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.

10 Potentilla Arg Ntea L Silvery Or Hoary Cinquefo 57810 Potentilla Arg Ntea L Silvery Or Hoary Cinquefo 579

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.

12 Potentilla Recta L Rough Fruited Cinquefoil 58012 Potentilla Recta L Rough Fruited Cinquefoil 581