146 Piper New and Interesting American Gra-ssets. 



and Cotton 338; Cow Creek, Griffiths and Cotton 518; Colville Reserva 

 tion, Griffiths and Cotton 391; Prosser, Griffiths and Cotton; Brewster, 

 Griffiths and Cotton 264; Endicott, Elmer 1025. 



Oregon : Silver Creek, Harney County, Cusick 2614; Steen's Mountain, 

 Griffiths and Morris 637 ; Beulah, Leiberg 2316 ; without locality, Howell 

 188 ; Hay Creek, Crook County, Leiberg 210 ; Prineville, Leiberg 309. 



Nevada: White Horse Mts., Griffiths and Morris 442; Winnemucc-a, 

 Griffiths and Morris 29, 38 ; Woodworth, Tracy 262 ; E. Humboldt Mts., 

 Watson 1318. 



California: Mt. Lola, Kennedy and Doten 182; Mountains south of 

 Dixie Valley, Davy, July 5, 1894. 



Idaho : Without locality, Henderson 3076. 



Poa pachypholis sp. nov. 



Perennial, densely tufted, wholly glabrous below the inflorescence, 15 to 

 30 cm. high. Basal leaves numerous, the dead sheaths long persisting ; 

 sheaths often purplish; ligule hyaline, rather firm, acute, 2 mm. long; 

 blades narrow, erect, very smooth, thickish, pale or glaucous, flat or loosely 

 involute, 4 to 10 cm. long, 1 to 2 mm. wide ; culm leaves usually 3, their 

 sheaths exceeding the internodes, their blades short. Panicle dense, 

 oblong, 2 to 5 cm. long; lower rays in twos, rarely in threes, smooth, 

 s pikelet-bearing nearly to the base. Spikelets 3 to 5 flowered, ovate, 6 to 

 8 mm. long, pallid, or more or less tinged with purple. Empty glumes 3.5 

 to 4 mm. long, subequal, ovate, acutish, smooth, thick and firm, with a 

 narrow scarcely hyaline margin, each with three nerves, the lateral ones 

 reaching only halfway to the apex. Flowering glumes similar in texture 

 to the empty ones, broadly oblong, obtuse, 4 mm. long, 5-nerved, the basal 

 half of the nerves pubescent. Palet equalling the flowering glume, the 

 nerves ciliate. 



Ilwaco, Washington, on cliffs wet by the ocean spray, June 22, 1904, 

 C. V. Piper (Type). 



Among North American species this is closely allied only to Poa alpliia 

 L., but is at once distinguished by its narrow involute glaucous leaves and 

 thick glumes. In aspect it resembles Poa unilateral^ Scribn. but it has no 

 close relation to that species. 



Poa cotton! sp. nov. 



A densely tufted perennial, 30 to 50 cm. high, the numerous innovations 

 bearing many filiform glaucous and very scabrous leaves surrounded at 

 base by the old dry sheaths, and bearing rather dense ovate or oblong 

 erect usually purple panicles, 2 to 6 cm. long, on slender nearly naked 

 stems. Culms erect, scabrous, especially just below the inflorescence; node 

 solitary, near the base. Basal leaves very numerous, their sheaths loose, 

 somewhat scabrous, reaching nearly to the node, persistent when dry ; 

 ligule scarious, obtuse, 1.5 to 2 mm. long ; blades narrowly filiform, strongly 

 involute, pale or glaucous, strongly scabrous, abruptly acute, 4 to 20 cm. 

 long, I to \ the length of the culm ; sheath of the culm leaf extending 



