221 



j> Ob 



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

 A densely csespitose perennial, with erect, simple or sparingly 

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

 spreading, densely flowered spikes 2 to 3 cm. long. — Sandy plains, 

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



