AGHOBTis GRAMINEjE 727 



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

 owering glume much slvorter 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, . 1t2 feet high, simple, 

 smooth: sbeatha shorter tha.n the , interuodes : 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: 

 spikeleta a lin6 long, on'appressed pedicels : empty glumes subequal, acute, 

 strongly scabrous on the fceel : flowering glume about % as long as the 

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

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

 Alaska to California and Pennsylvania.' 



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

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

 below ; ligules 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 6-10, slender, scabrous, erect or slightly spreading, un- 

 equal : empty glumes lanceolate, acute, subequal, 1-1!^ 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. DiegOiinsis 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, 

 1-1)^ 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 hair^ at base, 4-nerved above, the nerves terminating in 4 short 

 teeth; awn arising at' the middle or below, 3^-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 basa}, 1-3 

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

 in pairs, spreading : empty glumes nearly equal IJ^-l)^ lines long, lanceo- 

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

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

 Washington to Alaskai 



A. attennata 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 gluii^e oblong, obtuse, % as 

 loi)g as the outer ones : palet wanting, In wet mountain meadows, Oregon 

 to California. 



A. Sconleri 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,']^ lines wide, tapering toa 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 6-Jierved, entire and somewhat truncate at the apex : palet 

 hyaline, very minute. Nootka Sound ,to California. 



