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 Potosi to Tampico, Pal- 

 mer 1151 in 1879. 



Guatemala: Alta Vera Paz, Lewton 377, Tuerckheim 7798; Gualan, Beam 424; 

 Morales, Kellerman 6272. 



Honduras: San Pedro Sula, Thieme 5587 in part. 



Costa Rica: Talamanca, Tonduz 8600, 8670. 



Panama: Bocas del Toro, Hart 87. 



Cuba: Trinidad, Wright 753; Romelie, Eggers 5350; Vento, Curtiss 598, Leon 557. 



Jamaica: Purdie (Gray Herb.). 



Porto Rico: Cayey, Sintenis 2471. 



Colombia: Santa Marta, Smith 2151. 



Venezuela: Tovar, Fendler 1643. 



Brazil: Without locality, Burchell 7062, 8791, Riedel 1360. 



Paraguay: 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. u Hab. in 

 montanis Peruviae huanoccensibus ." The type specimen, labeled '"Panicum mega- 

 stachyum Presl. Peruana montano guanoccensis. Haenke," is in the herbarium of the 

 Bohemian Museum. 



Panicum urvilleanum Kunth, Rev. Gram. 2: 403. pi. 115. 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. a The type specimen, in the Berlin Herbarium, is 

 labeled "Conception de Chili, D'Urville ded 1815." 



Panicum preslei 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. S. 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 



a Op. cit. 1:35. 1829. 



