132 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
DISTRIBUTION. 
Thickets, river banks and rocky slopes, Mexico, the West Indies, and south to 
Paraguay. 
Mexico: Colima, Palmer 1257 in 1891; Colipa, Liebmann 432; Jicaltepec, Lieb- 
mann 320; Vera Cruz, Miiller 2172 in part; San Luis Potosf to Tampico, Pal- 
mer 1151 in 1879, . 
GuATEMALA: Alta Vera Paz, Lewton 377, Tuerckheim 7798; Gualan, Deam 424; 
Morales, Kellerman 6272. 
Honpuras;: San Pedro SulA, Thieme 5587 in part. 
Costa Rica: Talamanca, Tonduz 8600, 8670. 
PanaMA: Bocas del Toro, Hart 87. 
SuBA: Trinidad, Wright 753; Romelie, Eggers 5350; Vento, Curtiss 598, Leén 557. 
Jamaica: Purdie (Gray Herb.). 
Porto Rico: Cayey, Sintents 2471. 
‘OLOMBIA: Santa Marta, Smith 2151. 
VENEZUELA: Tovar, Fendler 1643. 
Brazit: Without locality, Burchell 7062, 8791, Riedel 1360. 
Paraauay: Morong 317, 1571. 
Urvilleana.—Perennials with large, densely villous spikelets, the fertile lemma 
clothed with long hairs on the margin. A South American group of two or 
three species, of which one extends into the desert region of the southwestern 
United States. 
75. Panicum urvilleanum Kunth. 
Panicum megastachyum Presl, Rel. Haenk. 1: 305. 1830, not Nees 1826. ‘‘ Hab. in 
montanis Peruviae huanoccensibus.’’ The type specimen, labeled ‘‘ Panicum mega- 
stachyum Pres]. Peruana montano guanoccensis. Haenke,’’ is in the herbarium of the 
Bohemian Museum. 
Panicum urvilleanum Kunth, Rév. Gram, 2: 403. pl. 175. 1830. Kunth gives no 
definite locality other than ‘‘Crescit in regno Chilensi.’’ The name is listed with the 
citation ‘‘Chili: Legit amiciss, Dumont D’Urville,’’? but without description, in an 
earlier part of the same work.t The type specimen, in the Berlin Herbarium, is 
labeled ‘‘Conception de Chili, D’Urville ded 1815.”’ 
Panicum preslet Kunth, Enum. Pl. 1: 121. 1833. Based on ‘*P. megastachyum 
Presl,’’ the name is presumably changed because of P. megastachyum Nees. Presl’s 
description is copied, Kunth evidently not having seen the plant. 
Panicum urvilleanum longiglumis{e] Scribn. U.S. Dept. Agr. Div. Agrost. Bull. 17: 
(ed. 2). 49.1901. ‘‘San Jacinto, Southern Calif. No. 887. 8. B. & W. F. Parish, 
June, 1882.’’ The type specimen, in the National Herbarium, has spikelets about 7 
mm. long. 
DESCRIPTION, 
Plants robust, erect from a creeping rootstock, 0.5 to 1 meter high, culms solitary or 
few in a tuft, simple or branching at the base only, the nodes densely bearded, rarely 
visible; sheaths overlapping, loose, densely, retrorsely, harshly villous; ligules densely 
ciliate, about 2 mm. long; blades 30 to 60 cm. long, 4 to 7 mm. wide, tapering from a 
flat base to a long involute-setaceous point, retrorsely strigose to nearly glabrous on 
both surfaces, panicles short-exserted, equaled or exceeded by the upper blades, 25 
to 30 cm. long, about half as wide, rather many-flowered, the glabrous to pilose, slender, 
flexuous branches ascending, producing spikelet-bearing branchlets along the upper 
half to two-thirds of their length; spikelets short-pediceled, 6 to 7 mm. long, about 2 
@ Op. cit. 1: 35. 1829. 
