MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 47 



Montana : Old Hollowtop, Pony, July 7, iSg"] ,Rvdbc7'g d- Besscy, 

 3628 and jdj-j. 



Yellowstone Park: Yellowstone Lake, 1885, Tivccdy, 6^j. 



* Poa reflexa Vasey & Scribner, Contr. U. S. Nat. Herb, i: 276. 



It is nearest related to Poa arctica, but distinguished by the longer 

 reflexed branches and smaller spikelets. It is common along brooks 

 at an altitude of 2000-3000 m. Poa aciuni)iata Scribner is only a 

 larger flowered form of this species. 



Montana: Bridger Mts., 1896, Plodiiiaii, iig and 120: Elk 

 Mts., near Black Hawk; Long Baldy, Little Elk Mts., 122 and 

 123; Park Co., 1887, F. Tzvccdy ; Mt. Blackmore, 1886, 7027; 

 East Gallatin, 1886, 1028: Belt Mts., 1882, Sci'ihner^ ^g2 ; Cedar 

 Mountain, July 16, 1897, Rydhcrg d- Bcssey, 3616 and 363c; 

 Bridger Caiion, 1896, Rydhcrg, 3213 and 3218; Elk Mts., j2po,' 

 Little Belt Mts., 3337 and 33gi . 



Yellowstone Park: 1885, Tzi'ccdy, 638 and 63 g; Electric 

 Peak, Aug. 28, 1897, Rydhcrg d Bcssey, 3613; East De Lacy's 

 Creek, Aug. 10; Yellowstone Lake, 187 1, Hayden. 



A very depauperate form of this or a nearly related species was 

 collected in the Yellowstone Park, 1884, by Tweedy, 27^. 



*Poa Grayana Vasey, Cont. U. S. Nat. Herb, i : 272. 



It is a stoloniferous plant, 3-4 cm. high, with a narrow drooping 

 panicle, and characterized by its lanceolate, acute floral glumes. It 

 is an alpine plant growing at an altitude of over 3000 m. 



Montana: McDonald's Peak, 1883, Caiihy, 376. 



Yellowstone Park: Soda Butte Creek, 1885, Tzvccdy, 634.. 



(This was determined by Prof. Scribner as P. Pattcrsonii, to 

 which it scarcely belongs, however, judging from the specimens of 

 that species in the Columbia Herbarium.) 



Poa Eatoni Watson, Bot. King's Exp. 5: 386 [Man. R. M. 422]. 

 In rich soil in the mountain regions, rare. 

 Montana: 1883, Scribner, 400. 



Poa alpicola Nash; Poa laxa^Xwxxh. Bot. Cal. 2: 312 [Man. R. 



M. 421] ; not Haenke. 



On the highest mountain peaks at an altitude of over 3000 m. 



Yellowstone Park: Electric Peak, Aug. 18, 1S97, Rydhcrg 

 d- Bcssey, 3613. 



