427 
15. Sporobolus Serotinus. Gray. 
Syn. —Agrostis serotina, Torr. Yilfa serotina, Tor. and Gray. V. 
ienera, Trin. 
Smooth ; culms very slender flattish, few-leaved, leaves very narrow 
channeled, keeled ; panicle soon much exserted, elongated, the diffuse 
capillary branches scattered, distant, alternate; pedicels capillary; glumes 
ovate, a little unequal, obtuse, about half the length of the oblong, ob¬ 
tuse paleae. Sandy swamps or wet places. Annual; flowers in Septem¬ 
ber ; culms 8 to 15 inches high. Michigan. 
16. Sporobolus Asper. Wood* 
Root long, white, fibrous ; culm stout, glabrous, geniculate at the base; 
leaves rigid glabrous, tapering to a long pungent point; branches with 
short leaves, barren, also ending in a long pungent point; sheaths ciliate 
at the edge and bearing dense tufts of long, white hairs at top ; panicles 
small, terminal and lateral, half inclosed in the long sheath ; spikelets 
blackish-green ; lower glume very short, upper nearly as long as the 
paleae ; grain compressed obovate. Perennial; culms 2 feet high. Ohio. 
Wm. S. Sullivant. 
GENUS 8. AGROSTIS. Linnceus. 
[From the Greek, agros a field, its place of growth.] 
Spikelets one-flowered, in an open panicle; glumes two, somewhat 
equal, or the lower rather longer, usually longer than the paleae, point¬ 
less ; paleae two, very thin, pointless, naked; the lower 3 to 5 nerved, 
and frequently awned on the back, the upper often minute or wanting; 
stamens usually three; grain free; culms cespitose, slender, panicle dif¬ 
fuse, the branches fasciculate-verticillate. 
17. Agrostis Vulgaris. Withering. 
Syn. —Agrostis polymorpha, Hudson. A. liispida, Willd. A. pumila, 
Linn. A. alba, Muhl., (not Linn.) Red top. Herd's Grassf of Penn¬ 
sylvania and States south of it. Bent grass of English writers. 
Panicle oblong, with spreading slightly rough short branches (purple); 
* Class book of Botany, p. 599. 
t This name is applied to the Phleum pratensc in N. York and the N. England States 
