183 



Fig. 165. Avena americana (Scribn.) (J. pratensis var. ameri- 

 cana Scribn. ; A. hookcri 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 Rockj^ Mountains south- 



ward to Colorado. 



June-August. 



