116 GRAMINEAE. 
9. Panicum longifélium Torr. Long-leaved Panicum. (Fig. 251.) 
Panicum longifolium Torr, Fl. U.S. 149. 1824. 
Culms erect, 1°-2° tall, slender, simple, or occa- 
sionally with a single lateral panicle, flattened, 
smooth and glabrous. Sheaths smooth and glab- 
rous; leaves 8/-12’ long, 1//-2’’ wide, acuminate 
into a long, slender point, rough, glabrous ; 
ligule short, pilose; panicles 5’—9’ long; primary 
branches long and slender, spreading, secondary 
very short, appressed, generally bearing 1-3 spike- 
lets; spikelets 1’ long, acuminate; first scale acute 
about one-half as long as the acuminate second 
one; third scale equalling the second, acuminate, 
one-third longer than the elliptic obtuse fourth one. 
‘This seems to be a well-marked species. Its slender 
simple very much flattened culms, the long and nar- 
row leaves, and the long slender branches of the pan- 
icle bearing the spikelets almost racemosely, abund- 
antly distinguish it from any others of this group. 
Moist soil, New Jersey and Pennsylvania. Aug.—Sept. 
10. Panicum sphaerocarpon Ell. Round-fruited Panicum. (Fig. 252.) 
Panicum sphaerocarpon Ell. Bot. S. C. & Ga. I: 125. 
1817. 
Culms generally erect, simple or somewhat 
branched at base, 10’—2° tall, smooth, or the nodes 
sometimes pubescent. Sheaths usually shorter - 
than the internodes, glabrous, the margins ciliate ; 
leaves 2/-4’ long, 2’’-7’’ wide, acuminate, cordate- 
clasping at base, scabrous above, smooth beneath, 
the margins cartilaginous and minutely serrulate, 
ciliate towards the base; panicle ovoid, 2/4’ long; 
spikelets less than 1/’ long, nearly spherical or 
somewhat longer than thick, obtuse, purple; 
first scale broadly ovate, obtuse; third and fourth 
scales three to four times as long as the first, subor- 
bicular, 7-nerved; fourth scale oval, obtuse, 3// 
long; palet of third scale usually empty. 
Dry soil, southern Ontario, New York and Mis- 
souri, to Florida, Texas and Mexico. July—Sept. 
11. Panicum microcarpon Muhl. Small-fruited Panicum. (Fig. 253.) 
Panicum microcarpon Muh. Gram. 111. 1817. 
Culms generally erect, 2°—3° tall, simple, smooth. 
Sheaths smooth, glabrous, longer than the inter- 
nodes; ligule none; leaves 5/—8’ long, %4’-1’ wide, 
long-acuminate, smooth, cordate-clasping and spar- 
ingly ciliate at the base; panicle 3/-8’ long, ovoid 
to oblong in outline; branches slender, ascending ; 
spikelets 3{’/ long, obovoid to nearly spherical, 
numerous; first scale minute, second and third 
about equal, 7-nerved, puberulent, the fourth 
white and shining; palet of third scale usually 
empty. 
= Qt 
Woods and along thickets, southern New York to 
Pennsylvania and Michigan, south to Florida, Louisi- 2 
ana, Nebraska and Texas. July-Sept. * =) \ 
