MANUAL OF THE GRASSES OF THE UNITED STATES 235 



9. Agropyron albicans Scribn. and Smith. (Fig. 451.) Similar 

 to A. dasystachyum; glumes awn-pointed, about 1 em long; awn 



Figure 447.-^1, Agropyron dasystachyum, X 1. (Griffiths 488, Wash.) B, A. elmeri, X 1. (Type.) 



of lemma 1 to 1.5 cm long, divergent 

 and dry hills, South Dakota to 

 Alberta, 'and Colorado (fig. 452). 



10. Agropyron 

 griffithsii Scribn. 

 and Smith. (Fig. 

 453.) Resembling 

 A. albicans, differ- 

 ing chiefly in hav- 

 ing glabrous lem- 

 mas. 21 — Open 

 dry, sandy or al- 

 kaline soil, western North and South 

 Dakota, Wyoming, and Colorado. In 



when dry. <2l 



-Plains 



Figure 448.— Distribution of 

 A. dasystachyum. 



Figure 449.— Agropyron riparium, X 1. (Nelson 3965, Wyo.) 



the type specimen the lemmas are smooth but in several other specimens 

 the lemmas are scabrous. Possibly only a glabrous form of A. albicans. 



