540 Rydberg : Rocky Mountain flora 



long, 7-10 mm. wide, flat, scabrous beneath, usually pilose above; 

 ligules almost obsolete; spike 1.5-2 dm. long; spikelets usually 

 in pairs, 4-5- flowered ; empty glumes 10-12 mm. long, narrowly 

 lanceolate, scabrous on the 4 or 5 nerves, with white or pink 

 scarious margins; floral glumes 10-12 mm. long, glabrous and 

 shining ; awns 8-20 mm. long. 



This is closely related to E. glauais, but differs in the gla- 

 brous floral glumes and the hairy sheaths and the hairy upper 

 surface of the leaf-blades. 



British Columbia: Lower Arrow Lake, June 18, 1890, Ma- 

 coun 44. (type in herb. Columbia University). 



Washington: Clallam, 1900, El 'i/icr 1 go j. 



Elymus Petersonii sp. nov. 



Perennial, with a rootstock ; stem 6-8 dm. high, slender, 

 glabrous ; sheaths glabrous, striate, shorter than the internodes ; 

 ligules very short and truncate ; leaf-blades flaccid, I— 1.5 dm. 

 long, 4-5 mm. wide, light green, minutely scabrous on the veins 

 of both sides, or sparingly pilose above ; spike very slender and 

 lax ; spikelets in pairs or single ; empty glumes narrowly lanceo- 

 late, acuminate or awn-pointed, about 8 mm. long, 3-nerved, purple- 

 tinged ; floral glumes about 1 cm. long, glabrous ; awn about I 

 cm. long. 



This species is also related to E. glaucus, but differs in the lax, 

 interrupted spike, glabrous glumes, and the flaccid and more or 

 less hairy leaf-blades. 



British Columbia : Roger's Pass, Selkirk Mountains, Aug. 9, 

 1904, H. Peterson [Shaw's distribution no.] 446 (type, in herb. 

 N. Y. Bot. Gard.). 



Elymus vulpinus sp. nov. 



Perennial, with a short rootstock ; stems 5-7 dm. high, striate, 

 erect ; sheaths close, striate, glabrous, often shorter than the inter- 

 nodes ; ligule 1 mm. long or less, truncate, brown ; spike ex- 

 serted, 1 — 1.5 dm. long, 6-7 mm. thick, sometimes slightly nod- 

 ding ; spikelets 1 or 2 at each node, 4— 6-flowered ; empty glumes 

 linear-lanceolate, 8— 10 mm. long, 5-nerved, scabrous on the back ; 

 awn scabrous, of about the same length ; floral glumes linear- 

 lanceolate, long-acuminate, about 8 mm. long, hispidulous ; awn 

 8—10 mm. long, scabrous. 



This is one of the species connecting the genera E/yiints and 

 Agropyron. The type was originally named Agropyron cani- 



