108 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
1. Sitanion molle J. G. Smith, U. 8. Dept. Agr. Div. Agrost. Bull. 18: 17. 1899. 
Tyre Locauity: East side Buffalo Pass, Larimer County, Colorado. 
RanGE: Colorado and New Mexico. 
New Mexico: Craters; north of Ramah; Box 8 Spring; Chama. Open slopes, in 
the Upper Sonoran and Transition zones. 
2. Sitanion caespitosum J. G. Smith, U. 8. Dept. Agr. Div. Agrost. Bull. 18: 16. 
1899. 
Type Locarity: Near Cliff, New Mexico. Type collected by J. G. Smith in 1897. 
Rance: Southwestern New Mexico. 
New Mexico: Near Cliff; Mangas Canyon. 
8. Sitanion rigidum J. G. Smith, U. S. Dept. Agr. Div. Agrost. Bull. 18: 13, 1899. 
TYPE LocALITY: Cascade Mountains, Washington. 
Rance: Washington and California to Wyoming and New Mexico. 
New Mexico: Summit of Organ Peak (Standley). 
4. Sitanion longifolium J. G. Smith, U. 8. Dept. Agr. Div. Agrost. Bull. 18: 18, 
1899. 
Type Locauity: Near Silverton, Colorado. 
Rance: Wyoming and Kansas to Texas and Nevada. 
New Mexico: Abundant from the Mogollon Mountains and Organ Mountains north- 
ward to Las Vegas and westward across the State. Plains and rocky hills, in the 
Upper Sonoran and Transition zones. 
5. Sitanion brevifolium J. G. Smith, U. 8. Dept. Agr. Div. Agrost. Bull. 18: 17. 
1899. 
Elymus brevifolius Jones, Contr. West. Bot. 14: 20. 1912. 
TYPE LOCALITY: Tucson, Arizona. 
RANGE: Washington to Arizona and New Mexico. 
New Mexico: Rio Pueblo; Sandia Mountains; Tierra Amarilla; Santa Fe Canyon; 
Duran; Chama; Grants; Gallo Spring; Mangas Springs; Middle Fork of the Gila ; Organ 
Mountains; Gilmores Ranch. Plains and hillsides, in the Upper Sonoran and Tran- 
sition zones. 
6. Sitanion pubiflorum J. G. Smith, U. 8. Dept. Agr. Div. Agrost. Bull. 18: 19. 
1899. 
TYPE LocaLiry: Tucson, Arizona. 
Ran@eE: Colorado to New Mexico and Arizona. 
New Mexico: Carrizo Mountains; Tunitcha Mountains; Cedar Hill; Sierra Grande; 
Raton; Las Vegas Hot Springs; Santa Fe; San Augustine Plains; Animas Creek; 
Reserve; Roswell. Upper Sonoran Zone. 
74. ELYMUS L. Wrap rve. 
Tall erect perennials with flat leaves and closely flowered terminal spikes; spikelets 
2 to 6-flowered, the uppermost imperfect, sessile, mostly in pairs, at the alternate 
notches of the continuous or jointed rachis, forming terminal spikes; rachilla jointed 
above the glumes and between the florets; glumes 2, nearly equal, rigid, narrow, 1 or 
3-nerved, acute or awn-pointed, persistent; lemmas shorter than the glumes, rounded 
on the back, obscurely 5-nerved, obtuse, acute, or awned from the apex; palea a little 
shorter than the lemma, 2-keeled; stamens 3; styles short; grain adherent to the lemmas 
and paleas. 
KEY TO THE SPECIES, 
Lemmas not awned or with very short awns. 
Glumes aristiform or narrowly subulate; spikelets usually 
2 at each joint............. 0000.0 e eee eee eee eee ee 1. E. triticoides. 
Glumes lanceolate-subulate; spikelets usually single........ 2. E. simplex. 
