Bui. 201, U. S. Dept. of Agriculture. 



Plate VIII. 



Fig. 1 .— Sporobolus Wrightii on the Valley Floor, Eroded into Tussocks, 

 ■Southwestern Arizona. 



FlQ. 2.— ECHINOCHLOA CRUS-GALLI, A VOLUNTEER CROP, NEAR WESTFALL, OREG. 



