272 



empty glnmoa about one-third ahortor than the adjacent florets; floral glumes 

 subacute, about 2 lines long, pubescent below and on the keel, with a thin web 

 of hairs at the base. 



Type specimen collected by George Vasey at an altitude of 8,000 to 9,000 feet in 

 the mouutains of Colorado in 18G8 (No. 673) ; other specimens collected by M. 

 E. Jonea near Georg<;town, Colorado. The spilielets are generally larger than 

 in the typical eastern plant. It differs otherwise in the webby hairs at the base 

 of the florets, and in the erect, not nodding panicle. 



Poa gracillima sp. nov, Cnlms densely tufted, 15 to 20 inches high, erect or ascend- 

 ing from the base, smooth; radical leaves mostly fine, flaccid, and spreading, 2 

 to 5 inches long; leaves of the culm 1 to 2 inches long, slender; panicle 3 to 

 4 inches long, open, ovate or pyramidal, erect; branches spreading, the lower 

 in twos or throes or even flves^ at 5 or 6 nodes, and single iiear the apex, the 

 lower ones 1 to 2 inches long, capillary, naked below, rather few-flowered near 

 the extremity; spikelots 3 to 4 lines long, about 5-flowered, tlie florets somewhat 

 distant; empty glumes ovate-lanceolate, acute, unequal, shorter than the adja- 

 cent florets ; floral glumes 1| to 2 lines long, obtuse orsubobtuse, oblong to oblong- 

 lanceolate, purplish, scarions at the apex, not much compresseil, distinctly 

 5-nerved, sparsely pnberulent, scabrous or pubescent on keel and nerves below» 

 or nearly smooth. 



Oregon and Washington to Idaho and Wyoming. Type specimen collected by 

 W, N. Suksdorf on Mt. Adams, Washington, in 1882 (No. 33). There is consider- 

 able variation in this species, especially as to the spread of the panicle, some 

 forms having a rather narrow, nodding panicle and approaching Foa tenuifolia 

 Nutt. 



Poa grayana sp.nov. Culms loosely tufted, stolon iferons, 12 to 15 inches high, 

 smooth; radical leaves 6 to 8 inches long, narrow, becoming involute, rather 

 stiff; <!ulm leaves about 3, 1 to 3 inches long, erect; ligule membranaceous, 1 or 

 2 lines long, obtuse; panicle 3 to 4 inches long, loose, drooping; the lower 

 branches in pairs, rather distant, 1^ to 2 inches long, spikelet-beariug near the 

 apex, filiform and naked below; the few spikelets rather crowded near the ends 

 of the branches, 3- to 5-flowered, about 3 lines long, purplish; empty glumes 2 

 liiu;s long, nearly equaling or rarely exceeding the adjacent florets, broad, acute, 

 smooth, scarions-margined; floral glumes lanceolate, subacute, mostly less than 

 21iues hmg, the upper part searious and smooth, thelower part villose-pubescent, 

 with no webby hairs at the base. 



Type specimen collected by H. N. Patterson, near Grays Peak, Colorado, in 

 1885 (No. 14). 



Poa hispidula sp.nov. Culms 15 to 18 inches high, stout, smooth, 2- or 3-leaved; 

 leaves flat or becoming involute toward the apex, rigid, erect, 3 to 4 inches long, 



1 to 2 lines wide; sheaths mostly shorter than the internodes, striate, smooth; 

 ligule 1 to 2 lines long; panicle lance-obloug, 4 to 6 inches long, rather close, 

 branches erect, mostly in threes or twos, the lower ones 1^ to 3 inches long, some- 

 what scabrous, naked below, rather densely flowered above; spikelets large, 

 about 3 lines long, about 3-flowered, on short pedicels; empty glumes lanceolate, 

 acute, little shorter than the floral glumes, the upper ones 3-nervcd, hispid on 

 the keel; floral gluuies villous on the keel and lateral nerves, sparsely pubescent 

 between, 2 lines long, scarions at the subacute apex, marginal nerves prominent, 

 with copious webby hairs at the base. 



Type specimen collected at Shnmagin Island, Alaska, in 1871-72, by M. W. 

 Harrington: others at Copts Bay, llnalaska, by Dr. A. Kellogg; and on Bering 

 Island, in 1891, by J. M. Macoun. 

 Poa howellii Vasey & Scribn. in Vasey, 111. N. A. Gr. ii. 78 (1893). Culms tufted, H to 



2 feet high, leafy ; leaves nearly eciuidistant, 2 to 3 inches long, 2 lines wide, about 

 eq^ualing the internodes, acute j sheaths striate, slightly scabrous; ligule 2 lines 



