5r>i r.RAMixi:.i:. (cuass iamii.v.) 



palcii 5-iu'rvccl, rouyli-koelcil, about as loiif; us tlic awn, imi(!i l()ii;,'(r llian the 

 liairs at tlie Imsc. — Swamps, Xortli Carolina, and nortliward. Auj^. and Sept. 

 — Culms 2° -3° high. Leaves somi-what glaucous. Panide fj° long, puri)lisii. 



§ 2. AMMOPIIILA. — dhimes and jmlexK somewhat corhccous: panicle spike-like. 

 2. C. arenaria, Eoth. Culms and elongated convolute leaves rigid ; pan- 

 icle long (5' -9'), cylindriral; lower palca 5-ncrved, obscurely awncd, 3 times 

 as long as the liairs at the base. — Sandy sca-shorc, North Carolina, and north- 

 •vvard. Aug. — Rootstock creeping. Culm 2° -3° high. Spikelcts, like the 

 whole plant, whitish, ^' long, 



13. STIPA, L. rKATMEK-GRASS. 



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

 spikelcts, with very long awns. Glumes 2, membranaceous, nearly equal, awn- 

 Icss and persistent. Paleoe coriaceous, involute, raised on an obconical bearded 

 stalk, the lower one with a twisted or contorted awn jointe<l with its apex. Sta- 

 mens 3. Grain terete, enclosed in the palca'. 



1. 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, K. Brown. 



Grasses with the habit of Aristida. Spikelet 1 -flowered ; flower stalked. 

 Glumes 2, loo.se, awnless. Palea 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 (\° long) 

 naiTow, erect, the rough branches by pairs, scattered ; spikelcts 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 ; paleaj 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. BlodtjeU. 



15. ARISTIDA, L. Wire-Grass. 



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

 racemose or spiked-panidcd 1-flowered spikelcts nearly as in Stipa, but the lower 

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

 No. 9). Upper palea minute. Grain linear. 



* Gliiiiics unequal, the upper one shorter. 

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

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

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



