250 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



3. Elymus vancouverensis Vasey. (Fi 

 mollis, less leafy; spike somewhat inter- 

 rupted, purplish; glumes narrowly lance- 

 olate, firm, gradually acuminate, 1 to 1.5 

 cm long, sparsely long-villous, especially 

 toward the apex; lemmas firm, 1 to 1.5 

 cm long, tapering into a short awn. 21 



-Dunes and sandy shores, British Colum- 

 bia to northern California. 



4. Elymus flavescens Scribn. and 

 Smith. (Fig. 482.) Culms erect, slender, 

 glabrous, 50 to 100 cm tall, the rhizomes 

 slender, nearly vertical from deep slender 



horizontal rhi- 

 zomes with brown 

 scales; sheaths 

 glabrous; blades 

 firm, glabrous be- 

 neath, scabrous on 

 the upper surface, 

 2 to 5 mm wide, 

 flat, or involute in 

 drying; spike 10 to 25 cm long, sometimes 

 with short branches, somewhat nodding; 

 spikelets 2 to 3 cm long, several-flowered, 

 approximate or somewhat distant; glumes 

 very narrow or subulate, pubescent, nerve 



less, '.. to 



481.) Resembling E. 



man 



mm I 



mm 



m 



:0'i 



W 



III 



ll!/ 



Figure 480.— Distribution of 

 Elymus mollis. 



Figure i7$.— Elymus mollis, X 1. 

 (Henderson 2109, Wash.) 



Ifl 



1.5 cm long; lemmas awn- 

 less^ densely silky- villous, the hairs 

 long, yellowish or brownish. % — 

 Sand dunes, eastern Washington and 

 Oregon, Idaho; South Dakota (Black 

 Hills) (fig. 483). 



5. Elymus arenicola Scribn. and 

 Smith. (Fig. 484.) Resembling E. 

 flavescens to which it is closely re- 

 lated; glumes glabrous or nearly so; 

 lemmas firmer, coarsely pubescent, 

 sometimes sparsely so, or the pubes- 

 cence confined to the base or mar- 

 gins, the pubescence grayish rather 

 than yellow. % — Sandy valleys, 

 often in drifting sand, Washington, 

 Oregon, and Idaho. 



10. 



'■■■<-. 



*V 



Figure 481.— Elymus vancouverensis, X 1. (Piper 812, Wash.) 



