POACEAE. 35 



2. Avena Mortoniana Scribn. On mountain tops of Colo. — Alt. 13,000- 

 14,000 ft. — Mountains near Silver Plume; Gray's Peak; Robinson, Summit 

 Co.; Cameron Pass; Beaver Creek; Mt. Garfield. 



3. Avena americana Scribn. On ridges and hillsides from Sask. to Alb., 

 S. D. and Colo. — Alt. about 10,000 ft. — Ruxton Dell. 



4. Avena fatua L. Wild Oats. Naturalized from Europe and Asia, in 

 grain fields from Minn, to B. C, Colo, and Calif. — Alt. about 5000 ft. — Fort 

 Collins. 



36. DANTHONIA DC. Wild Oat-grass. 



Flowering glume pubescent only on the margin and at the base. 



Spikelets on slender, spreading and somewhat drooping pedicels ; stem leafy 

 throughout. i. D. californica. 



Spikelet on short erect pedicels in a dense, spike-like inflorescence ; stem 

 naked above. z. D. intermedia. 



Flowering glumes hairy on the back as well as on the margins and base ; in- 

 florescence spike-like, with short, erect branches. 

 Empty glumes 15-20 mm. long. 3. D. Parryi. 



Empty glumes 10 mm. or less long. 4. D. spicata. 



I. Danthonia californica Bolander. In wet meadows from Mont, to B. C, 

 Colo, and Calif. — Alt. 5000-10,000 ft. — Steamboat Springs; along the Michi- 

 gan, North Park; pasture, Walton Creek flats; Arapahoe Pass. 



n. Danthonia intermedia Scribn. In meadows and on mountain slopes from 

 Alb. to B. C, Colo, and Calif. — Alt. 9000-11,500 ft.^Silverton ; Red Dirt 

 Divide, Routt Co. ; Middle Park ; Dead Lake ; near Pagosa Peak ; Ruxton 

 Dell; Rabbit-Ear Pass; Marshall Pass. 



3. Danthonia Parryi Scribn. In mountain valleys from Alb. to N. M. — 

 Alt. 8500-10,000 ft. — Twin Lakes; Empire City; South Park; Chicken Creek, 

 west of Mt. Hesperus; Bear Creek Caiion; Georgetown; Ute Pass; Ruxton 

 Dell; Dillon. 



4. Danthonia spicata (L.) Beauv. In dry soil from Newf. to B. C, N. C, 

 La. and Colo. — Alt. about 6500 ft. — North Cheyenne Caiion. 



Tribe 8. CHLORIDEAE. 



37. SPARTINA Schreb. Marsh-grass, Cord-grass. 



First glume awn-pointed, equalling the third; second glume long-awned. 



I. 5". cynosuroides. 

 First glume acute, shorter than the third; second glume acute. 



;;. S. gracilis. 



1. Spartina cynosuroides (L.) Willd. In swamps and streams from N. S. 

 to Mackenzie River, N. J., Tex. and Colo. — Alt. 4000-6000 ft. — Near Boulder; 

 Fort Collins; Tobe Miller's ranch; Poudre Cafion. 



2. Spartina gracilis Trin. In saline or alkaline meadows from Sask. to 

 B. C, Colo, and Ariz. — Alt. 4000-5500 ft. — Grand Junction; Sagauche Creek; 

 Cafion City. 



38. BECKMANNIA Host. Slough-grass. 



I. Beckmannia erucaeformis (L.) Host. In swamps and wet meadows 

 from Ont. to Alaska, Iowa, Colo, and Calif. — Alt. 4000-9000 ft. — Gunnison; 



