AGROSTIB GRAMINE^E 727 



glumes about 2 lines long, acuminate-lanceolate, scabrous on the keel : 

 flowering glume much shorter than the outer ones, densely hairy at base, 

 obtuse, not awned. On the plains of southeastern Oregon to California. 



A. canina L. Sp. 62. Stems slender, erect, 1-2 feet high, simple, 

 smooth: sheaths shorter than the internodes: ligules 1-1) lines long: 

 leaves 1-3 inches long by a line wide, scabrous : panicle 2-7 inches long, 

 contracted in fruit, its slender branches ascending or spreading in flower : 

 spikelets a line long, onappressed pedicels: empty glumes subequal, acute, 

 strongly scabrous oh the keel : flowering glume about % as long as the 

 outer ones, obtuse, smooth, bearing a straight or somewhat bent awn on 

 the back just above the middle: palet minute or none. In meadows, 

 Alaska to California and Pennsylvania. 



A. Hallii Vasey Contri. Nat. Herb. 3, 74. Stems erect, simple, 

 stout, smooth, 2-3 feet high: sheaths slightly roughened, usually crowded 

 below . ligulea acute, 2 lines long : radical leaves numerous, mostly involute, 

 3-6 inches long, 1-2 lines wide: panicle 6-9 inches long, narrow, its bran- 

 ches in clusters.of 5-10, slender, scabrous, erect or slightly spreading, un- 

 equal : empty glumes lanceolate, acute, subequal, 1-1J^ line long, 1-nerved, 

 hispid on the keel: flowering glumes oblong, obtuse, thin, smooth except 

 2 tufts of short hairs at the base, 6-nerved,% line long: palet wanting. In 

 moist meadows, Washington to California. 



A. Diegocnsis Vasey. A. foliosa Vasey. Stems erect, or decumbent 

 at base, smooth, 1-2 feet high: sheaths close, equalling or exceeding the 

 internodes: ligules obtuse, 1-2 lines long: leaves flat, 4-8 inches long, 2-3 

 lines wide: panicle loose, 3-6 inches long, its slender scabrous branches 1-2 

 inches long, spreading or ascending: empty glumes ovate, acute, 1-nerved, 

 !-!> lines long, usually equal, the lower one scabrous on the keel : flower- 

 ing glume ovate-oblong, nearly equalling the outer ones, smooth except a 

 tuft of hairs at base, 4-nerved above, the nerves terminating in 4 short 

 teeth; awn arising at the middle or below, %-2 lines long: palet wanting. 

 On open hillsides in the mountains, Brit. Columbia to California. 



A. geminata Trin. Unifl. 207. Densely cespitose : stems slender, erect, 

 8-14 inches high, from a perennial root : leaves flat, mostly basal, 1-3 

 inches long: panicle loose, 2-4 inches long, its capillary branches mostly 

 in pairs, spreading: empty glumes nearly equal \%-\% lines long, lanceo- 

 late, scabrous on the keel : flowering glume less than a line long, obtuse 

 or retuse; awn arising about the middle, not surpassing the glume. 

 Washington to Alaska. 



A. atteuuata Vasey Bot. Gaz. xi, 337. Stems slender 2-3 feet high, 

 from running perennial roots-tocks, usually solitary : sheaths shorter than 

 the internodes, smooth: ligules 2-3 lines long, lanceolate, often lacerate at 

 the acutish apex : leaves few, 3-6 inches long, 1-2 lines wide : panicle 2-6 

 inches long, the unequal capillary branches in fascicles of 2-7, spreading 

 or ascending : empty glumes equal, oblong-lanceolate, acuminate, about 

 1)4 lines long, scabrous on the keel : flowering glume oblong, obtuse, % as 

 long as the outer ones : palet wanting. In wet mountain meadows, Oregon 

 to California. 



. A. Scouleri Trin. Agrost. ii, 83. Stems slender, erect, 1-2 feet high, 

 from a perennial root, somewhat rigid: sheaths smooth, longer than the 

 internodes ligules about 1 line long, obtuse, often lacerate : leaves 3-4 

 inches long, flat or involute, 1^ lines wide, tapering to a long point: pan- 

 icle long-exserted, open and few-flowered ; the lower branches over an inch 

 long, clustered : empty glumes about 1 line long, acute, the lower a little 

 longer and roughened on the keel, the upper roughened only at the tip: 

 flowering glume 5-nerved, entire and somewhat truncate at the apex : palet 

 hyaline, very minute. Nootka Sound to California. 



