758 GRAMINEJ5 poa 



margined above, about 2 lines long : palet nearly or quite equalling the 

 glume. Olympic Mountains Washington at about 6000 feet elevation. 



P. occidentalis Vasey & Scribn. Cont. U. S. Nat. Herb, i, 274. A 

 loosely tufted, perennial: stems slender, 2-3 feet high, rather weak, more 

 or less scabrous : sheath shorter than the internodes : ligules ovate, 1)^-2 

 lines long, leaves of the stems 3-6, flat, 2-7 inches long, 1-3 lines wide : 

 panicle 4-10 inches long, its filiform branches in pairs or threes, or solitary 

 below, the longest 2-6 inches long, bearing 2-6spikelets near the extremi- 

 ties: spikelets ovate or ovate-lanceolate, 3-4 lines long, usually 4-flowered : 

 first empty glume lanceolate, 1-nerved, 1% lines long, acuminate; second 

 ovate- lanceolate, 2% lines long; flowering glumes oblong-lanceolate, 2>£-3 

 lines long, acute, very thinly pubescent on the marginal nerves and the 

 lower half of the keel : palets nearly as long as the glume. In moist woods, 

 northern Oregon to Alaska. 



P. Kelloggii Vasey Grasses Pac. Slope, ii, 79. Stems tufted, from 

 stoloniferous rootstocks, slender, 2-3 feet high : leaves from the base num- 

 erous with short scarious sheaths, and flat or looselyinvolute blades 6-12 

 inches long: leaves of the stem usually 3: sheaths nearly smooth, nearly 

 equalling or exceeding the internodes, the upper one extending nearly to 

 the panicle : ligules 1 line long, or less : panicle pyramidal, open, its scab- 

 rous branches divergent or horizontal, 1-3 inches long : spikelets oblong, 

 compressed, 3 lines long, loosely 2-3-flowered: empty glumes ovate, acute, 

 hispid on the keel, the first 1-nerved, 1% lines long; the second ^ line 

 longer and 3-nerved, ; flowering glumes lance-ovate, acute, smooth except' 

 the long thin web at the base, 5-nerved nearly to the apex, the midnerve 

 barely excurrent, about 2 lines long : palet linear-oblong, 2-toothed, 

 nearly smooth on the green keels, % line shorter than the glumes. Eas- 

 tern Oregon to California. : * 



P. Bolanderi Vasey Bot. Gaz. vii, 32. A loosely tufted perennial: 

 stems erect, or slightly geniculate below, somewhat thickened at the base, 

 smooth: basal leaves thin and lax, smooth, 3-6 inches long, of the stems 

 3-4: sheaths smooth, closed at the throat, shorter than the internodes: 

 ligules obtuse, 1)^-2 lines long : stem leaves 2-4 inches long, about 2 lines 

 wide, flat, rather abruptly pointed, thin and smooth: panicle erect, slen- 

 der, 4-6 inches long, its branches smooth, 2-4 at each of the 4 or 5 distant 

 nodes, erect or at length spreading: spikelets 1-3-flowered, 1)^-2 lines 

 long : empty glumes ovate, nearly acute, smooth, the first 1-nerved, 1 line 

 long, the second obscurely 3-nerved and longer : flowering glumes ovate- ; 

 oblong, obtuse or barely acute, scarious-margined, nearly smooth except 

 the slight web at the, base, 5-nerved, \%. lines long; palet oblong, obtuse, 

 green, nearly smooth, slightly shorter than the glume. In moist places in 

 the Coast Mountains, Oregon to California. 



P. Howellii Vasey & Scribn. Cat. Grasses U. S. 82. A densely tuf- 

 ted pale green perennial with fibious roots : stems erect, nearly smooth, 

 1-2 feet high : sheaths nearly smooth, half open above, shorter than th£ 

 internodes: ligules 2-3 lines long, obtuse and lacerate at the apex : basal 

 leaves numerous, flat, thin, 3-6 inches long, 1-2 lines wide; of the stem 

 2 or 3, flat, or involute near the attenuate points, 2-4 inches long : panicle 

 rather loose and open, 5-8 inches long, its branches 2-5 at each of the 5 or 

 6 nodes, erect until near maturity, the longer 2-3 inches long: spikelets 

 2-3 lines long, loosely 2-5-flowered : empty glumes ovate, acute, thin, green, 

 sparingly hispid on the keels, 1-13^ lines long: flowering glumes ovate, 

 acute, green except the narrow membranous, margins, pubescent through- 

 out,. 5-nerved, \% lines long: web at base thin, about as long as the glume : 

 palet oblong, emarginate, nearly smooth, on the green keels, slightly shor- 

 ter than the glume. In dry open places in forests, western Oregon to Cal. 



P. purpurascens Vasey Bot. Gaz. vi, 297. Stems wiry, erectj 1-2 



