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 diflers in the gla- 

 brous floral glumes and the hairy sheaths and the hairy upper 



I 



surface of the leaf-blades. 



British Columbia: Lower Arrow Lake, June 18, 1890,-/!/^- 

 cou)i ^^ (type in herb. Columbia University), 



Washington; Clallam, igoo, Elmer igo^. 



Elymus Petersonii sp. nov. 



I 



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-I.5 dm. 

 long, 4-5 mm. wide, hght 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 I 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, //. Peterson [Shaw's distribution no.] 4.^6 (type, in herb. 

 N. Y. Bot, Card.), 



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 I mm. long or less, truncate, brown ; spike ex- 

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

 ding ; spikelets i 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 Elymjis and 



Agropyron. The type was originally named Agropyron cant- 



