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568 GRAMINEÆ. (GRASS FAMILY.) 
40. LOLIUM, L. DARNEL. 
Rigid flat-leaved (introduced) grasses, with spiked many-flowered compressed 
spikelets, with one edge applied to the jointless rachis. Glume 1, rigid, awnless. 
` Lower palea concave, awnless, or short-awned, herbaceous. Stamens 3. Grain 
adherent to the upper palea. — Spikelets distant on the elongated rachis. 
1. L. temulentum, L. Culm tall (2° high); rachis (1° long) flexuous; 
glume rigid, many-nerved, longer than the 5-flowered spikelet, lower palea awned 
under the scarious obtuse apex. — Grain-fields, North Carolina. (1) 
2. L. arvense, Withering. Culms low (6/—12/); rachis (6/-8' long) 
straight; glume rigid, many-nerved, shorter than the 8 —10-flowered spikelet ; 
lower palea awnless or short-awned at the scarious emarginate apex. — Streets 
of Apalachicola. July. @ 
4 AIBA, LL. 
Low and slender tufted grasses, with the small 2-flowered stalked spikelets in 
a loose panicle. Glumes membranaceous, keeled, longer than the flowers. Pa- 
lez hairy at the base; the lower one 3 - 5-nerved, and awned on the back. Sta- 
mens 3. Grain oblong, smooth. 
1. A. flexuosa, L. Culms nearly naked, 1°~14° high; leaves short, 
bristle-like ; panicle small, capillary, spreading ; lower palea toothed at the apex, 
much shorter than the slender awn; grain free. — Mountains of Georgia, and 
northward. July. Y. 
, 
42. TRISETUM, Pers. 
Spikelets 2 - several-flowered. Lower palea compressed-keeled, usually bear- 
ing a bent awn below the 2-cleft or 2-pointed apex. Otherwise as in Aira. 
Spikelets in open or spiked panicles, 
1. T. palustre, Torr. Smooth; culms weak (1°- 14° long) ; leaves flat, 
linear; panicle long and narrow, loose; spikelets 2-3-flowered; the lower 
flower awnless, the upper with 8 spreading awn and an awn-like radiment at the 
base, or rarely both flowers awnless. (Aira pallens, Muhl, A. trifora, Ell. m 
Swamps, West Florida to Mississippi, and northward. March and April.— 
Panicle pale, 4! - 8! long. 
2. T. molle, Kunth. Soft downy; culms short (6/- 8’); panicle w 
long) contracted, dense and spike-like; spikelets 2-flowered, the lower palea ¢ : 
both flowers with a spreading awn. — Mountains of North Carolina, and north- 
^49. DANTHONIA, DC... tT : 
s, with racemose or panicled spikelets, and rough or bearded — — 
