554 GRAMINE^. (grass FAMILY.) 



palca 5-ncrvcd, rougli-kcclcd, about as long as the awn, much longer than the 

 hairs at the base. — Swamps, North Carolina, and northward. Aug. and Sept. 

 — Culms 2° -3° high. Leaves somewiiat glaucous. Panicle ^° long, purplish. 



^ 2. AMMOPIIILA. — 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 2° - 3° high. Spikelets, like the 

 whole plant, whitish, ^' long. 



13. STIPA, L. Featiier-Grass. 



Perennial grasses, with convolute leaves, and loose panicles of 1-flowcred 

 spikelets, witii very long awns. Glumes 2, mcmbr.inaccous, nearly equal, awn- 

 Icss and persistent. Palece coriaceous, involute, 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 paleae. 



I. S. avenaeea, 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. 



14. STREPTACHNE, P. Brown. 



Gr.asses with the habit of Aristida. S;)ikck't 1-flowcrcd ; flower stalked. 

 Glumes 2, loose, awnless. Palca; 2 ; the exterior cylindrical-involute. Awn 

 terminal, simple, jointless, twisted below ; the inner palca 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-seiru- 

 latc on the back, the upper smooth, truncated, mucronate-awned ; palea; raii^cd 

 on a slender bearded stalk, smooth, shorter than t!ie glumes ; the lower one lin- 

 ear-subulate, gradually tapering into the long compressed <'urvcd awn, convo- 

 lute, and enclosing the capillary inner one. — South Florida, Dr. BloJycU. 



15. ARISTIDA, L. Wikk-Guars. 



Dry and harsh perennial grasses, growing in barren soil, with narrow leaves, 

 racemose or S[)iked-panicled 1-flowered spikelets nearly as in Stijia, but tlie lower 

 palea ending in a triple awn, which is continuous with its apex (except in 

 No. 0). U[)j)(;r palca minute. Grain linear. 



* (ilnmrs unequal, the upper onr shorter. 

 1. A. lanata, Poir. Culms stout (2°- 3° high), Fim|)le; leaves flat, rough 

 on the tipper side, the sheaths, like the axils of the loose panicle, woolly ; lower 

 palea (4" lofig) as long as the upper glume and lateral awns, and one half as 



