poa GRAMINE.E 757 



Oregon. 



P. reflexa Vasey & Scribn. Cat. Grasses U. S. 83. A slender peren- 

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

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

 2-3Hnches long, its branches often reflexed, the "longest 2-4 inches long, 

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

 fldwered : 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 atoloniferous 

 rootstocks, 1)^-3 feet high, erect, smooth : leaves of Sterile shoots numerous, 

 flatorconduplicate, scabrous above, rather thin, 6-12 inches long, 1-2 lines 

 wide, those of the stem usually 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 spikelets near the extremities: spikelets compressed, 4-5 

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

 the keels, 1%-1M lines long : flowering glumes lanceolate, barely acute, scari- 

 ous-margined, scabrous on the nerves or throughout, often villous below 

 but not webbed, 5-nerved, 2-lines long: palets lance-oblong, ciliateon the 

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

 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, erect; those of 

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

 acute, about 1 line long : panicle loose, and flexuous, 3-4 inches long, its 

 scabrous capillary branches in twos or threes or solitary, the longer J. >£ 

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

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

 linear-ovate, acute, with broad scarious margins; flowering glume 2>£-3 

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

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

 Oregon to Idaho. 



P; Sandbergii Vasey Contrib. U. S. Nat. Herb, i, 276. Stems 

 tuftea*, 10-16 inches high, slender, the lower portion bearing about 2 

 sheaths with very short blades : ligules about 1 line long : panicle 1)^-3 

 inches long, sometimes 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 : empty glumes lanceo- 

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

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

 webbed, scarious at the apex: palets equalling 4he glumes. On grassy 

 slopes, Clearwater Valley, Idaho. 



P. incnrva Scribn. & Williams U. S. Dept. Agr. Div. Agrost. Cir. 

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

 sheaths smooth, shorter than the internode: ligude's acute, often irregu- 

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

 below, minutely hispidulous above and at the acute apex, 1-2)4 inches 

 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% lines long : empty glumes unequal, the lower oblong- 

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

 broadly ovate, distinctly 3-nerved, usually \}4 lines loner, flowering glumes 

 rounded on the back densely pubescent below rather broadly scarious- 



