OSMORHIZA GEOHINTONII (AP1ACEAE), A NEW SPECIES FROM NUEVO LEON, MEXICO Billie L. Turner Plant Resources Center The University of Texas Austin, TX 78712 ABSTRACT A new taxon, Ozmorhiza geohintonii B.L. Turner, sp. nov., is described from southern Nuevo Leon, Mexico. It is similar and apparently closely related to the widespread O. mexicana but is readily distinguished by a number of features including petal color, fruit shape and ornamentation, style length, and leaf glabrosity. A photograph of the type is provided, along with maps showing the distribution of the taxa concerned. KEY WORDS: Apiaceae, Osmorhiza, Mexico, Nuevo Leon Routine identification of Mexican plants has revealed the following novelty. OSMORHIZA GEOHINTONII B.L. Turner, sp. nov., Figs. 1, 2. Osmorhiza bipatriata Constance & Shan similis sed foliis glabris (vs. pubescentibus), petalis flavis (vs. albis), fructibus valde ornatis costis flavis elevatis (vs. laevibus nitidis sine costis elevatis), et ramis styli (stylopodio incluso) plerumque ca. 1.5 mm in longitudine (vs. 1 mm in longitudine vel brevioribus). TYPE: MEXICO. Nuevo Leon. Mpio. Zaragoza, Cerro El Viejo, 2050 m, scattered plants, 0.5m,7Jul2007,ffintonefa/.22;;6(holotype:TEX). Fig. 1. Perennial herbs, 40-50 cm high, glabrous. Leaves mostly basal, 10-15 cm long, 6-10 cm wide, bipinnately dissected, glabrous, the serrations acute at apices; petioles 4-8 cm long. Flowers 10-20, borne in terminal umbels, primary peduncles 8-16 cm long, secondary peduncles mostly 5, 3-5 cm long. Pedicels, glabrous, 2-3 mm long. Petals 5, obovate, ca 1 mm long, reportedly "yellow." Anthers, ca 0.5 mm long. Style branches (including stylopodium), ca 1.5 mm long, separate to base. Fruits linear to clavate, ca 1.5 cm long, 3-4 mm wide, not tapered at base (as in O. mexicana), espiculate, markedly ornate with raised yellow ribs, not at all glossy or shellacked (as in O. bipatriata). ADDITIONAL SPECIMEN EXAMINED: MEXICO. Nuevo Leon. [Mpio. Zaragoza], below San Josecito, 2485 m, oak woods, 40 cm, thin colony, fl yellow, 31 Jul 1999, Hinton et al. 27390 (TEX). Label data place this collection as from [Mpio.j "Aramberri," but the village of San Josecito is in Mpio. Zaragoza. George Hinton, after reading an advanced copy of this paper, confirmed my observations, but added this: "When my father and I went to Cerro Viejo 1 had no GPS so I had but a vague idea of where the collection was made. When 1 collected GBH 27390 I did have a GPS: 23° 55* 40" N, 99° 57* 49.3" W. It is very close to where I collected the types for Verhesina tamanuevana, Gibasis hintoniorum, and Satureja hintoniorum, and about 7.5 km. from the type of Acourtia hintoniorum. A good place to collect!" subsp, bipatriata (Constance & Shan) O. bipatriata Constance & Shan by James j species of Osmorhizi Henrickson in 2005. The distinctions between these taxa, including O. geohintonii and O. Griseb., are outlined in the following key. 1. Fruits tapering to the base, tlie bodies to some extent spiculate Osmorhiza mexicana 1. Fruits not tapering basally, spicules absent. 2. Petals white; styles (including stylopodium) 0.5-0.8 mm long; leaves to some extent pubescent Osmorhiza bipatriata 2. Petals yellow; styles (including stylopodium) ca 1.5 mm long; leaves glabrous Osmorhiza geohintonii Constance and Shan (1948) first recognized Osmorhiza bipatriata at specific rank, typified by material from the Davis Mountains in trans-Pecos Texas; the taxon was subsequently treated as O. mexicana subsp. bipatriata by Lowry and Jones (1985). Wen et al. (2004), drawing upon DNA data, accepted its specific status, noting its relationship to be closer to O. depauperata Phil, as first noted by Yoo et al. (2002), who observed that O. mexicana and O. bipatriata do not form a monophyletic group. Lowry and Jones (1985) cited four specimens of Osmorhiza subsp, bipatriat Nuevo Leon on Cerro Potosi at relatively high elevations, two of these (Mueller 2231 and Schneider 1108) thought to be "intermediate between O. mexicana subsp. mexicana and subsp. bipatriata" I take all of these Cerro Potosi collections to be specimens of O. mexicana, the specimens concerned bearing nearly espiculate fruits, although they otherwise fit well within the fabric of O. mexicana. Distribution of the taxa is shown in Fig. 2, based upon specimens at LL-TEX and those cited in the paper by Lowry and Jones (1985). ACKNOWLEDGEMENTS I wish to thank Guy Nesom for the Latin diagnosis and providing helpful suggestions on the paper itself. Especially noteworthy has been the assistance of my colleague, Robert Harms, for his expert help with my computer problems. LITERATURE CITED Constance, L. and R.H. Shan. 1948. The genus Ozmorhiza (Umbelliferae). a study in geographic affinities. Univ. Calif. Publ. Bot. 23: 11-156. Lowry, P.P. and AG. Jones. 1985. Svstematics of Ozmorhiza Raf (Apiaceae: Apioideae). Ann. Missouri Bot. Gard. 71: 1128-1171. Wen, J., P.P. Lowry II, and J.C. Zech. 2004. Ozmorhiza bipatriata (Apiaceae) in Texas: Taxonomie status and conservation considerations. Sida 21: 501-506. Yoo, K.-O., P.P. Lowrey II, and J. Wen. 2002. Discordance of chloroplast and nuclear ribosomal DNA data in Osmorhiza (Apiaceae). Amer. J. Bot. 89: 966-971. e 1. Osmorhiza geohintonii (holotype: TEX). OZMORHIZA • bipatriata O geohintonii • mexicana Figure 2. Distribution of tile Ozmorhiz