252 



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



1mm 







Figtjbe 335. — Elymus fiavescens, X 1. (Merrill and 

 Wilcox 160, Idaho.) 



cm. long, sparsely long-villous, es- 

 pecially toward the apex; lemmas 

 firm, 1 to 1.5 cm. long, tapering in- 

 to a short awn. % — Dunes and 

 sandy shores, British Columbia to 

 northern California. 



4. Elymus fiavescens Scribn. and 

 Smith. (Fig. 335.) Culms erect, slen- 

 der, glabrous, 50 to 100 cm. tall, the 

 rhizomes slender, nearly vertical from 

 deep slender horizontal rhizomes with 

 brown scales ; sheaths glabrous ; blades 

 firm, glabrous beneath, scabrous 

 above, 2 to 5 mm. wide, flat, or 

 involute in drying; spike 10 to 25 

 cm. long, sometimes with short 

 branches, somewhat nodding; spike- 

 lets 2 to 3 cm. long, several-flowered, 

 approximate or somewhat distant; 

 glumes very narrow or subulate, 

 pubescent, nerveless, mostly unequal, 

 1 to 1.5 cm. long; lemmas awnless, 

 densely silk}^- villous, the hairs long, 

 yellowish or brownish. % — Sand 

 dunes, eastern Washington and Ore- 

 gon, Idaho; South Dakota (Black 

 Hills). 



5. Elymus arenicola Scribn. and 

 Smith. (Fig. 336.) Resembling E. 

 fiavescens 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. 



Figure 336. — Elymus arenicola, X 1. (Palmer 356, 

 Idaho.) 



Figure 337. — Elymus innovatus, X 1. (Hayward 

 2719, S. Dak.) 



6. Elymus innovatus Beal. (Fig. 

 337.) Resembling E. fiavescens; spike 

 rather dense, 5 to 12 cm. long, the 



