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. 2. 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. Parry i. 



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



1. 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. 



2. 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 Canon ; 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 Canon. 



Tribe 8. CHLORIDEAE. 



37. SPARTINA Schreb. MARSH-GRASS, CORD-GRASS. 



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



1. S. cynosuroides. 

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



2. 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 Canon. 



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; 

 Canon 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 ; 



