240 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 



In these forms the sheaths are smooth. Echinochloa walteri (Pursh) 

 Heller is a closely allied native species with hirsute sheaths and long- 

 awned spikelets. 



All the species of Echinochloa are 

 grazed by horses and cattle, but 

 usually grow in situations where they 

 can not well be utilized. 



FIG. 146. Barnyard grass, Echinochloa crusgalll. Plant, 



and fertile floret, X 10. 



two views of spikelet 



