MANUAL OF THE GRASSES OF THE UNITED STATES 



9. Agropyron albicans Scribn. and 

 Smith. (Fig. 313.) Similar to A. 

 dasystachyum; glumes awn-pointed, 

 about 1 cm. long; awn of lemma 1 

 to 1.5 cm. long, divergent when dry. 

 % — Plains and dry hills, South 

 Dakota to Alberta and Idaho, Colo- 

 rado and Utah. 



10. Agropyron griffithsi Scribn. 

 and Smith ex Piper. (Fig. 314.) Re- 

 sembling A. albicans, differing chiefly 

 in having glabrous lemmas, the rachis 

 rarely disarticulating. % — Open, 

 dry, sandy or alkaline soil, western 

 North Dakota to Washington, south 

 to Wyoming and Colorado. In the 

 type specimen the lemmas are smooth, 

 but in several other specimens the 

 lemmas are scabrous. Possibly only 

 a glabrous form of A. albicans. 



Agropyron intermedium (Host) 

 Beauv. Blades short, involute, acut- 

 ish; glumes about 5-nerved; lemmas 

 awnless. Ql — Ballast at Camden, 

 N. J.; adventive from Europe. Planted 

 in the Northwest for pastures and 

 for revegetating range lands. 



Agropyron trichophorum (Link) 

 Richt. Blades flat; spikelets pubes- 

 cent, awnless; glumes several-nerved, 

 acutish. 91 — Lynn, Mass.; ad- 

 ventive from Europe. Planted to some 

 extent in the Northwest. 



Agropyron junceum (L.) Beauv. 

 Blades loosely involute ; spikelets gla- 

 brous; glumes 9-nerved, acutish. % 

 — Ballast near Portland, Oreg. ; dunes, 

 San Francisco, Calif. ; adventive from 

 Europe. 



11. Agropyron vulpinum (Rydb.) 

 Hitchc. (Fig. 315.) Culms 50 to 75 

 cm. tall, somewhat geniculate 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 scabrous-ciliate on the 

 angles; spikelets imbricate but not 

 appressed, some toward the base two 

 at a node, 3- to 5-flowered, the 

 rachilla appressed-pubescent ; glumes 

 scabrous, strongly 5-nerved, awn- 

 tipped; lemmas 5-nerved toward the 



Figure 315. — Agropyron vulpinum, X 1. (Type.) 



237 



Figure 314. — Agropyron griffithsi, X 1. (Williams and 

 Griffiths 164, Wyo.) 



