y4 'POACEAE 



long, _ short-awned or awTi-pointed; lemma 10-13 mm. long, scabrous on the 

 margms. A. unilaierale Cassidy, not Beauv. Scarcely distinct from A. caninum 

 L. of Ell. Meadows and among buslics: Sask.— Minn.— Iowa— N.M.— B.C. 

 Plain — Mont, Je-S. 



8. A. caninoides (Ramaley) Real. Stem 3-10 dm. high; loaf-blades 1.5-3 



dm. long, 3 mm. wide, erect, involute or nearly flat; spike 1-2 dm. long, dense; 



spikelets 1-2 em. long, pale or purple-tinged; empty ghimes 7-9 ram. long, 



short-awned or awn-pointed; lemma 7 mm. long, scabrous. A. caninum Am. 



auth., mo;stly. Mountain meadows: N.S.— Mich.— N.M.— Calif.— Mont, MonL 

 — Siibalp, Jl-Au. 



Stems 2-3.5 dm. high; leaf-blades 



andinum 



2-10 cm. long, 2-4 mm. wide, flat, filabrous beneath, pilose above; spike 3-8 cm. 

 long; empty glumes 8-10 mm. long; lemma 8-10 mm. long, puberulent or glabrate; 

 awTi 4r-] mm. long. High mountains: Mont.— Colo. M onl .—Suhalp . Jl-Au. 



10. A. latiglume (Scribn. & Smith) Rydb. Stems 2-4 dm. high, erect nr 

 often decumbent at the base; leaf-blades 3-10 cm. long, 2-4 mm. wide, flat, or 

 m volute when dry, pube.scent on both sides or sometimes glabrate; spike 3-5 cm. 

 long; spikelets 3 -5-flowered ; lemma oblanccolate, acute or short-awned. High 

 raountams: Alta.— Mont.— Alaska. Suhalp .—Alp . 



11. A. biflorum (Brign.) R. & S. Tufted perennial; stem 1..5-6 dm. high, 

 often somewhat decumbent at the base; leaf-blades 5-1.5 cm. long, 2-6 mm. wide, 

 flat or somewhat involute; spike 2.5-10 cm. long, 4-6 mm. wide; spikelets 

 d-6-tiowered; lemma .5-7-nerved, 8-12 mm. long, acuminate or short-awned. 

 A. violaceum (Homem.) Lange. Mountains: Greenl.— N.Y.— Neb.— N.M.— 

 Alaska; Eurasia. Suhalp.~Alp. Jl-S 



tenerum Vasey. Stem. 3-10 dm. high; leaf-blades 2-6 mm. wide, 

 7-lo cm. long, scabrous, flat or involute; spike slender, 1-1.5 dm. long, lax; 

 spikelets 3-5-fIowered ; empty glumes 10-12 mm. long, acute to awn-pointed, 5- 

 nerved; lemma 8-10 mm. long, lanceolate; awn 1-4 mm. long or more. Rye 

 Grass. Dry soil: B.C.— Calif.— N.M.— Minn. Plain—Suhmonl. Je-Au. 



Stems .3-10 dm. high, glabrous; 



13. A. inerme 



leat-blades erect, 1-2 dm. long, 2-4 mm. wide, more or less pubescent above, 

 somewhat glaucous, flat or involute; spike 1-3 dm. long, lax; spikelets distant, 

 1.5-2 cm. long, 6~10-flowered ; empty glumes 8-10 mm. long; lemma 10-12 mm. 

 long, smooth, often mucronate or with a short awn-tip. Closely related to A. 

 sjncafum and A. Vaseyi. Plains and meadows: B.C.— Wash.— Utah— Wyo. 



Suhmont. Je-Au. 



u\ f A-.fl^^cans_ Scribn. & Smith. Stem erect, 3-6 dm. high, glaucous; leaf- 

 blades rigid, ascendmg, involute, scabrous, 7-20 cm. long, 2-3 mm. wide; spike 

 slightly nodding, 7-10 cm. long; spikelets 8-10, 5-7-flowered, 1.5-18 mm. long; 

 empty glumes pubescent, oblanceolate, acuminate, tipped with an awn 4-6 mm. 

 long; lemnaa about 9 mm. long, ovate-lanceolate; awn 12-15 mm. long. Hills 

 and benchlands. Mont.— Wye— w Neb.— S.D. Suhmont. Je-Au. 



1 }b f' ^^ffl*li?ii Scribn . & Smith. Stem glabrous, 3-8 dm. high, striate; 

 Icat-blaclea rather rigid, mostly involute, 5-12 cm. long; spike erect, 8-15 cm. 

 long; spikelets pale, closely 5-7-flowered; empty glumes 8 mm. long, with awns 

 m^L^o^g; lemma oblong, 8-10 mm. long; awns 8-10 mm. long. Plains: Wyo. 

 — JN .JJ. — h.u. Plmn. Am. 



1 ^^' •^•I'alrneri (Scribn. k Smith.) Rvdb. Stem 3-6 dm. high; leaf-blades 

 glaucouis, 1-2 dm. long, 3-4 mm. wide, at last involute, scabrous and often 

 sparingly pubescent on both sides; spikes rather dense, 1-1.5 dm. long; spikelets 

 compressed, 1..5-2 cm. long; lemma about 1 cm. long, acuminate, pilose to 

 hispidulous-scabrous. Bottom-lands and hillsides: N.M.— Colo.— Utah— Ariz. 

 tion. — Submont. My-Jl. 



t ^h ^' Pseudorepens Scribn. & Smith. Stem 3-10 dm. high, glabrous; 

 leaf-blades scabrous throughout, 12-20 cm. long, 2-6 mm. wide, flat, or involute 



10-16 



