VOL. II.] 



ROSE FAMILY. 



215 



19. Potentilla multifida L. Cut-leaved 

 Cinquefoil. (Fig. 1931.) 



Potentilla rmdtifida L. Sp. PI. 496- 1753- 



Perennial, stems several or many from the caudex, 

 low, ascending or spreading, appressed-silky. Stip- 

 ules large, lanceolate, acuminate, scarious, brown; 

 leaves pinnately s-g-foliolate, grayish-tomentose be- 

 neath, 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 and the Northwest Territory. Also in 

 arctic and alpine Europe and Asia. Summer. 



20. Potentilla fruticosa L. Shrubby 

 Cinquefoil. (Fig. 1932.) 



Potentilla frulicosa L,. Sp. PI. 495. 1/53. 



Shrubby, much branched, stems erect or ascending, 

 very leafy, 6'-4 high, the bark shreddy. Stipules 

 ovate-lanceolate, membranous, acute or acuminate, en- 

 tire; leaflets 5-7, oblong, or somewhat oblanceolate, 

 entire, acute or acutish at each end, 6"-i2" long, silky- 

 pubescent, the margins revolute; flowers terminal, 

 densely cymose, or solitary, bright yellow, B // -i5 // 

 broad; petals nearly orbicular, exceeding the ovate 

 calyx-lobes and bractlets; stamens 15-20; style lateral, 

 filiform; achenes, disk and receptacle long-hairy. 



In swamps or moist rocky places, I^brador and Green- 

 land to Alaska, south to New Jersey, Illinois, Minnesota, 

 in the Rocky Mountains to Arizona, and in the Sierra Ne- 

 vada to California. Also in northern Europe and Asia. 

 Called also Hardhack and Prairie Weed. A troublesome 

 bushy weed in northern New England. June-Sept. 



21. Potentilla tridentata Soland. Three- 

 toothed Cinquefoil. (Fig. 1933.) 



Potentilla tridentata Soland. in Ait. Hort. Kew. 2: 216. 1789. 



Tufted, woody at the base, much branched, branches 

 erect, i / -i2 / high, pubescent with appressed hairs. Stip- 

 ules lanceolate, entire; leaves mostly petioled, 3-foliolate; 

 leaflets of the lower ones oblanceolate, 3-toothed or some- 

 times 2-5-toothed at the obtuse apex, cuneate at the base, 

 coriaceous, dark green and shining above, pale and mi- 

 nutely pubescent beneath, j'-i' long; upper leaflets lin- 

 ear or oblong, often acute and entire; flowers 1-6, in a ter- 

 minal cyme, white, 3 // -5 // broad; bractlets shorter and 

 narrower than the ovate acute calyx-lobes, which are 

 shorter than the obovate-oval petals; stamens about 20; 

 style lateral, filiform; achenes and receptacle villous. 



In rocky places, especially on mountains, Greenland to 

 New Jersey, on the higher southern Alleghanies, shores of 

 I,ake Superior, and west to the Canadian Rocky Mountains. 

 June-Aug. 



