200 



Fig. 194. BOUTEIiOUA XJNIFLORA Va^ev. Bot. Gaz. 16 : 20. 1891. ONE- 

 FLOWERED GRAMA.— A slender, erect perennial 3-1.5 dm. (l°-li°) high, with 

 narrow, long-attenuate-pointed leaves and numerou.s (twenty to seventy-five) 

 spreading or deflexed 1-flowered spikes approximate along the common axis, 

 each bearing one spikelet (o) 6-8 mm. (3"-4") long, .subtended by a glume- 

 like prolongation of the rachis: .second empty glume twice as long as the first, 

 slightly exceeding .the flowering glume (ft ), which is minutely 3-toothed; rudi- 

 ment reduced to a single awn, shorter than the glume. The palea is shown 

 at c. Leaves narrow, subinvolute, one-half as long as the culm.— Southwestern 

 Texas. September. 



