POA GRAMINE.E 757 



Oregon. 



P. refle^La Vasey & Scribn. Cat. Grassea U. S. 83. A slender peren- 

 nial 2-5 feet high : ligules 1 line or less long : leaves 2-4 inches long, 1-2 

 lines wide, nearly smooth, flat, abruptly pointed : panicle open, pyramidal, 

 2-4 Inches long, its branches often refle.xed, the longest 2-4 inches long, 

 bearing 2-4 spikelets near the ends: spikelets linear, 4-5 lines long, 2-4- 

 flowered: empty glumes unequal ; the first 1-nerved, 1-1% line long; the 

 second l%-2 lines long, 3-nerved, oval; flowering glumes slightly pubescent 

 at base, l%-2 lines long, oval, abruptly pointed : palets nearly as long as 

 the glumes. Idaho to^Montana, Colorado and New Mexico. 



P. nervosa Vasey Grasses Pac. Slope, ii, 81. A tall often dioecious 

 loosely tufted perennial: stems rather slender, from slender stoloniferous 

 rootstocka, 1)^-3 feet high, erect, smooth : leaves of sterile shoots numerous, 

 flatorconduplicate, scabrous above, rather thin, 6-12 inehea long, 1-2 linea 

 wide, those of the stem uaually 3 : sheaths closed, smooth, shorter than the 

 long internodes: ligules obtuse, 1-2 line long: panicle loose, 3-6 inches 

 long, its lower branches scabrous, 2-4 at each of the 6 or 7 nodes,, 1-2 inches 

 long, bearing 2-'5 apikeleta near the extremities : spikelets compressed, 4-5 

 lines long, 4-7 flowered : empty glumes ovate, acute, carinate, hispid on 

 the keels,l)^-l}^ lines long : flowering glumes lanceolate, barely acuteiacari- 

 ous-marginedi 8cal)rou8 on the nerves, or throughout, often villous below 

 but not webbedl 5-uerved, 2- lines long: paleta lance-oblong, ciliateon the 

 keels, nearly equalling the glumes. In open places in wooded districts 

 California to Alaska and Montana. 



P. Idahoensis Beal Grasses N. Am. ii, 539. A slender tufted erect 

 perennial 20-30 inches high with 2 or 3 distant leaves: leaves of sterile 

 shoots numerous, mostly filiform, 6-10 inches long, flaccid, ereqt; those of 

 the stem with long 8heaths,and erect filiform blades 1-3 inches long; ligules 

 acute, abQut 1 line long: panicle- loose, and flexuous, 3-4 inches long, ita 

 scabrous capillary branches in twoa or threes or solitary, the longer 1% 

 inches long, with few spiltelets near the extremities: spikelets compressed, 

 3-5 lines, long, rather loosley 4-7-flowered : empty gitlmes nearly equal, 

 linear-ov^te, acute, with broad scarious margins; flowering glume 2)^-3 

 lines iong« lance-oblong, subacute, scarious at the apex, minutely scabrous 

 throughout: palet nearly equalling the glume. On rocky slopes, eastern 

 Oregon to Idaho. 



P. Saiijlbergil Vafley Contrib. U. S. Nat. Herb, i, 276. Stems 

 tufted, 10-16-. ipches high, slender, the lower portion bearing about Z 

 sheaths with Vfrrxeliort blades: ligules about 1 line long: panicle l>^-3 

 inches long, someffmer very narrow, the branches ascending, nearly 

 smooth, the lower in twos or threes, unequal, the longer 1-2 inches long: 

 spikelets 2-4-flowered, about 3 lines long, purplish : enipty glumes lanceo- 

 late, subacute: flpwering glumes linear-oblong, obtuse, nearly 2 lines long;, 

 sparingly pubescent or puberulent, somewhat villous near the base but not 

 webbed, scarious at the apex: paleta equalling the glumes. On graasy 

 slopes, Clearwater Valley, Idaho. 



P. incnrra Scribn. A Williams U. S. Dept. Agr. Div. Agrost. Cir. 

 9, 6. Stems slender, closely cespitose, 6-10 inches high, flexuous, smooth : 

 sheaths smooth, shorter than the internode : ligules acute, often irregu- 

 larly fimbriate : leaves rather rigid, flexuously recXirved, convolute, smooth 

 below, minutely hispidulous above and at the acute apex, l-2j^ irichea 

 long, those of the radical shoots much the longest : panicle few-flowered, 

 purplish, its branches mostly solitary : spikelets compressed, loosely 2-3- 

 flowered, about 2}4 lines long : empty glumes unequal, the lower oblong- 

 lanceolate, subacute, indistinctly 3-nerved, about 1 line long, the upper 

 broadly ovate, distinctly 3-nerveil, usually IX lines Innsr, flowering glumes 

 rouqded on the back densely pubescent below rather broadly scarious- 



