MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 213 



Montana: Manhattan, 1895, Rydberg, 26^4; East Gallatin 

 Swamps, 1896, Flodinan, 568; Belt Park, 1889, ^- ^- Williams, lyi. 



* Potentilla ctenophora Rydberg, Mem. Dept. Bot. Columbia Univ. 



2 : 75 ; Potentilla flabcllifirnnis ctcnofhora Rydb. Bull. Torr. Bot. 



Club, 24: 7. 



Nearly related to the preceding and scarcely more than a variety 

 of it. Differs in the larger flowers, more contracted cyme, and the 

 broader segments of the leaves, the margins of which are not revo- 

 lute. It approaches P. Blasclikcajia in general habit. Open valleys, 

 at an altitude of 1000-2000 m. 



Montana: Bridger Mts., 1896, Flodinan, j6g ; Elk Mts., 570, • 

 Madison Co., 3frs. McXiilty. 



* Potentilla quinquefolia Rydberg, Mem. Dept. Bot. Columbia Univ. 



2: 76; Potentilla nivea pcntaphvlla Lehm. Stirp. Pug. 9 : 69 ; 



not P. fentafihxlla Richt. 



Most resembles P. nivea L. but the basal leaves are commonly 

 5-foliolate, with the middle leaflet more or less stalked. It is in our 

 region a strictly alpine plant, growing at an altitude of 3000 m. or 

 more, but in British America it occurs at much lower altitudes. 



Yellowstone Park: Electric Peak, Aug. 18, 1897, Rydberg & 

 Bessey, 43 gy. 



* Potentilla Hookeriana Lehm. Ind. Sem. Hort. Hamb. 1849: 10 



[Rydb. Mon. 84]. 



Nearest related to P. nivea, but differs in the more deeply dis- 

 sected leaves, the smaller flowers and the bracllets which equal the 

 sepals. 



Montana: 1883, W. M. Canby, 103 (?). 

 Potentilla nivea L. Sp. PI. 499 [Man. R. M. 85 ; 111. Fl. 2: 210; 



Rydb. Mon. 84]. 



No specimens have been seen from Montana, but it is found both 

 north and south of the state and may be expected on the highest 

 mountains. 



* Potentilla uniflora Ledeb. Mem. Acad. St. Petersb. 5 : 543 [Rydb. 



Mon. ^%'\. 



A near relative of P. nivea, differing in the lower stem, larger 

 flowers, and short cuneate more deeply dissected leaves. It grows on 

 the tops of the highest mountains, at an altitude of 3000 m. or more. 



Montana: 1883, Canby, 104. 



