416 GRAMINE.E. (GRASS FAMILY.) 



2. D. sericea, Nutt. Stems not tufted, 1 to 3 feet high : leaves narrow, 

 with sheaths silky-hairy at the throat: panicle narrow, the lower rays some- 

 times 2 to 3-flowered and spreading : outer glumes acuminate, much exceed- 

 ing the florets : flowering glumes with very long teeth, and villous with long silky 

 hairs all over or only below and on the margins. jSray, Man. 640. Colorado to 

 California ; also eastward in the Atlantic States. 



27. SCHEDONNARDUS, Steud. 



Low and branching, often procumbent, chiefly annuals, with narrow leaves 

 and slender spikes. 



1. S. TexamiS, Steud. Stems to 2 feet high, leafy below, naked and 

 curved above : panicle of 3 to 10 recurved secund distant spikes, 3-angled 

 and rough : outer glumes suddenly narrowing to awn-like points : flowering 

 glume but partly covered by the outer ones. Lepturus paniculatus, Nutt. 

 From Illinois to Texas, Colorado, and California. 



28. BOUTELOUA, Lag. GRAMA GRASS. 



Very slender grasses, often geniculate at base, with short leaves less than 

 a line broad, and ligule a hairy fringe. Watson in Proc. Am. Acad. xviii. 

 178. 



1. Spikes two or more, linear or oblong, more or less falcate, the usually very 

 numerous spikelets pectinately crowded on one side of the rhachis: terminal 

 empty glume usually 3-awned. 



# Lower glumes villous. 



1. B. hiTSUta, Lag. Tufted, 8 to 20 inches high: leaves flat, lance- 

 linear, papillose hairy or glabrous : spikes 1 to 4, oblong-linear, very dense : 

 upper glume hispid with strong bristles from dark warty glands : flowering 

 glume pubescent, 3-cleft : sterile glume and its pedicel glabrous, the 3 awns 

 longer than the glumes and fertile flower. Colorado to Mexico, and east- 

 ward to Texas and Illinois. 



2. B. oligOStachya, Torr. Glabrous, 6 to 18 inches high: leaves very 

 narrow : spikes 1 to 5, oblong-linear, very dense : glumes sparingly soft-hairy : 

 pedicel of the sterile glume copiously villous-tufted at the summit ; the 3 awns 

 equalling the larger glume. Gray, Man. 621. From the Saskatchewan to 

 Texas, Mexico, and S. California. 



* * Lower glumes glabrous. 



3. B. polystachya, Torr. Stems 3 to 15 inches long: leaves scabrous: 

 spikes 3 to 6 or more, narrowly linear, dense, the scabrous rhachis hispid- 

 ciliate: flowering and sterile glumes 3-awned, with usually broad lobes be- 

 tween the awns. Pacif. R. Rep. v. 366. From S. Colorado to S. California, 

 Mexico, and Texas. 



4. B. eriopoda, Torr. Spikes more loose and slender : flowering and sterile 

 glumes \-awned, bearded at base: peduncle villous. S. Colorado (Brandegee) 

 to New Mexico and W. Texas. 



