762 GRA^MINEiE ^°*- 



mostly in pairs, smooth, eacli bearing a single spikelet: pm-plisli, oval or linear 

 3-5-flowere(l, 3-5 lines long: empty glumes obtuse or acute, often erose-denticu- 

 late, broadly scaiious-mai-gined; the first ovate-lanceolate, l-nerred; the second 

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

 nerved, not pubescent nor webbed at base: palets curved, linear, 2X Unes long 

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



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

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

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

 ligulen lr2 lines long: leaves of sterile shoots veiy numerous, oonduplicate, 

 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- ^-4. lines long, 3-5-flowered; empty 

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

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

 emargit)ate 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 Bocky Mountains. 



P. Incida Vasey Cont. U. 8. 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, pale green: empty glumes oblong, abiniptly acute, unequal, l>^-2 

 lines long, smooth, scarious at the upex and mai-gins: flowerinij; glumes 2 

 hnes 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 

 2-2}^ feet high, smooth, often rpoting 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 8-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 glum0S, conspieu- 

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

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



P. Sfevadensls 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 branches 2 or more at each joint, erect: spikelets 

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

 obtuse or subacute, 3-nerved, scabrouf : flowering glumes 3 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- 



