1045, 1046, 1047, and 1048 UNIVERSITY OF ILLINOIS-URBANA