236 MISC. PUBLICATION 200, U. S. DEPT. OF AGKICULTURE 



Agropyron intermedium (Host) Beauv. Blades short, involute, 

 acutish; glumes about 5-nerved; lemmas awnless. % — Ballast at 

 Camden, N.J.; adventive from Europe. 



Agropyron trichophorum (Link) Richt. Blades flat; spikelets 

 pubescent, awnless; glumes several-nerved, acutish. % — Lynn, 

 Mass.; adventive from Europe. 



Agropyron junceum (L.) Beauv. Blades loosely involute; spikelets 

 glabrous; glumes 9-nerved, acutish. % — Ballast near Portland, 

 Oreg.; adventive from Europe. 



11. Agropyron vulpinum (Rydb.) Hitchc. (Fig. 454.) Culms 50 

 to 75 cm tall, somewhat genicu- 

 late at base ; blades drying loosely 

 involute, 10 to 12 cm long, 2 to 4 

 mm wide; spike nodding, 10 to 15 

 cm long, the rachis stiffly sca- 



Figure 450.— Distribution of 

 Agropyron riparium. 



brous-ciliate on the angles; spike- 

 lets imbricate but not appressed, 

 some toward the base two at a 

 node, 3- to 5-flowered, the rachilla 

 appressed-pubescent; glumes 



-Agropyron albicans, X 1. (Griffiths 

 3013, Wyo.) 



Figure 452.— Distribution of 

 Agropyron albicans. 



scabrous, strongly 5-nerved, awn- 

 tipped; lemmas 5-nerved toward 

 the minutely toothed apex, 

 coarsely pubescent, the scabrous figure 451. 

 awn 8 to 10 mm long. % (Ely- 



mus vulpinus Rydb.) — Known only from wet meadows, Grant 

 County, Nebr. 



12. Agropyron subsecundum (Link) Hitchc. Bearded wheat- 

 grass. (Fig. 455.) Green or glaucous, without creeping rhizomes; 

 culms erect, tufted, 50 to 100 cm tall; sheaths glabrous or rarely pubes- 

 cent; blades flat, 3 to 8 mm wide; spike erect or slightly nodding, 

 6 to 15 cm long, sometimes unilateral from twisting of the spikelets to 

 one side, the rachis scabrous or scabrous-ciliate on the angles, some- 

 times, disarticulating; spikelets rather closely imbricate, few-flowered 

 the rachilla villous, the callus of the florets short-pilose; glumes broad 

 rather prominently 4- to 7-nerved, nearly as long as the spikelet, 



