183 



Fig. 165. Avena ameiicana (Scribn.) (A. pratensis var. ameri- 

 cana Scribu. ; A. hooheri Scribn.). American Oat. A rigidly erect 

 perennial 3 to 6 dm. high, with narrow, firm leaves, and con- 

 tracted panicles 8 to 12 cm. long. Open thickets and prairies, 

 Manitoba, and in the foothills of the Rocky Mountains south- 

 ward to Colorado. June-August. 



