HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 273 
797, 803, 804, 808, 819, Nash 15, 63 in part, 1837, 2076; Sumter County, Curtiss 
F, 3600A in part; Jensen, Hitchcock 733, 737, 750; Santa Rosa Island, Tracy 
6446, 6447; Perdido, Tracy 8406; Myers, Chase 4173, Hitchcock 889. 
ALABAMA: Fort Morgan, Tracy 8397. 
Mississippi: Biloxi, Kearney 3314; Mississippi City, Hitchcock 1113; Horn Island, 
Tracy 2863, 8412. 
Texas: Narcoossee, Ennis in 1899. 
Cusa: Without locality, Wright 3876. 
Porro Rico: Santurce, Heller 982b, 6442; Vega Baja, Heller 639, Underwood & 
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. (TRatTtTINIcK ex hbio Enslini).” Tri- 
nius had previously mentioned the name@ 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. 8. 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 to7 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. From 
type specimen. 
a Clay, Agrost. 234. 1922, 
41616°—voL 15—10——18 
