34 POACEAE. 



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

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

 Larimer Co. 



2. Trisetum majus (Vasey) Rydb. (7'. sithspicatuiii major Vasey; T. sub- 

 spicatum Coult.. mainly; not Bcauv. ) 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 Vasej'. In moist places, especially among bushes 

 from southern Wj-o. 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. mcUcoidcs Coult; not 

 Beau v.) 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 argentcum 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. 



