10. Potentilla Argéntea L. Silvery Or Hoary Cinquefoil

Fig. 2236

Potentilla argentea L. Sp. Pl. 497. 1753.

Stems ascending, tufted, branched, slightly woody at the base, 4'-12' long, white woolly-pubescent. Stipules lanceolate, acuminate; leaves all but the uppermost petioled, digitately 5-foliolate; leaflets oblanceolate or obovate, obtuse at the apex, cuneate at the base, green and glabrous above, white-tomentose beneath, laciniate or incised and with revolute margins, 6"-12" long; flowers cymose, terminal, pedicelled, yellow, 2"-4" broad; calyx-lobes ovate, acutish, a little shorter than the obovate retuse petals; stamens about 20; style filiform; achenes glabrous.

In dry soil, Nova Scotia and Ontario to North Dakota, south to Washington. D. C, Indiana and Kansas. Also in Europe and Asia. May-Sept.

Potentilla collina Wibel, of Europe, collected at Winona, Minn., and Cambridge, Mass., differs in its more prostrate habit, broader and not revolute leaflets, and larger calyx.

II. Potentilla Intermedia L. Downy Cinque-Foil

Fig. 2237

Potentilla intermedia L. Mant. 1: 76. 1767.

Perennial, stem 1°-2 1/2° high, usually ascending, leafy and much branched, finely pubescent with long hairs. Leaves green and finely hirsute on both sides, somewhat tomentose beneath, all but the uppermost 5-foliolate, the lower long-petioled; stipules narrow, acute, mostly entire; leaflets obovate or oblong, the teeth rather obtuse; flowers numerous, cymose, yellow, leafy-bracted; petals obcordate, equalling the triangular-ovate acute sepals and oblong bractlets; stamens about 20; style short, not thickened at the base.

Waste grounds and roadsides, Massachusetts, New York and New Jersey to Michigan. Adventive from Europe. Resembles P. monspeliensis, differing in its 5-foliolate leaves, and perennial root.

Potentilla inclinàta Vill., introduced from Europe and established at Kingston, Ontario, and at Buffalo, New York, differs in having leaves grayish-silky beneath with oblanceolate leaflets (P. canescens Bess.).

12. Potentilla Recta L. Rough-Fruited Cinquefoil

Fig. 2238

Potentilla recta L. Sp. Pl. 497. 1753.

Potentilla sulphurea Lam. Fl. Franc. 3: 114. 1778.

Potentilla pilosa Willd. Sp. Pl. 2: 1109. 1799.

Erect, rather stout, branched above, villous-pu-bescent, 1°-2° high. Stipules ovate-lanceolate, the lower foliaceous and laciniate; leaves digitately 5-7-foliolate, all but the uppermost petioled; leaflets oblanceolate or oblong-lanceolate, obtuse at the apex, narrowed or cuneate at the base, green both sides, sparingly pubescent with scattered hairs above, more pubescent beneath, incised-dentate, 1'-3' long, with divergent teeth; flowers terminal, cymose, yellow, numerous, 6"-9" broad; stamens about 20; style slender, terminal; carpels rugose.

In waste places, Maine to Ontario, New York, Virginia and Michigan. Adventive from Europe. Native also of Asia. June-Sept.