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FNA | Family List | FNA Vol. 9 | Rosaceae | Potentilla

17. Potentilla intermedia Linnaeus, Syst. Nat. ed. 12. 2: 351. 1767; Mant. Pl. 1: 76. 1767.

Downy cinquefoil, potentille intermédiaire

Potentilla heidenreichii Zimmeter

Stems ascending to erect, 2–5 dm. Basal leaves palmate or ternate. Cauline leaves 3–8, proximal ones (3–)5–14 cm; proximal petioles (1–)2–10 cm, long hairs sparse to common, spreading to loosely appressed, 1–2 mm, weak, short or crisped hairs sparse to common, cottony hairs absent, glands absent or sparse; leaflets usually 5, central one oblanceolate to obovate, 2–4.5 × 1–2.5 cm, margins ± flat, distal 3/4+ usually unevenly, sometimes evenly, incised 1/3–2/3 to midvein (often with 1–2 incisions nearly to midvein), teeth 5–10 per side, surfaces similar or ± dissimilar, abaxial green to grayish green, long hairs sparse to common (especially on veins), 0.5–1.5 mm, soft to weak, short or crisped hairs ± sparse, cottony hairs absent, glands absent or sparse, adaxial long hairs absent or sparse, 1 mm, short hairs absent or sparse, crisped and cottony hairs absent, glands absent or sparse. Inflorescences 20–100+-flowered. Pedicels 0.5–1.5(–2.5) cm. Flowers: epicalyx bractlets lanceolate to ovate or elliptic, 2–5 × 0.8–1.5 mm, lengths usually 2/3, sometimes 1, times sepals; sepals 3.5–6.5 mm, apex ± acute; petals 3–5 × 2–3 mm; filaments 0.8–2 mm, anthers 0.3–0.5 mm; carpels 40–70, styles 1–1.2 mm, scarcely papillate-swollen proximally. Achenes 1 mm, rugose. 2n = 28, 56 (Eurasia).

Flowering late spring–summer. Dry waste places along roadsides, ditches, other open sites, in grasslands, oak and conifer woodlands; 0–300 m; introduced; St. Pierre and Miquelon; N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que.; Conn., Ind., Iowa, Maine, Mass., Mich., N.H., N.J., N.Y., Ohio, Pa., R.I., Vt., Wis.; Eurasia.

Potentilla intermedia is more common than P. inclinata at least in eastern Canada and New England.


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