34 POACEAE. 



Lake; Windy Point; Ironton, San Juan Co.; Mt. Bartlett; Devil's Causeway; 

 mountains above Graymont; along the Michigan, North Park; Ethel Peak, 

 Larimer Co. 



2. Trisetum majus (Vasey) Rydb. (T. subspicatum ma for Vasey; T. sub- 

 spicatum Coult., mainly; not Beauv.) In meadows and on hillsides from 

 Mont, to B. C, Colo, and Utah. Alt. 8000-12,000 ft. Below Berthoud's 

 Pass; Middle Park; near Pagosa Peak; Mt. Baldy; Pike's Peak; Marshall 

 Pass; Cumberland Mine; Ironton, San Juan Co.; Cameron Pass; Idaho 

 Springs; Georgetown; Cache la Poudre, Larimer Co.; Upper La Plata; 

 Seven Lakes ; North Park ; Trapper's Lake ; near Chambers' Lake ; along 

 Michigan, North Park; Ute Pass. 



3. Trisetum montanum Vasey. In moist places, especially among bushes 

 from southern Wyo. to N. M. Alt. 7500-10,000 ft. Twin Lakes ; near Pagosa 

 Peaks; vicinity of Ouray; Minnehaha; Idaho Springs; Ruxton Creek; Villa 

 Grove, Saguache Co. ; Beaver Creek ; Cameron Pass. 



34. GRAPHEPHORUM Desv. 



Empty glumes equal or nearly so, 6-7 mm. long. i. G. muticum. 



Empty glumes unequal ; the lower 3-4 mm. long, the upper 4-5 mm. 



Inflorescence open ; culm minutely pubescent at the nodes ; rachilla short-hairy. 



2. G. Shearii. 

 Inflorescence narrow ; culm perfectly glabrous ; rachilla long-hairy. 



3. S. Wolfii. 



1. Graphephorum muticum (Boland.) Scribn. (G. melicoidcs Coult; not 

 Beauv.) In wet meadows from Alb. to Wash., Colo, to Calif. Alt. 9000- 

 10,500 ft. Near Ironton, San Juan Co. ; Marshall Pass ; headwaters of Pass 

 Creek; Cumbres; Barnes' Camp; along Walton Creek; Ute Pass road; 

 Cameron Pass. 



2. Graphephorum Shearii (Scribn.) Rydb. (Trisetum argcnteum Scribn.; 

 not R. & S. ; T. Shearii Scribn.) Among rocks at an altitude of 9000 ft. 

 Las Animas Canon, below Silverton. 



3. Graphephorum Wolfii Vasey. (T. Wolfii Vasey.) In wet places in wil- 

 low thickets. Alt. about 10,500 ft. Twin Lakes; Cameron Pass. 



35. AVENA L. OATS, OAT-GRASS. 



Empty glumes shorter than the flowering glumes ; panicle lax, narrow and some- 

 what nodding; flowering glume hairy at the base. i. A. striata. 

 Empty glumes longer than the flowering glumes. 



Panicle narrow and spike-like, strict; empty glumes 8-14 mm. long; flowering 



glumes hairy only at the base. 



Plant 1-1.5 dm. high; leaves strongly involute; callus of the flowering glume 



and prolongation of the rachilla long-hairy. 2. A. Mortoniana. 



Plant 2-4 dm. high ; leaves mostly flat ; callus and prolongation of the 



rachilla short-hairy. 3. A. americana. 



Panicle open ; empty glume over 2 cm. long ; flowering glumes often hairy up 

 to the base of the awn. 4. A. fatua. 



i. Avena striata Michx. In woods from N. B. to B. C., Pa. and Colo. 

 Alt. 7000-11,000 ft. Crystal Park; mountains, Larimer Co.; Little Kate Mine, 

 La Plata Mountains ; Pennock's mountain ranch. 



