764 GRAMINE.E poa 



EIUGROSTI8 



bearing a single spikelet : spikelets 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-nerved, 

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

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

 dentate at the scarious 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: sheaths smooth, the lower longer 

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

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

 often abruptly acute at the apex, those 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 : spikeletsTather firm 3-5 lines 

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

 obtusely keeled, 3-nerved near the base, the first linear-lanceola'te, about 

 \% 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, puberulent above : palets linear, 2-tooth- 

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



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

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

 ly larger. On dry hillsides near Roseburg Oregon. 



P. Canfoyi Glyceria Canbyi Scribn. An erect smooth stout perennial : 

 stems simple 33^-4 feet high : sheaths shorter than the internodes : ligules 

 broad, obtuse, 3-4 lines 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 l}4-2 lines long, second 2-3 lines long: flowering glumes oval, scabrous 

 2-2)^ 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 ERAGROSTIS Beauv. 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-nerved 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 ascending : sheaths shorter 

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

 short hairs: leaves 1-2 inches long, %-\ line wide, flat, smooth beneath, 

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

 glumes unequal, the first %r% as long as the second : flowering glumes about 

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

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



