Potentilla flabellifolia |
Potentilla thuringiaca |
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fan-foil, fan-leaf cinquefoil, fanleaf or fanfoil or Mount Rainier cinquefoil, fringe-leaf cinquefoil, high mountain cinquefoil |
European cinquefoil, German cinquefoil, potentille de thuringe |
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Habit | Plants ± openly matted; caudex branches short to elongate, ± stout. | |
Glands | sparse, uncolored, minute. |
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Stems | ascending to erect, (0.3–)1–3 dm, lengths 2 times basal leaves. |
1.5–5(–7) dm. |
Basal leaves | 2-ranked, ternate, (1–)3–12(–20) cm; stipules: apex rounded; petiole (0.5–)1–15(–18) cm, hairs and glands usually absent; leaflets 3, central widely obovate to flabellate, (0.5–)1–5 × (0.4–)1–3(–3.5) cm, petiolule 0–5(–10) mm, margins flat, not or shallowly lobed (sinuses extending less than 1/2 to midvein), distal 1/2–3/4 usually unevenly incised 1/4–1/2 to midvein, teeth 3–7 per side, often secondarily toothed, surfaces similar, green, hairs absent or sparse, rarely common, 0.5–1 mm, glands absent or sparse. |
4–25(–35) cm; petiole 2–20(–25) cm, hairs sparse to common, ± spreading, 1–2.5 mm, weak, glands absent or sparse; leaflets 5–7(–9), central one narrowly to broadly oblanceolate, 1–6(–9) × 0.5–2 cm, distal 2/3–3/4+ of margin incised 1/4–1/3(–1/2) to midvein, teeth (4–)6–10(–13) per side, surfaces ± similar, abaxial green to pale green, hairs sparse to common on primary veins, ascending to spreading, 0.5–1.5 mm, weak, adaxial green, hairs more appressed and shorter. |
Cauline leaves | 1–3; stipules fused with less than 1/3 of petiole, free portion longer than fused portion. |
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Inflorescences | 1–6-flowered. |
5–20-flowered. |
Pedicels | straight, 0.3–4.5(–5) cm, not much longer in fruit than in flower. |
1–3 cm (proximalmost to 5 cm). |
Flowers | epicalyx bractlets often toothed or 2-lobed, elliptic to oval, 3.5–7 × (1–)1.5–3 mm, margins flat; hypanthium 3–7 mm diam.; sepals 4–8 mm, apex acute to obtuse; petals dark yellow, (5–)6–10(–12) × (3–)5–10 mm; filaments 1.5–3 mm, anthers 0.6–1.5 mm; carpels 20–50, styles filiform, not or slightly papillate-swollen proximally, 1.6–2.5 mm. |
epicalyx bractlets linear to lanceolate, 3–8 × 1–1.5(–2) mm; hypanthium 3–5 mm diam.; sepals 3–5 mm, apex ± acute; petals (5–)8–10 × 4–10 mm; filaments 0.3–1.5 mm, anthers 0.7–0.9 mm; carpels 35–50, styles 1.1–1.3 mm. |
Achenes | 1.2–1.5 mm. |
1–1.2 mm, faintly rugose. |
2n | = 28. |
= 42, 56 (Eurasia). |
Potentilla flabellifolia |
Potentilla thuringiaca |
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Phenology | Flowering summer. | Flowering late spring–summer. |
Habitat | Moist to wet or swampy, sometimes dry, stream banks, lakeshores, meadows, in conifer woodlands, subalpine and alpine grassy, rocky slopes, near or above timberline | Edges of and openings in hardwood and conifer woodlands |
Elevation | 1000–3700 m (3300–12100 ft) | 0–100 m (0–300 ft) |
Distribution |
CA; ID; MT; NV; OR; WA; WY; AB; BC
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RI; QC; Eurasia [Introduced in North America] |
Discussion | Potentilla flabellifolia is found in the mountains from southern British Columbia, southwestern Alberta, and southwestern Montana to the southern Sierra Nevada of California. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Potentilla thuringiaca might be mistaken for the more widely established P. intermedia of sect. Terminales. In addition to having flowering stems lateral to persistent basal leaves, P. thuringiaca has much larger petals (mostly 8–10 mm versus 4–5 mm), 5–9 leaflets, and tubercles at the bases of the long, spreading hairs. To the Quebec records (and subsequent collections) reported by R. Cayouette (1966) is added Block Island, Rhode Island (Fernald et al. 9650, GH). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 190. | FNA vol. 9, p. 146. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Aureae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Chrysanthae |
Sibling taxa | ||
Synonyms | P. chrysantha subsp. thuringiaca, P. goldbachii, P. nestleriana | |
Name authority | Hooker ex Torrey & A. Gray: Fl. N. Amer. 1: 442. (1840) | Bernhardi ex Link: Enum. Hort. Berol. Alt. 2: 64. (1822) |
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