GRAMINEAE (GRASS FAMILY) 83 



3-9 dm. tall: leaves 5-15 cm. long, 2-5 mm. wide, rough, especially above: 

 spike 5-12.5 cm. in length, narrow, slender, often somewhat flexupus: spikelets 

 appressed to the rachis, single at each node, or the lower sometimes in pairs, 

 1-3-flowered : glumes (occasionally 3) awn-shaped, 3-nerved, rough, 6-8 mm. 

 long, bearing a slender straight rough awn, 6-10 mm. in length; lemmas 7-10 

 mm. long, rough toward the apex, bearing a slender straight awn 6-10 mm. 

 long. From New Mexico into British America. 



4. Elymus innovatus Beal, N. Am. Gr. 2: 650. 1896. Culms slender, erect, 

 rather rigid, 5-8 dm. high: basal leaves scabrous, flat or involute, 2-3 dm. 

 long; culm leaves about 3, the sheaths shorter than the internodes; ligule very 

 short; the blades 4-10 cm. long: spike erect, densely ciliate-pubescent : spike- 

 lets 3-6-flowered, 10-15 mm. long, 2 at each node: glumes mere bristles, 4-12 

 mm. long; lemma ovate-lanceolate, ,8-9 mm. long; palet as long as its lemma. 

 Wyoming to Dakota and British Columbia. 



5. Elymus triticoides Buckley, 1. c. Culms from rootstocks, rather slender, 

 5-8 dm. high: leaves 15-25 cm. long, erect, often loosely flowered: spikelets 

 1-3 at each node, 4-8-flowered: glumes equal, linear-lanceolate, rigid, acumi- 

 nate, 6-10 mm. long, equaled by the floret; lemma firm, lanceolate, acuminate 

 or short-awned, nerves indistinct below, 7 above. Colorado to Montana, 

 west to the Pacific States. 



6. Elymus ambiguus Vasey & Scribn. Contrib. Nat. Herb. 1: 280. 1893. 

 Rigid and densely tufted, 5-10 dm. high: leaves of the sterile shoots erect, 3-4 

 dm. long, involute, smooth or scabrous; culm leaves about 4, 1-2 dm. long; 

 the ligule short: spikes erect, 8-12 cm. long, rachis scabrous: spikelets 2 at 

 each joint, or sometimes single near the end, scabrous, 5-9-flowered: glumes 

 subulate, 12-15 mm. long; lemma firm, obscurely 5-nerved, 8-12 mm. long, 

 the short teeth unequal; awn about 2 mm. long; palet as long as the lemma. 

 Co'orado to Montana. 



7. Elymus salinus Jones, Proc. Cal. Acad. II. 5: 725. 1895. A rigid wiry 

 erect densely caespitose perennial 3-6 dm. high: leaves rather rigid, involute, 

 narrow and spreading: spikes erect, 5-10 cm. long: spikelets usually only one 

 at each node, about 12 mm. long, 5-9-flowered: glumes nearly subulate, un- 

 equal; lemma short-awned, about 8 mm. long. (E. simplex S. & W. U. S. 

 Dept. Agr. Div. Agrost. Bull. 11. 57. 1898.) Saline situations; Wyoming 

 and Utah. 



8. Elymus condensatus Presl. Reliq. Haenk. 1: 265. 1830. Culms 6-30 

 dm. tall: leaves 1.5-3 dm. long or more, 6-24 mm. wide, scabrous, at least 

 above: spike 1-4 dm. in length, usually stout, strict, often interrupted below, 

 sometimes compound at the base: spikelets 3-6-flowered, 2-several at each 

 node of the rachis: glumes awl-shaped, 9-12 mm. long, generally awn-pointed, 

 usually rough, sometimes smooth. Valleys, banks, and ravines mostly in 

 saline situations; throughout our range and westward. 



66. SITANION Raf. 



Tufted grasses with flat or involute leaves and a terminal dense spike with 

 the rachis articulated and readily breaking up. Spikelets numerous, in twos 

 or threes at each joint, 1-5-flowered. Glumes entire or divided, the divisions 

 extending often to the base, the lemmas or their divisions bearing long slender 

 awns; palet 2-keeled. Stamens 3. Styles distinct, short; stigmas plumose. 

 Grain adherent to the palet. 



Leaves and sheaths glabrate or scabrous. 



Leaves long and flexuous . . . . . . . .1.8. longifolium. 



Leaves short and rigid . . . . . . . . . 2. S. brevifolium. 



Leaves and sheaths more or less pubescent. 



Leaves pubescent on both sides . . . . . . . 3. S. hystrix. 



Leaves pubescent beneath, scabrous above . . . . . 4. S. montanum. 



1. Sitanion longifolium J. G. Smith, U. S. Dept. Agr. Div. Agrost. Bull. 18. 

 1899. Tufted, 3-5 dm. high: leaves of the innovations 1.5-3 dm. long, often 

 as long as the culms, glabrous and glaucous or obscurely pubescent: spike sub- 



