554 GRAMINEÆ®. (GRASS FAMILY.) 
palea 5-nerved, rough-keeled, about as long as the awn, much longer than the 
hairs at the base. — Swamps, North Carolina, and northward. Aug. and Sept. 
— Culms 29-3? high. Leaves somewhat glaucous. Panicle J? long, purplish. 
§ 2. AMMOPHILA. — Glumes and palece somewhat coriaceous: panicle spike-like. 
2. C. arenaria, Roth. Culms and elongated convolute leaves rigid; pan- 
icle long (5'-9'), cylindrical; lower palea 5-nerved, obscurely awned, 3 times 
as long as the hairs at the base. — Sandy sea-shore, North Carolina, and north- 
ward. Aug.—Rootstock creeping. Culm 29-39 high. Spikelets, like the 
whole plant, whitish, 4’ long. 
13. STIPA, L. Fearner-Grass. 
Perennial grasses, with convolute leaves, and loose panicles of 1-flowered 
spikelets, with very long awns. Glumes 2, membranaceous, nearly equal, awn- 
less and persistent. Pales coriaceous, inyolute, raised on an obconical bearded 
stalk, the lower one with a twisted or contorted awn jointed with its apex. Sta- 
mens 3. Grain terete, enclosed in the pales. 
1. S. avenacea, L. Culms (1°-2° high) clustered ; leaves narrowly linear, 
rough, the lowest elongated ; awn pubescent, bent in the middle, many times 
longer than the dark-brown palea. — Dry soil, Florida, and northward. April, 
Te 
14. STREPTACHNE, R. Brown. ; 
Grasses with the habit of Aristida. Spikelet 1-flowered; flower stalk 
Glumes 2, loose, awnless. Pales 2; the exterior cylindrical-involute. Awn 
terminal, simple, jointless, twisted below; the inner palea included, awnless. 
Stamens 3. Styles 2. Stigmas plumose. 
1. S.? Floridana, n.sp. Culms (2° high) simple, slender, erect; leaves 
. long, filiform, convolute, smooth ; sheaths hairy at the throat; panicle (1? long) 
narrow, erect, the rough branches by pairs, scattered ; spikelets short-stalked ; 
glumes equal, linear, purple, 1-nerved, the lower one awn-pointed, hispid-serru- 
late on the back, the upper smooth, truncated, mucronate-awned ; pales raised 
on a slender bearded stalk, smooth, shorter than the glumes ; the lower one lin- 
ear-subulate, gradually tapering into the long compressed curved awn, convo- 
lute, and enclosing the capillary inner one. — South Florida, Dr. Blodgett. 
15. ARISTIDA, L. Winr-Gmass. -+ 
