19. Potentilla Multifida L. Cut-Leaved Cinquefoil

Fig. 2245

Potentilla multifida L. Sp. Pl. 496. 1753.

Perennial, stems several or many from the caudex, low, asceding or spreading, appressed-silky. Stipules large, lanceolate, acuminate, scarious, brown; leaves pinnately 5-9-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 exceeding 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.

20. Potentilla Bipinnatifida Dougl. Plains Cinquefoil

Fig. 2246

P. bipinnatifida Dougl.; Hook. Fl. Bor. Am. 1: 188. 1833.

P. pennsylvanica bipinnatifida T. & G. Fl. N. Am. 1: 438. 1840.

Perennial; stems several, erect or ascending, usually simple, leafy, finely white-villous, 1° - 1 1/2° high. Leaves pinnate, with ovate or lanceolate stipules often 1 1/2' 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" - 2 1/2" long; bract-lets oblong-lanceolate, shorter than the calyx-lobes; stamens about 20; style glandular-thickened at the base.

Plains and hills, Minnesota to Manitoba, Alberta and Colorado. Summer.

21. Potentilla Pectinàta Raf. Coast Cinquefoil

Fig. 2247

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

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

Perennial, tufted, stems ascending or decumbent, branched above, 6-2° high, appressed-silky, or glabrate. Stipules ovate-lanceolate, cleft or entire, acute; basal and lower leaves petioled, pinnately 5-7-foliolate, the leaflets approximate or apparently digitate; leaflets oblanceolate or obovate, incised-pinnatifid into oblong obtuse segments, grayish-pubescent beneath, green and glabrate above, 1/2'-2 1/2' long; flowers yellow, cymose, 4"-5" 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 Bav. Quebec and New Hampshire. June-July.

22. Potentilla Pennsylvánica L. Prairie Cinquefoil

Fig. 2248

Potentilla pennsylvanica L. Mant. 76. 1767.

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

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

Stem generally erect, 15' - 30' high, tomentose and more or less villous. Stipules ovate, often much divided; leaves pinnately 5 - 15 - foliolate, grayish tomentose beneath, glabrous above; leaflets oblong or oblanceolate, cleft halfway to the midrib into oblong lobes, margins scarcely revolute; cymes dense, the 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 glabrous.

On plains, Hudson Bay to the Yukon, British Columbia, Kansas and New Mexico. Summer.