600 GKAMINE.E. (GRASS FAMILY.) 



34. CALAMAGROSTIS, Adans. REED BEST GRASS. 



Tall perennial grasses, with simple erect culms, hearing a loose or contracted 

 panicle of 1 -flowered spikelets, aud mostly the hairy pedicel of a second flower 

 at the base of the palet. Glumes nearly equal, compressed-keeled. Floret 

 with a ring of hairs at the base, its glume mostly awued on the back. Stamens 

 3. Grain free. 



1. DEYEUXIA. Rudiment of a second flower plumose: glumes membrana- 

 ceous, the flowering one awned on the buck. 



1. C. Nuttalliana, Steud. Culms 2 -3 high; leaves rigid; panicle 

 spike-like; glumes rather rigid, long-pointed, 3" long, the keel very scabrous; 

 awu hair-like, above the middle of the glume. Wet ground. Sept. 



2. C. Canadensis, Beauv. Culms 2 -4 high; leaves flat, thin ; pan- 

 icle open in flower, closed in fruit; glumes smoothish, 1-J" long, short-pointed; 

 awn hair-like, at the middle of the glume. Mountains of North Carolina. 

 July. 



-2. CALAMORILFA. Rudiment of a second flower none : glumes chartaceous, 



aivnless. 



3. C. Curtissii, Vasey. Culms 2 C - 3 high ; leaves narrow-linear, smooth ; 

 panicle contracted, loosely branched, 1 long; glumes 2" long, the upper 

 equalling the floret, the lower one third shorter ; hairs of the floret few and 

 short. East Florida (Garber, Curtiss). 



3. AMOPHILA. Rudiment of a second flower plumose: (jlumes charta- 

 ceons, the flower ing one mucronate or obscurely aimed nt the tip. 



4. C. ar enaria, Roth. Culms 2 - 3 high, from long creeping rootstocks ; 

 leaves rigid convolute; panicles spiked, 5'- 10' long; glumes V long, rigid, 

 twice as long as the scanty hairs. Sandy coast of North Carolina. Sept. 



35. THURBERIA, Benth. 



A low tufted annual grass, with erect branching culms, soft-hairy leaves, 

 and 1-flowered spikelets in an erect narrow terminal panicle. --Lower glumes 

 unequal. 3-nerved, hispid. Floret included, its glume smooth, coriaceous, 

 armed below the apex with a stout bent dorsal awn ; palet thin, with an awn- 

 like pedicel at its base. Stamens 2. Grain free. 



1 T Arkansana, Benth. Culms &' -12' high. Leaves shorter than 

 the 'culm; panicle 2' -3' long. -Coast of West Florida, and westward. 



April. 



36. STIPA, L. FEATHER GRASS. 



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

 spikelets, with very long awns. Lower glumes membranaceous, nearly equal, 

 awnless and persistent. Floret coriaceous, raised on an pbconical bearded 

 stalk, its glume with a twisted or contorted awn jointed with its apex. Sta- 

 mens 3. Grain terete. 



1. S. avenacea, L. Culms (l-2 high) clustered; leaves narrowly 

 linear, rough, the lowest elongated ; awn pubescent, bent in the middle, many 

 times longer than the dark brown floret. Dry soil, Florida, and northward 

 April. 



