221 



h a- 



Fig. 203. Bouteloua rothrockii Vasey. Rothrock's Grama.— 

 A densely crespitose perennial, with erect, simple or sparingly 

 branched leafy culms 1.5 to 2 dm. high, and live to nine more or less 

 spreading, densely flowered sjiilies 2 to 3 cm. long. — Sandy i)lain8, 

 mesas and foothills, Arizona. [Mexico.] August, September. 



