AGROPYRON GRAMINEZ 775 
or acuminate, slightly unequal, scarious along the margins 3-4 lines long: 
flowering glumes 4 lines long, lanceolate, acute, tipped with a stout div- 
ergent awn 4-5 lines long. On dry plains, eastern Sein and Washington 
to the Rocky Mountains. 
A. caninum Beauv. Agrost. 102. Stems 1-3 feet high, erect, smooth: 
sheaths usually shorter than the internodes, smooth, or the lower some- 
times pubescent: ligules short: leaves 3-9 inches long, 1-3 lines wide, 
smooth beneath rough above: spikes 3-8 inches long, sometimes one- 
sided, often nodding at the top: spikelets 3-6-flowered : empty glumes 414 -6 
lines long, 3-5-nerved, acuminate, awn-pointed or bearing an awn, 1-3 
lines long; flowering glumes 4-5 lines long, usually scabrous toward the 
apex, acuminate into an awn sometimes twice their own length. Eastern 
pereon to Brit. Columbia, New Brunswick and North Carolina: also in 
urope. 
A. tenerum Vasey Bot. Gaz. x, 258. Stems 1-3 feet high, erect, often 
slender, glabrous: sheaths usually shorter than the internodes, glabrous: 
ligules very short: leaves 3-10 inches long 1-2 lines wide, flat, or involute, 
rough: spike 3-7 inches long, usually narrow and slender: spikelets 3-5- 
flowered: empty giumes 4-6 lines long: acuminate or short-awned, 3-5- 
nerved, scabrous, on the margins: flowering glumes 5-6 lines long, 5- 
nerved, awn-pointed or short-awned, scarious-margined, often rough toward 
the apex. On dry plains, easie:xu Oregon to Brit.'Columbia and 
Min nesota. 
Var. longifolium Scribn. & Smith |. c. 30. Stems 3-4 feet high, 
smooth, and shining, rigid: leaves involute, nearly as long as the stems, 
long attenuate-pointed: spike slender, cylindrical, 9-10 inches long: 
glumes all short-awned. Northwestern California to Brit. Columbia. 
A. brevifoltum Scribn. U. S. Dept. Agr. Div. Agrost. Bull, 11, 55. 
Stems slender, densely cespitose, 12-16 inches high, usually geniculate at 
the lower nodes, smooth: lower sheaths scabrous and somewhat purplish, 
smooth: ligules short: Jeaves 114-3'¢ inches long, 1-2 lines wide, 
very acute, strigose, scabrous above, very smooth beneath: spikelets approx- 
imate ,usually 3-flowered, empty glumes narrowly lanceolate, 2-3-nerved, 
scabrous on the keel, short-awned ; flowering glumes 6 lineslong, 5-nerved, 
scabrous on the back, short-awned. Onmountain sides, eastern Wash. 
A. violaceum Vasey Spec. Rep. U. S. Dept. Agr. 45. Stems 6-24 
inches high, erect, smooth: sheaths usually shorter than the internodes: 
ligules very short: leaves 2-6 inches long, 1-3 lines wide, flat or involute, 
rough, or sometimes smooth beneath, spikes I-6 inches long, 2-3 lines 
broad: spikelets 3-6-flowered: empty glumes broad: usually purplish, 
scabrous-margined, 5-7-nerved, 4-6 lines long, acute, or acuminate, some- 
times awn-pointed or long-awned: flowering glumes often purplish, 5-7- 
nerved, scabrous-margined, 4-6 lines long, acuminate or short-awned. 
Idaho to Alaska and Ontario: also in Europe and Asia. 
A. Seribneri Vasey Bull. Torr. Bot. Club x, 128. Stems densely 
tufted, geniculate near the base, slender, 16-30 inches high, sheaths longer 
than the internodes: ligules obsolete: leaves 1-3 inches long, involute, 
narrow and rigid: spikes 2-4 inches long: spikelets 3-6-flowered: empty 
glumes 3-4 lines long, linear-lanceolate, 3-5-nerved, acuminate into a long 
point: flowering glumes oblong-lanceolate, 4 lines long, smooth, the mid- 
nerve extended into a strong spreading or recurved awn. On high moun- 
tains Washington to California and the Rocky Mountains. 
A. Smithii Rydb. A. glaucum of American Authors, not of R. & 8S, 
Glabrous: stems rigid, erect, 1-4 feet high: sheath smooth, shorter than 
the internodes: ligules very short: leaves rigid, bluish-green, smooth or 
slightly scabrous beneath, rough-scabrous on the margins, becoming in- 
