HITCHCOCK AND CHASE — NOETH AMERICAN PANICUM. 



273 



797, 803, 804, 808, 819, Nash 15, 63 in part, 1337, 2076; Sumter County, Curtiss 

 F, 3600A in part; Jensen, Hitchcock 733, 737, 750; Santa Rosa Island, Tracy 

 6446, 6447; Berdido, Tracy 8406; Myers, Chase 4173, Hitchcock 889. 



Alabama: Fort Morgan, Tracy 8397. 



Mississippi: Biloxi, Kearney 331^; Mississippi City, Hitchcock 1113; Horn Island, 

 Tracy 2863, 8412. 



Texas: Narcoossee, Ennis in 1899. 



Cuba: Without locality, Wright 3876. 



Porto Rico: Santurce, Heller 982b, 6442; Vega Baja, Heller 639, Underwood ds 

 Griggs 955. 



164. Panicum. lancearium Trin. 



Panicum lancearium Trin. Gram. Pan. 223. 1826. Trinius here gives a full descrip- 

 tion and states that his specimen was collected in North America by Enslin and com- 

 municated by Trattinick: "V. spp. Am. bor. (Trattinick ex hbio "Enslini). " Tri- 

 nius had previously mentioned the name a as a probable synonym of a Plukenet 

 species. The type, in the Trinius Herbarium, is the vernal form, with glabrous spike- 

 lets 2 mm. long. It is labeled "Plukn. Tb. 92. f. 6.? In Am. bor. ab Enslino 1. dt. 

 cl. Trattinick." 



Panicum nashianum Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 7 : 79./. 61. 1897. 

 Two specimens are cited, "4029 Curtiss (1893), and 466 Nash (1894). — Low pine bar- 

 rens, often in moist ground, near the coast, Virginia to Mississippi. " The type (Nash 

 466, since the species is named for the collector) is in the National Herbarium. It 

 consists of a clump of numerous culms 15 to 30 cm. high with mature and immature 

 panicles, the spikelets minutely pubescent. The accompanying label gives the fol- 

 lowing data: ' ' Dry sandy soil. Grows in dense clumps 1 ft. across. Collected in vicin- 

 ity of Eustis, Lake county, Florida, by Geo. V. Nash, April 15-30, 1894. " The Curtiss 

 specimen cited by Scribner has glabrous spikelets. 



DESCRIPTION. 



Vernal culms cespitose, usually purplish, wiry, stiffly ascending from a more or less 

 geniculate base, 20 to 50 cm. high, minutely grayish crisp-puberulent; sheaths puber- 

 ulent, at least near the margin, much shorter than the internodes; blades ascending or 

 spreading, firm, 2 to 6 cm. long, 3 to 7 mm. wide, puberulent or nearly glabrous beneath, 

 usually glabrous on the upper surface, strongly ciliate toward the base, or sometimes 

 nearly to the apex; panicles 3 to 6 cm. long, two-thirds as wide, rather few-flowered, the 



flexuous branches spreading, or the lower reflexed; 

 spikelets 2 to 2.1 mm. long, 1 to 1.2 mm. wide; first 

 glume one-third to half as long as the spikelet, obtuse 

 or truncate; second glume and sterile lemma puberu- 

 lent or sometimes glabrous, the glume slightly shorter 

 than the fruit and sterile lemma; fruit 1.6 to 1.7 mm. 

 long, 1 mm. wide, obovate-elliptic, minutely puberu- 

 lent at the apex. 



Autumnal culms geniculate-spreading, ascending 

 at the ends, the stiff internodes occasionally elon- 

 gated, branching from the middle nodes, the branches much longer than the inter- 

 nodes, late in the season bearing fascicles of short branchlets toward the summit, the 

 reduced flat or involute-pointed blades spreading, the ultimate panicles reduced to a 

 few spikelets, partly inclosed in the sheaths. 



Fig. 305.— P. lancearium. 

 type specimen. 



From 



41616°— vol 15—10- 



« Clav. Agrost. 234, 1822, 

 -18 



