764 GRAMINEiE «)A 



BR>GROSTIB 



bearing a single spikelet : spikeleta 2-3-flowered, 3-4 lines long, rather 

 broadly ovate : empty glumes somewhat unequal, the first broadly lanceol- 

 ate, 1-nerved, subacute, the second much broader than the first, 3-nerv_ed, 

 from subacute to broadly truncate at the eroae-dentate apex : flowering 

 glumes glabrous, 2-3 lines long, distinctly 5-nerved, obtuse and eroae- 

 dentate at the scarioua apex : palets a little shorter than the glumes. On 

 the summits of high ridges. Malheur county Oregon. 



P. Bnckleyana Nash Bull. Torr. Bot. Club. P. tenuifolia Buckley. 

 A slender tufted perennial : stems erect, 12-20 inches high, usually glab- 

 rous and tinged with brown or pink: eheatha smooth, the lower longer 

 than the internodes : ligules 1-2 lines long, acute or acaminate, radical 

 leaves numerous, flat or conduplicate, 2-6 inches long, less than 1 line wide, 

 often abruptly acute at the apex, thoae of the stem 2, 1-2 inches long : 

 panicle erect, narrow, 1-3 inches long, its filiform branches in twos or threes, 

 3-12 lines long, erect or somewhat spreading : spikelets rather firm 3-5 lines 

 long, mostly 3-flowered, pubescent, elliptical-lanceolate: empty glumes 

 obtusely keeled, 3-nerved near the base, the first linear-lanceolate, about 

 1% lines long, second elliptical-lanceolate, about 2 lines long: flowering 

 glumes 2-2^ lines long, elliptical or linear-oblong, acute.to obtuse entire or 

 erose, pubescent on the lower third,puberulentahDye.; palets linear, 2-tooth- 

 ed, 2 lines long. Common on dry plains, eastern Oregon to Brit. Columbia. 



Tar. stenophylla Vasey, Beal grasses N. Am. ii, 580, under Atropis. 

 Stems stouter : panicle open in flower : spikelets 4-6-flowered : glumea slight- 

 ly larger. On dry hillsides near Roaeburg Oregon. 



P. Canbyi Olyceria Canbyi Soribn. An erect smooth stout perennial : 

 stems simple 3}^-4 feet high : sheaths ahorter than the internodes : ligulea 

 broad, obtuse, 3-4 linea long: leaves of the stem 3-4; flat below, conduplicate 

 above, 7 inches long, 3-5 lines wide: panicle linear or lanceolate, usually 

 interrupted below, about 7 inches long, its branches in half-whorls, erect 

 or ascending, densely flowered, the longer 2-4 inches long : spikelets 3-5- 

 flowered: empty glumes oval, acute or obtuse, almost keeled, 3-nerved, the 

 first 13^-2 linea long, aecond 2-3 linea long: flowering glumes oval, scabrous 

 2-2J^ lines long, 5-nerved, often irregulary toothed at the acute apex: 

 palets 2 lines long, narrow, 2-toothed at the apex. In the Cascade Moun- 

 tains of Washington, 



46 EEAGEOSTIS Beanv. Agrost. 70, t. 14, fig. 11. (1812 ) 



Annual or perennial grasses with flat leaves and contracted 

 panicles. Spikelets two- to several-flowered, more or less flat- 

 tened. Two lower glumes empty, unequal, shorter than the flow- 

 ering ones, keeled, one-nerved, or the second one three-nerved: 

 Flowering glumes membranous, keeled, three-nerved. Palets 

 shorter than the glumes prominently two-nervdd or two-keeled, 

 usually persistent on the rachella. Stamens. 2 or 3. Styles dis- 

 tinct, short, with plumose stigmas. Grain free, loosely enclosed 

 in the glume and palet. 



E. reptans Nees Agrost. Bras. 514. A glabrous annual : stems 1-18 

 inches long, creeping, often forming mats 2-20 inches in diameter and 1-6 

 inches high, branching, the branches erect or ascendiife: sheaths shorter 

 than or equalling the internodes, villous at the summif :" ligules a ring of 

 short hairs : leaves 1-2 inches long, )^-l line wide, flat, smooth beneath, 

 rough above: spikelets dioecious, 10-35-flowered, 2-8 lines long: empty 

 glumes unequal, the flrst )^-% as long as the second : flowering glumes about 

 IH lines long, broadly ovate, acute : palets shorter than the glumes, ciliate 

 on the keels. In wet places Oregon to the Eastern States. . 



