POA GRAMINE A 757 
Oregon. 
P. reflexa Vasey & Scribn. Cat. Grasses U. 8. 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 reflexed, 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%4 line long; the 
second 134-2 lines long, 3-nerved, oval; flowering glumes slightly pubescent 
at base, 134-2 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 dicecious 
loosely tufted perennial: stems rather slender, from slender stoloniferous 
‘rootstocks, 114-3 feet high, erect, smooth: leaves ofsterile shoots numerous, 
flat or conduplicate, 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 giumes ovate, acute, carinate, hispid on 
the keels,144-11¢ 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, ciliate on 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 bf 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, theJonger 154 
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 214-3 
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 
tufted, 10-16 inches high, slender, the lower portin bearing. about 2 
sheaths with very short blades: ligules about 1 line long: panicle 144-3 
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 the glumes. On grassy 
slopes, Clearwater Valley, Idaho. 
P. ineurva Scribn. « 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 recurved, convolute, smooth 
below, minutely hispidulous above and at the-.acute apex, 1-244 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 244 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 14 lines long, flowering glumes 
rounded on the back densely pubescent. below rather broadly scarious- 
