108 CONTEIBUTIONS FROM THE NATIONAL HEEBAEIUM. 



1. Sitanion moUe J. G. Smith, U. S. Dept. Agr. Div. Agrost. Bull. 18: 17. 1899. 

 Type locality: East side Buffalo Pass, Larimer County, Colorado. 



Range: Colorado and New Mexico. 



New Mexico: Craters; north of Ramah; Box S Spring; Chama. Open slopes, in 

 the Upper Sonoran and Transition zones. 



2. Sitanion caespitosum J. G. Smith, U. S. Dept. Agr. Div. Agrost. Bull. 18: 16. 



1899. 

 Type locality: Near Cliff, New Mexico. Type collected by J. G. Smith in 1897. 

 Range: Southwestern New Mexico. 

 New Mexico: Near Cliff; Mangas Canyon. 



3. Sitanion rigidum J. G. Smith, U. S. Dept. Agr. Div. Agrost. Bull. 18: 13. 1899. 

 Type locality: Cascade Mountains, Wasliington. 



Range: Washington and California to Wyoming and New Mexico. 

 New Mexico: Summit of Oigan Peak {Standley). 



4. Sitanion longifolium J. G. Smith, TJ. S. Dept. Agr. Div. Agrost. Bull. 18: 18. 



1899. 



Type locality: Near Silverton, Colorado. 



Range: 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 hUls, in the 

 Upper Sonoran and Transition zones. 



5. Sitanion brevifoliunx J. G. Smith, U. S. 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 AmarUla; 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. S. Dept. Agr. Div. Agrost. Bull. 18: 19. 



1899. 



Type locality: Tucson, Arizona. 



Range: Colorado to New Mexico and Arizona. 



New Mexico: Carrizo Mountains; Tunitcha Mountains; Cedar HUl; Sierra Grande; 

 Raton; Las Vegas Hot Springs; Santa Fe; San Augustine Plains; Animas Creek; 

 Reserve; Roswell. Upper Sonoran Zone. 



74. ELYMUS L. Wild rye. 



Tall erect perennials with fiat leaves and closely flowered terminal spikes; spikelets 

 2 to 6-fiowered, 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 1. E. triticoides. 



Glumes lanceolate-subulate; spikelets usually single 2. E. simplex. 



