Genus 7. 



ROSE FAMILY. 



257 



20. Potentilla bipinnatifida Dougl. Plains 

 Cinquefoil. Fig. 2246. 



P. bipinnatifida Dougl. ; Hook. Fl. Bor. Am. I : 188. 

 1833. 



P. pcnnsylvanica bipinnatifida T. & G. Fl. N. Am. i : 

 438. 1840. 



Perennial ; stems several, erect or ascending, 

 usually simple, leafy, finely white-villous, i°-ii° 

 high. Leaves pinnate, with ovate or lanceolate 

 stipules often li' long; leaflets 7-9, obovate in 

 outline, pectinately deeply divided into linear or 

 linear-oblong obtuse segments, finely silky above, 

 white-tomentose beneath ; calyx white-silky, 4" 

 broad in fruit, its lobes ovate, 2"-2J" long; bract- 

 lets oblong-lanceolate, shorter than the calyx- V( 

 lobes; stamens about 20; style glandular-thickened 

 at the base. 



Plains and hills, Minnesota to Manitoba, Alberta 

 and Colorado. Summer. 



21. Potentilla pectinata Raf. 

 Cinquefoil. Fig. 2247. 



Coast 



Potentilla pectinata Raf. Aut. Bot. 164. 1840. 



P. littoralis Rydberg, Bull. Torr. Qub 23 : 264, 1896 



Perennial, tufted, stems ascending or decum- 

 bent, branched above, 6'-2° high, appressed-silky, 

 or glabrate. Stipules ovate-lanceolate, cleft or 

 entire, acute ; basal and lower leaves petioled, 

 pinnately 5-7-foHolate, the leaflets approximate 

 or apparently digitate ; leaflets oblanceolate or 

 obovate, incised-pinnatifid into oblong obtuse 

 segments, grayish-pubescent beneath, green and 

 glabrate above, ¥-2¥ long ; flowers yellow, 

 cymose, 4"-s" broad ; petals obovate, equalling or 

 slightly exceeding the ovate acute veined sepals 

 and the lanceolate bractlets ; stamens 20-25 ; style 

 thickened below ; achenes glabrous. 



Coast of Newfoundland and Labrador to Hudson 

 Bay, Quebec and New Hampshire. June-July. 



22. Potentilla pcnnsylvanica L. Prairie 

 Cinquefoil. Fig. 2248. 



Potentilla pcnnsylvanica L. Mant. 76. 1767. 



P. pcnnsylvanica strigosa Pursh, Fl. Am. Sept. 356. 1814. 



P. strigosa Pall. ; Tratt. Ros. Monog. 4:31. 1824. 



Stem generally erect, i5'-3o' high, tomentose and 

 more or less villous. Stipules ovate, often much 

 divided; leaves pinnately 5-iS-foliolate, grayish 

 tomentose beneath, glabrous above; leaflets oblong 

 or oblanceolate, cleft halfway to the midrib into 

 oblong lobes, margins scarcely revolute ; cymes dense, 

 th,e branches erect ; petals yellow, obovate, truncate 

 or slightly emarginate, about equalling the ovate 

 triangular acute sepals and the lanceolate bractlets ; 

 stamens 20-25; style thickened below; achenes gla- 

 brous. 



On plains, Hudson Bay to the Yukon, British Colum- 

 bia, Kansas and New Mexico. Summer. 



17 



