————————————— ST elle err 
POA GRAMINEZ 763 
bia and North Dakota. 
P. levigata Scribn. P. levis Vasey, not Barb. Stems tufted, pale, 
slender, erect, smooth, 2-3 feet high, with 2 or 3 distant leaves; sheaths 
smooth: ligules acute: leaves of sterile shoots narrow, 5-8 inches long, 
those of the stem shorter: panicle narrow, rather loose 4-8 inches long, 
sometimes interrupted below, its brancbes erect or appressed the lower in 
twos or threes, unequal, the longest 1-2 inches long: spikelets linear, 3-5 
lines long, about 5-flowered: empty glumes nearly equal, linear-lanceolate, 
acute, thin, pale and scarious except on the minuetly scabrous midrib: 
flowering glumes 2-274 lines long, linear-oblong, subacute,5 nerved, minute- 
ly scabrous, slightly pubescent on the keel and marginal nerves near the 
base, the apex scabrous and yellowish-tinged in age, somewhat erose: palets 
equalling the glumes, scabrous on the keels. Eastern Washington to 
Brit. Columbia, Montana and Arizona. 
P. longiligula Scribn. U. S. Dept. Agr. Div. Agrost. Cir. 9, 3. A 
cespitose glaucous perennial: stems rather stiff, 16-20 inches high: basal 
sheaths persistent and rather crowded: ligules conspicuous, 2-5 lines long: 
leaves of sterile shoots erect or spreading, usually 6-10 inches long, flat or 
conduplicate, with conspicuous decurrent ligules: cauline leaves shorter, the 
upper ones sometimes reduced to a mere mucro, all rather rigid and mucron-. 
ate-pointed : panicle ovate in outline, 3-5 inches long, its lower branches 1-2 
’ inches long: spikelets compressed, ovate-lanceolate, rather acute, 4-6-flow- 
ered, 3-6 lines long: empty glumes. unequal, more or less rough-hispid on 
the back, the lower lanceolate, acute or acuminate, l-nerved, 3 lines long; 
the upper much broader, 3-nerved; flowering glumes ovate-oblong, obtuse, 
5-nerved, more or less scabrous above, woolly-pubescent on the lower half 
of the keel and marginal nerves, with broad hyaline margins, 224-3 lines 
long: palets much shorter than the glumes, hyaline with green hispid- 
pubescent keels. Oregon to South Dakota and Arizona. 
P. Lettermani Vasey Contrib. Nat. Herb. i, 273. A dwarf densely 
tufted perennial: stems 2-4 inches high: sheaths loose, longer than the 
internodes: ligules rather conspicuous, acute: radical Jeaves flat, 1-2 inches 
long, %-1 line wide; those of the stem 1 or 2, about 1 inch long: panicle 
6-12 lines long, oblong, rather dense, its branches mostly in twos, short, 
erect, with 1-3 spikelets at the extremities: spikelets 114-2 lines long, 2-4- 
flowered, purplish: empty glumes nearly as long as the spikelets, oblong- 
lanceolate, acute, nearly equal, smooth; flowering glumes 1-11 lines long 
ovate-oblong, acute, or subobtuse, obscurely nerved, smooth, scarious at 
the apex: palet nearly equalling the glume, acutely 2 toothed at the apex. 
On mount Rainier Washington at 9000 feet altitude, and Gray’s peak Col. 
P. Pringlei Scribn. Bull. Torr. Bot. Club x, 31. Stems tufted, 5-10 
inches high; slender, wiry, with 1 or 2 leaves: ligules conspicuous, 2 lines 
long: leaves mostly basal, 1-2 inches long, convolute, rigid, those of the 
_ stem with very short or nearly obsolete blades: panicle 6-12 lines long, 
compact, oblong, the few branches mostly in pairs, erect, with 1-2 spikelets 
each: spikelets 3 lines long, mostly 2-flowered, oblong, turgid, purplish: 
empty glumes thin, membranous, ovate-lanceolate nearly as long as the 
florets; flowering glumes about 3 lines long, oblong-lanceolate, subulate, 
scarious at the apex, smooth, obscurely 5-nerved,; palets a little shorter, 
acutely 2-toothed. On the high mountains, California to Washington. 
P. Leibergii Scribn. U. 8. Dept. Agr. Div. Agrost. Bull. 8, 6, t. 11- 
A densely cespitose fibrous-rooted glabrous perennial: stems slender, 2-6 
inches high, the base clothed with loose scarious sheaths: ligules hyaline, 
about 1 line long: radical leaves numerous, 1-2 inches long, about 1 line 
wide, those ot the stem 6-12 lines long, conduplicate when dry, minutely 
scabrous along the margins and at the apex, otherwise smooth: panicle 
simple, of 1-7 spikelets, its lower branches usually in pairs, each branch 
