776 GRAMINE.E AGROPYRON 



HORDEUM 



volute, 4-7 inches long, 2-3 lines wide, those of sterile shoots narrower and 

 sometimes half as long as the stems: spikes 3-7 inches long; spikelets 6-12 

 lines long, 7-13-flowered: empty glumes lanceolate, acuminate or awn-poin- 

 ted, scabrous on the nerves: flowering glumes 4-6 lines long, narrowly 

 lanceolate, acute to awn-pointed, rounded on the back ; smooth or thinly 

 pubescent. In meadows, Oregon to Brit. Columbia and Minnesota. 



Var. molle Scribn. tfc Smith 1, c. Glumes and rachis more or less 

 villous-pubescent. Washington to the Saskatchewan and New Mexico. 



A. Elmer! Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 11, 54. Stems 

 erect 3-5 feet high, from strong creeping rootstocks: sheaths smooth, the 

 lower ones longer than the internodes ligulea short, minutely fringed along 

 the edge: leaves 6-12 inches long, 2-6 lines wide, strigose, scabrous above, 

 smooth beneath, long attenuate-pointed spikelets 6-10-flowered : empty 

 glumes lanceolate, very acute or subaristate, rigid, about 1 line long, 3- 

 nerved, scabrous on the nerves: flowering glumes broadly lanceolate, sharp- 

 ly acuminate, 5-nerved, short-pubescent on the back. On sandy banks of 

 Snake river, Washington. 



A. dasystachyum var. suhvillosum Scribn, & Smith 1. c. 33. More 

 or less glabrous : stems slender 2-4 feet high : sheaths nearly as long as the 

 internodes: ligules a mere ring : leaves of sterile shoots K~K as long as 

 the stems: spikes 5-7-flowered: empty glumes ovate-lanceolate acute to 

 acuminate: flowering glumes 3-5 lines long, pubescent tolanate. Eastern 

 Washington to Montana and Colorado. 



A. laiiceolatum Scribn. & Smith 1. c. 34. Pale yellowish-green 01 

 glaucous : stems 2-3 feet high : sheaths somewhat inflated, shorter than 

 the internodes : ligules very short ; leaves 6-12 inches long, about 2 lines 

 wide, scabrous beneath and on the margins; pubescent to thinly hirsute 

 above; spikes 4-6 inches long; spikelets 5-10 lines long, 4-7-flowered ; 

 empty glumes unequal, narrowly lanceolate, or oblanceolate, acuminate, 

 3-4 lines long, 3-5-nerved ; scabrous on the nerves ; flowering glumes. 4-7 

 lines long, broadly lanceolate, acute, mucronate, truncate or bidentate, 

 rounded on the back, more or less pubescent, 3-nerved and scabrous toward 

 the apex. Eastern Oregon and Washington to Idaho, 



A. pseudorepens Scribn. & Smith 1. c. 34. Stems 1-3 feet high, erect 

 or ascending from a geniculate base : sheaths glabrous, shorter than the 

 internodes : ligules 1 line long or less ; leaves scabrous throughout, 4-8 inch- 

 es long, 1-3 lines wide; spikes 3-8 inches long: spikelets 3-7 flowered, 

 8-9 lines long, erect, and appressed : empty glumes linear-lanceolate acu- 

 minate or awn-pointed, 5-nerved, scabrous on the nerves and scarious- 

 margined: flowering glumes linear-oblong, acuminate, rounded on the back, 

 5-nerved, scabrous. Washington to Brit. Columbia, Nebraska and Texas. 



Var. magnum Scribn. & Smith 1. c. 35. Robust, 3-4 feet high : 

 leaves 8-22 inches long: spikes 6-8 inches long, one-side; spikelets crowded, 

 acute, an inch long. Idaho to Montana and Colorado. 



A. ^REPENS Beauv. Agrost. 146. Stems 1-4 feet high, from long runn- 

 ing jointed rootstocks: sheaths usually shorter than the internodes, glab- 

 rous: leaves 3-12 inches long, 1-5 lines wide, smooth beneath, scabrous 

 above : spikes 2-8 inches long, strict : spikelets 3-7-flowered : empty glumes 

 strongly 5-7-nerved, usually acute, or awn-pointed: flowering glumes 

 acute or short-awned. Naturalized from Europe. 



53 HORDEUM L. Sp. 84. 



Annual or perennial grasses with flat leaves and terminal 

 cylindrical spikes. Spikelets 1-flowered, usually in threes at 

 each joint of the rachis, the lateral generally imperfect. Rachilla 



