762 GRAMINE^K poa 



mostly in pairs, smooth, each bearing a single spikelet: purplish, oval or linear 

 3-5-flowered, 3-5 lines long: empty glumes obtuse or acute, often erose-denticu- 

 late, broadly scarious- margined; the first ovate-lanceolate, 1-nerved; the second 

 oval-lanceolate, 3-nerved, 2 lines long: dowering glumes ovate-lanceolate, 3-5- 

 nerved, not pubescent nor webbed at base: palets curved, linear, 2% lines long 

 £ -toothed, scabrous on the keels. On the plains of eastern Oregon and Wash. 



P. Fendleriana Vasey Grasses Pac. Slope ii, 74. A densely tufted 

 completely dioecious perennial: stems erect, scabrous to nearly smooth, 1-2 

 feet high: sheaths rather loose, scabrous above, shorter than the internodes: 

 ligules 1-2 lines long: leaves of sterile shoots very numerous, conduplicate, 

 6-12 lines long, about 1 line wide: panicle 2-4 inches long, oblong, its min- 

 utely scabrous branches in twos or threes, erect or somewhat spreading, 

 1-2 inches long: spikelets compressed 3-4 lines long, 3-5-flowered: empty 

 glumes broadly ovate, acute, carinate, minutely scabrous, 1-nerved, 1-2 

 lines long the first slightly smaller: flowering glumes ovate-oblong, erose or 

 emarginate at the obtuse apex, carinate, hispid on the keel above and more 

 or less pubescent on the marginal nerves and midnerve below, 2-3 lines long: 

 palets oblong, emarginate, pubescent on the keels. On dry hills, eastern 

 Washington to California and the Eocky Mountains. 



P. lucida Vasey Cont. U. S. Nat. Herb, i, 274. A slender tufted 

 perennial: stems 18-24' inches high, smooth: sheaths equalling or shorter 

 than the internodes, smooth: ligules 2 lines long: radical leaves 5-7 inches 

 long 1-2 lines wide; those of the stem about 3, 2-3 inches long: panicle 4-6 

 inches long, narrow, its branches mostly in twos or threes, the lower ones 

 1-2 inches long, erect or appressed: spikelets 3-4 lines long 3-4-flowered, 

 shining, pule green: empty glumes oblong, abruptly acute, unequal, 1)^-2 

 lines long, smooth, scarious at the apex and margins: flowering glumes 2 

 lines long, linear-oblong, obtuse, sparsely and minutely scabrous, slightly pu- 

 nescent near the base of the keel and lateral nerves, scarious at the apex, 5-nerv- 

 ed: palet nearly equalling its glume. On high hills, eastern Wash, to Colo. 



P. Leckenbyi Scribn. 1. c. 2. A pale green tufted perennial: stems 

 2-2J4 f eet high? smooth, often rooting at the lower nodes : sheaths smooth, 

 all but the uppermost exceeding the internodes, the lower ones membran- 

 ous, inflated: ligules about 3 lines long, acute, often fimbriately divided: 

 radical leaves long and slender, glaucous, green, smooth beneath, rough 

 above and on the margins, acute, flat: panicle 5-7 inches long; its branch- 

 es erect, the longer ones 2-3 inches long: spikelets oblong-lanceolate, 6-7 

 lines long, 5-6-flowered, compressed: empty glumes subequal 3-nerved, 

 rough-hispid on the nerves rather narrowly lanceolate, acute or acuminate 

 4 lines long: flowering glumes ovate-oblong, 5-nerved, 3-5 lines long, 

 scarious-margimed, often erose dentate above, hispidulous on the upper 

 and pubescent on the lower half: palets shorter than the glumes, conspicu- 

 ous, ciliate on the keels and minutely pubescent below, narrowed above 

 to an erose cilate apex. Pry and very sandy soil eastern Washington. 



P. Nevadensis Vasey Scribn. Bull. Torr. Bot. Club x, 66. A loosely 

 tufted perennial: stems rather stout, 20-40 inches high, scabrous below the 

 panicle: ligules shorter than the internodes; ligules about 2 lines long, 

 scabrous : leaves of sterile shoots very narrow, flat or conduplicate, 6-12 

 inches long, scabrous, those of the stems usually 3, with sheaths 4-8 inch- 

 es long and blades 1-4 inches long : panicle narrow rather densely flower- 

 ed, 4-6 inches long, its brandies 2 or more at each joint, erect: spikelets 

 3-5 lines long, 3-8-flowered : empty glumes 1^-2 lines long, nearly equal 

 obtuse or subacute, 3-nerved, scabrous : flowering glumes 2 lines long, 

 oblong, obtuse, scarious-margined above with a few very short hairs at 

 base: palet ciliate on the keels. Moist soil, Oregon to Nevada Brit, Colum- 



