first, scabrous along the keel, especially toward the rigid, sul.iilate apex, rarely 

 somewhat pubescent near the base, usually about one-fourth shorter than the 

 nearest llowcring glumes; flowering glumes 12 to 15 mm. long, lanceolate, very 

 acute or eubaristate-pointed, 5-uerved, margins scarioas, rather densely pubes- 

 cent ou the back for nearly two-thirds the length, the upper third glabrous; 

 palea nearly as long as the glume, minutely ciliate on the keels near the apex; 

 joints of the rachilla densely pubescent. 



Idaho and Washiu-tou. This species is represented in the National Herbarium 

 by No. 466 Sandberg and Leiberg, Washington, collection of 1893; No. 356 

 E. Talmer, collected at Idaho Falls, Idaho, July, 1893. 

 In habit this grass very closely 



resembles Ehjmns flarrscens ^ ^ ^^.^^ / J| 



Scribn. & Smith, having simi- 

 lar creeping rootstucks, long 

 leaves and elongated, oiteu 

 branching spikes. It may at 

 once be distinguished, how- 

 ever, by having the flowering 

 clumes clothed merely with a 

 short and oppressed pube- 

 scence, while in E. Jtaresceiis 

 the flowering glumes are 

 densely villous with rather 

 long, usually yellowish and 

 spreading hairs. A grass 

 which corresponds very well 

 with the description of E. da- 

 sysiacliys, diftering from the 

 var. llitoralis here described 

 in its broader leaves, shorter 

 spikelets, rather narrower and 

 proportionately longer empty 

 glumes and with flowering 

 glumes pubescent nearly to 

 the tips, is reiiresented in the 

 National Herbarium by No. 

 1176, W. N. Suksdorf, collected 

 near Rockland, Klickitat 

 County, Washington, .July 3, 

 1890. A closely related form, 

 evidently belonging to this 

 species and possibly relerable 

 to var. aaper of Kegel, distin- 

 ofuished bv its less distiuctlv 

 creeping rootstocks, shorter 

 leaves which are not strigose- 

 j)ubesccnt above, shorter 

 spikes and fewer-flowered spikelets, which have the flowering glumes pubescent 

 (|uito to the apex, is represented by specimens in the National Herbarium, col- 

 lected at Ten Gulch, Colorado, by Trof. J. W. Letterman, August, 1885, and by 

 Dr. George A'asey at the .same locality, August, 1884. This form has some char- 

 acters in common with E. cuigmtiis, ^n\t differs from the grass referred to that 

 species in Bulletin No. 4, p. 38, in its awnkss glumes and more rigid spikes. 

 E. aiKjiistiis may at once be distinguished from any form of E. (htsystachijii by its 

 fewer-flowered spikelets, these being 2- to 3-flowered, while in E. uaaystachys 

 they are 4- to 9-flowered. 



Yic. i.—Elymusfavescenfi Scribn. & Smith. 



