56 
POACEAE. 
4. Sitanion brevifolium J. G. Smith. On hills and mountain-sides from 
Wyo. to Utah, Colo, and Ariz.—Alt. 5000-10,000 ft.—Mancos; Ouray; Mar¬ 
shall Pass; vicinity of Boulder; mountains between Sunshine and Ward, 
Boulder Co.; Twin Lakes; Georgetown; Walsenburg; Colorado Springs; 
La Veta; vicinity of Ft. Collins; Willow Creek, Routt Co. 
5. Sitanion pubiflorum J. G. Smith. On dry hills from Colo, to Ariz. and 
N. M.—Alt. about 6000 ft.—Trinidad. 
69. ELYMUS L. Wild Rye, Lyme-grass. 
Flowering glumes long-awned; empty glumes lanceolate or linear-lanceolate, 
narrowed at the base. 
Spike broad ; spikelets spreading. 
Flowering glumes hirsute or villose. 1. E. canadensis. 
Flowering glumes scabrous or strigose-hispidulous or nearly glabrous. 
Robust; spike usually included at the base; leaves 8-15 mm. wide. 
2. E. robustus. 
Slender; spike exserted; leaves seldom over 5 mm. wide. 
3. E. brachystachys. 
Spike narrow ; spikelets erect. 
Leaves 7-15 mm. wide, spreading; empty glumes lanceolate, acuminate to 
short-awned. 4. E. glaucus. 
Leaves less than 5 mm. wide, usually nearly erect; empty glumes very nar¬ 
rowly linear-lanceolate, long-awned. 
Spike 7-8 mm. thick; awns 30-40 mm. long. 5. E. Saundersii. 
Spike s mm. thick or less; awns 5-10 mm. long. 6. E. Macounii. 
Flowering glumes awnless or short-awned; empty glumes linear-aristiform or 
subulate, or if broader not narrowed at the base. 
Empty glumes aristiform or narrowly subulate. 
Plant stout, 1-2 m. high; spikelets 2-6 at each joint; flowering glumes acute 
or very short-awned; in our form scabrous-stigulose. 
7. E. condensatus. 
Plant slender, 3-10 dm. high; spikelets 1-2 at each joint. 
Flowering glumes broadly lanceolate, acute or minutely awn-pointed, glab¬ 
rous ; rachis scabrous on the sharp angle; spikelets erect. 
8. E. triticoides. 
Flowering glumes narrowly lanceolate, awned ; rachis nearly terete, strigose ; 
spikelets somewhat spreading. 
Flowering glumes glabrous. 9. E. ambiguus. 
Flowering glumes strigose. 10. E. strigosns. 
Flowering glumes villous. 12. E. villiflorus. 
Empty glumes lanceolate-subulate, tapering from a rather broad base; spike¬ 
lets usually singly; flowering glumes glabrous. 11. E. simplex. 
1. Elymus canadensis L. On river-banks and among bushes from N. S. 
and Wash, to Ga. and N. M.—Alt. 4000-7000 ft.—Durango; Fort Collins; 
along Platte River, near Denver; La Porte, Larimer Co.; Salida, Chaffee 
Co.; gulch west of Soldier Canon; Black’s Lake. 
2. Elymus robustus S. & S. On river-banks from S. D. to Ida., Mo. and 
Colo.—Alt. 5000-6000 ft.—Idaho Springs; Black Canon; vicinity of Boulder; 
Fontaine qui Bouille. 
3. Elymus brachystachys Scribn. & Ball. On dry plains and hills from 
Mich, and S. D. to Tex., N. M. and Utah; also in Mex.—Alt. 4000-6500 ft. 
—Rist Canon, Larimer Co.; eastern Colorado; along river, east of Ft. Collins. 
4. Elymus glaucus Buckley. ( Elymus Sibiricus Thurb.; not L.) In mead- 
