2 



5-nerved, oblong, obtuse or subacute, minutely scabrous on the back, sparsely 

 pubescent at the base, more densely pubescent on the keel and marginal 

 nerves, green below, purplish above with rather broad, scarious, erose-den- 

 tate margins, 4-4^ mm. long. Palet nearly equaling the flowering glume, 

 ciliate on the keels, apex bidentate. 



Type specimen No. 1964, C. V. Piper, dry rocky places, Mt. Rainier, Washington, 

 August 1895. Altitude 2100 meters. 



This species has been most frequently referred to Poa gracilHma Vasey, but dif- 

 fers in its more densely csespitose habit, shorter, flatter leaves, more closely- 

 flowered panicle, larger spikelets and flowers, and in the firmer texture of 

 the flowering glumes. 



3. POA LECKENBYI Scribner, sp. nov. 



A pale green, tufted perennial, about 7^ dm. high, with long, slender leaves, 

 somewhat inflated, persistent basal sheaths and pale rather narrow panicle 

 about U dm. long. Culms smooth, frequently rooted at the basal nodes. 

 Leaves glaucous green, smooth below, rough above and on the margins, • 

 acute ; sheaths smooth, all except the uppermost exceeding the internodes, 

 the lower ones membranous ; ligule about 6 mm. long, acute, or often fim- 

 briately divided, decurrent. Panicle branches erect, flower-bearing nearly 

 or quite to the base, the longer ones about 5 cm. in length. Spikelets com- 

 pressed, oblong-lanceolate, 5-6-flowered, 9-11 mm. long. Empty gliimes sub- 

 equal, 3-nerved, rough-hispid on the nerves, rather narrowly lanceolate, acute 

 or acuminate, 7 mm long, slightly exceeding the lower flowering glumes. 

 Flowering glumes ovate-oblong, 5-nerved, 5-6 mm. long, scarious-margined 

 and often erose-dentate above, hispidulous on the upper and pubescent on 

 the lower half, pubescence most abundant on the keel and marginal nerves. 

 Palet shorter than the flowering glume, 3-keeled, conspicuously ciliate-pubes- 

 cent on the keels and minutely pubescent below between the keels, narrowed 

 above to an erose-ciliate apex. 



Type specimen from Scott, Klickitat County, "Washington, June 5, 1898, collected 

 by A. B. Leckenby for whom the species is named. The grass grows in very 

 sandy soil and is an excellent sand binder. It has something the appearance 

 of Poa nevaclensis Vasey, but may be easily distinguished by its inflated 

 membranous sheaths, larger flowers, and pubescent flowering glumes, which 

 are much less firm in texture. 



4. POA BREVIPANICULATA Scribn. & Williams, sp. nov. 



An erect, rather rigid, ctespitose grass, 1^-3 dm. high, from short, stout rhi- 

 zomes, with a short, broad, closely-flowered, greenish or purplish panicle. 

 Culms smoothish or somewhat roughened below the panicle; lower inter- 

 nodes short, exceeded by the sheaths. Leaves flat or more often conduplicate, 

 smooth below, rough above and on the margins ; cauline leaves 2-8, short, 

 the upper usually reduced to a mucro, the ligule short-truncate, often 

 reduced to a narrow band; leaves of the sterile shoots longer, 1 dm. or more 

 in length, acute with rigid points, ligule obsolete ; basal sheaths persistent. 

 Spikelets compressed, 4-6-flowered, 4-6 mm. long, ovate-lanceolate, rather 

 acute. Empty ghimes unequal, hispid on the keel and more or less scabrous 

 on the back; the lower narrowly lanceolate, acuminate, 1 -nerved; the upper 

 broader, acute, 3-nerved, 3i mm. long. Flowering glumes broadly ovate, 

 obtuse or acutish, strongly pubescent on the lower half of the keel and mar- 

 ginal nerves, minutely scabrous above on the back or sometimes hispidulous, 

 intermediate nerves obsolete, 3^-4 mm. long; palet hyaline with green, 

 hispid-pubescent keels, apex bidentate. 



