760 GRAMINEAt POA 
lanceolate 3-4 flowered, about 4 iines long: empty glumes smooth, unequal, 
the lower lanceolate or broader, acute or acuminate, 1-nerved, 1 line long; 
the upper broadly ovate, acute, 3-nerved, about 14% lines long: flowering 
glumes 5-nerved, rough-hispid on the back, oblong-elliptical, obtuse, about 
2 lines long: palets a little shorter than tbe glumes, ciliate on the keels, 
a or bidentate. .In open places in timberland, eastern Washington to | 
olorado. 
P. confinis Vasey Grasses Pac. Slope, ii, 65. A cespitose imperfectly 
diceecious perennial, with long running rootstocks: stems erect, slender, 
4-12 inches high,smooth : sheaths shorter than the internodes, open above: 
ligules a line long to obsolete: leaves of sterile, shoots numerous with smooth 
scarious-margined sheaths and involute blades 2-6 inches long, about 4% 
line wide: panicle oblong, 1-2 inches long its scabrous, branches in threes, 
twos or solitary, 1 inch long or less: spikelets slightly compressed, 2-3 lines 
long, 3-6-flowered: empty glumes broadly ovate, acute, l-nerved, nearly 
smooth, 1-1% lines long, the second slightly longer but neither equalling 
the first floret: flowering glumes broadly ovate, acute, not webbed, 5+neryed, 
about 114 lines long: palets ovate-oblong pubescent on the keels: stamin- 
ate flowers ‘with abortive ovaries, and pistillate flowers with imperfect 
stamens. On sandy ground along the coast, Oregon to Alaska. 
P. flava L. Sp. 68. P. serotina Ehrh. Stems slender, simple or 
rarely branched, smooth, 144-5 feet long: sheaths usually shorter than 
the internodes, smooth: ligules 1-2 lines long: leaves 2-6 inches long, 1-2 
lines wide, smooth or rough: panicle 6-14 inches long, open, the branches 
spreading or ascending, 2-5 inches long: spikelets 3-5-flowered, 144-2 lines 
long: empty glumes rough above on the keels, the lower usually 1-nerved ; 
the upper three-nerved :' flowering glumes obtuse, somewhat webbed at 
‘base, 1-144 lines long, silky-pubescent on the lower half of the marginal 
nerves and the midnerye. In moist meadows, Oregon to Brit. Columbia 
‘and Illinois: also Europe and Asia. 
P. nemoralis L. Sp. 69. Stems slender, 6-24 inches high, erect, sim- 
ple smooth: sheaths usually shorter than the internodes: ligules 44-1 line 
long, truncate: leaves 1-4 inches long, 1 line wide or less, smooth or rough: 
panicle 2-5 inches long, open, its branches erect or ascending 1-2 inches 
long: spikelets 2-5-flowered 144-2'4 inches long: empty glumes acute; or 
acuminate, l-3-nerved: flowering glumes obtuse or acute, 1-1g lines long, 
faintly 5-nerved, somewhat webbed at the base, the middle and marginal 
nerves silky on the lower half. «Eastern Washington to the Eastern States. 
P. qaxavuca Vahl Fl. Dan. t. 964.. Stems erect, 6-24 inches high, rigid, 
glabrous and somewhat glaucous: sheaths longer than the internodes: 
ligules 1 linelong: leaves 1-2 inches long, 1 line wide or less, smooth be- 
neath, scabrous above: panicle 1-4 inches long, open, with erect, or ascend- 
ing branches 6-18 lines long: spikelets 2-4-flowered, 244-3 lines long: empty 
glumes acute, 3-nerved, glabrous, rough on the upper part of the keel: 
flowering glumes 1144-124 lineslong, obtuse or acutish, rough, not webbed 
at the base, the lower part of the midnerve and marginal nerves silky-pub- 
escent. Oregon to the Rocky mountains and Maine: also in Europe. 
P. laxa Henke Sudet. 118. Stems 6-12 inches high, erect: sheaths 
often longer than, the internodes: ligules about 1 line long: leaves 1-3 
inches long, 4-1 line wide, acuminate: panicle 1-4 inches long, its bran- 
ches usually erect, sometimes ascending, | inch long or less: spikelets 3-5- 
flowered, 2-224 lines long: empty glumes usually 3-nerved acute, glabrous, 
rough on the keel at.the apex: flowering glumes 174-1% lines long, obtuse, 
3-nerved, or sometimes with an additional pair of obscure nerves, the 
midnerve pilose on the lower half, rough above; the lateral ones pilose 
below. Washington to Alaska and across the continent:. also in Europe. 
