MANUAL OF THE GRASSES OF THE UNITED STATES 



255 



wide; spike slender, erect or somewhat nodding, 4 to 12 cm long, 

 usually about 5 mm thick (excluding awns), the slender rachis tardily 

 disarticulating; spikelets imbricate, appressed, mostly 2-flowered, about 

 1 cm long, excluding the awns; glumes very narrow, scabrous, slightly 

 divergent but not bowed out at base, the midnerve usually distinct ; lem- 

 mas scabrous toward the apex, extend- 

 ing into slender straight awns 1 to 2 cm 

 long. % — Meadows and open ground, 



Figure 498.— Distribution of 

 Elymus macounii. 



Figure 499.— Elymus 

 aristatus, X 1. (Chase 

 4762, Idaho.) 



Figure 497.— Elymus 

 macounii. Disartic- 

 ulating spike. X 1. 

 (Anderson, Mont.) 



m 

 1 













Figure 500.— Distribution of 

 Elymus aristatus. 



Minnesota to Alaska and eastern Wash- 

 ington, south to Iowa, Nebraska, New FlGURE 501 '~mon?^3 r D°ei? X L (Com * 

 Mexico, and California (fig. 498). 



16. Elymus aristatus Merr. (Fig. 499-) Culms tufted, rather leafy, 

 erect, 70 to 100 cm tall; sheaths glabrous, blades flat, 5 to 10 mm wide; 

 spike erect, dense, 6 to 14 cm long, 5 to 10 mm thick, the rachis tardily 

 disarticulating; spikelets closely imbricate, of ten in threes, 1- to 2-flow- 

 ered, about 1 cm long, excluding the awns; glumes subsetaceous, sca- 

 brous, 10 to 20 mm long; lemmas slightly wider than in E. macounii, 

 sparsely scabrous at least on the upper half, the slender straight awn 

 10 to 20 mm long. % — Meadows and open slopes, at middle alti- 

 tudes, Idaho and Washington, south to Nevada and California (fig. 500). 



$5974°-35i 17 



