2=;6 



ROSACEAE. 



Vol. II. 



17. Potentilla effusa Dougl. Branched 

 Cinquefoil. Fig. 2243. 



P. effusa Dougl. ; Lehm. Nov. Stirp. Pug. 2 : 8. 1830. 



Plant perennial, 6'-i8' high, diffusely branched 

 above. Leaves pinnate, tomentose-canescent, but not 

 silky; leaflets S-ii, or those of the upper leaves only 

 1-3, oblong, obtuse at the apex, commonly cuneate 

 at the base, incised-dentate, 4'-ii' long; flowers 

 yellow, 3"-S" broad, loosely cymose, yellow ; bractlets 

 much shorter than the lanceolate acuminate calyx- 

 lobes ; petals obovate, emarginate, exceeding the 

 calyx-lobes; stamens about 20; achenes glabrous. 



Prairies, western Minnesota to Saskatchewan, Al- 

 berta, Nebraska and New Mexico. Summer. 



18. Potentilla Hippiana Lehm. Woolly 

 Cinquefoil. Fig. 2244. 



P. Hippiana Lehm. Nov. Stirp. Pug. 2: 7. 1830. 

 Potentilla leucophylla Torr. Ann. N. Y, Lye, 2; 197, 

 1825. Not Pall. 1773. 



Erect or ascending, perennial, branched above, 

 rather stout, i°-2i° high, densely floccose as well 

 as silky. Stipules lanceolate, acuminate, entire; 

 lower and basal leaves petioled, pinnately 5-1 1- 

 foliolate; leaflets oblanceolate or oblong, obtuse, 

 narrowed or cuneate at the base, 6"-i8" long, 

 incisely dentate, very white beneath, the lower 

 ones smaller than the upper, and no smaller ones 

 interspersed; flowers terminal, yellow, loosely 

 cymose, 3"-6" broad; petals obovate, retuse, a 

 little exceeding the lanceolate acute calyx-lobes 

 and slightly narrower bractlets ; stamens about 

 20; style flliform; achenes glabrous. 



Dry soil, northwestern Minnesota and Assiniboia 

 to British Columbia, south to New Mexico and Ari- 

 zona. June-Aug, 



19. Potentilla multifida L. Cut-leaved 

 Cinquefoil. Fig. 2245. 



Potentilla multifida L. Sp. PI. 496. 1753. 



Perennial, stems several or many from the caudex, 

 low, asceding or spreading, appressed-silky. Stipules 

 large, lanceolate, acuminate, scarious, brown; leaves 

 pinnately S-9-foliolate, grayish-tomentose beneath, 

 glabrate above ; leaflets finely divided to near the 

 midrib into linear acute segments, with more or 

 less revolute margins ; petals yellow, a little exceed- 

 ing the ovate-lanceolate acute sepals ; stamens about 

 20 ; style terminal, short, not thickened at the base ; 

 achenes smooth, or slightly rugose. 



Hudson Bay to Great Slave Lake. Also in arctic and 

 alpine Europe and Asia. Summer. 



