GOO GKAMINE.E. (GRASS FAMILY.) 



34. CALAMAGROSTIS, Adans. Ukeu IJknt Gkass. 



Tall |piTfiiiiial j^ra.sses, with sitiipli- rrcct culins, lieariiiga loos<! or coiitract(;(l 

 j)aiiiilf of l-llowuifd spikelets, and mostly tlio liairv peiliccl of a .second finwer 

 at the liasu of the palet. (ilunies nearly ec|iial, conijiressed-keeled. Floret 

 with a riny of hairs at the hase, its glume mostly awned on the back. Stamens 

 3. (jraiu free. 



§ 1. Dkvkuxia. — liudiiuenl uj' a stcuiid Jlower jjIuiuosc: yltiiuts inciniiuna- 

 ceuus, the Jlower ing one awned on the hack. 



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

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

 awu hair-like, aliuve the middle of the glume. — Wet ground. Sej)t. 



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

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

 awu hair-like, at the middle of the glume. — Mountains of !North Caroliua. 

 July. 



§ 2. C.\LAMORiLFA. — Rudiment of a second Jlower none : glumes chartaceous, 



awnless. 



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

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

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

 short. — East Florida {Garber, Curtiss). 



§ 3. A.MOPHiLA. — Rudiment of a second Jlower plumose : glnmfs charla- 

 reoiis, the flowering one mucronate or obscurely awned at the tip. 



4. C. arenaria, TJoth. Culms 2° -3° high, from long creeping rootstocks ; 

 leaves rigid convolute; panicles spiked, 5' -10' long; glumes -i' 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 wjth a stout bent dorsal awu ; palet thin, with an awn- 

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



1. T. Arkansana, Benth. Culms 6' -12' high. Leaves shorter than 

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



April. 



36. STIPA, L. Feathek Guass. 



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

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

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

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

 mens 3. Grain terete. 



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

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

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

 April. 



