Potentilla flabellifolia |
Potentilla robbinsiana |
|
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fan-foil, fan-leaf cinquefoil, fanleaf or fanfoil or Mount Rainier cinquefoil, fringe-leaf cinquefoil, high mountain cinquefoil |
dwarf mountain cinquefoil, Robbins' cinquefoil, White Mountains cinquefoil |
|
Habit | Plants ± openly matted; caudex branches short to elongate, ± stout. | Plants tufted to densely matted; caudex branches short, ± slender, often embedded in old leaf bases. |
Stems | ascending to erect, (0.3–)1–3 dm, lengths 2 times basal leaves. |
spreading to erect, 0.1–0.4 dm, lengths 1–2 times basal leaves. |
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. |
not in ranks, ternate, 1–2 cm; stipules: apex broadly acute; petiole 0.7–3 cm, long hairs sparse to abundant, spreading to subappresed, 0.2–2 mm, weak, glands sparse to common; leaflets 3, central obovate, 0.5–1.3 × 0.2–1 cm, petiolule 0–1 mm, margins flat to ± revolute, not lobed, distal ± 2/3 evenly incised ± 1/2 to midvein, teeth 2–4(–5) per side, surfaces similar, green, hairs ± abundant (or nearly absent adaxially), 0.5–1 mm, glands sparse to common. |
Inflorescences | 1–6-flowered. |
1(–2)-flowered. |
Pedicels | straight, 0.3–4.5(–5) cm, not much longer in fruit than in flower. |
straight, 0.5–3 cm, not much longer in fruit than in flower. |
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 oblong to elliptic, (1.8–)2–2.5(–3) × 0.7–1.2(–1.4) mm, ± equal to sepals, margins flat to ± revolute; hypanthium (4–)5–7 mm diam.; sepals (1.8–)2–2.5(–3) mm, apex broadly acute; petals yellow, 2–3 × 2–3 mm; filaments 0.5–1 mm, anthers 0.4–0.6 mm; carpels 20–30, styles columnar-tapered, sometimes ± papillate-swollen in proximal 1/3–1/2, 0.8–1 mm. |
Achenes | 1.2–1.5 mm. |
1–1.3 mm. |
2n | = 28. |
= 49. |
Potentilla flabellifolia |
Potentilla robbinsiana |
|
Phenology | Flowering summer. | Flowering 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 | Moist rocky slopes and flats, in montane tundra |
Elevation | 1000–3700 m (3300–12100 ft) | 1400–1600 m (4600–5200 ft) |
Distribution |
CA; ID; MT; NV; OR; WA; WY; AB; BC
|
NH; VT |
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.) |
Of conservation concern. Potentilla robbinsiana is known only from two sites in the White Mountains, Monroe County, New Hampshire, and is reported in Vermont. Additional populations have been established nearby as a result of transplant efforts. Listed in 1980 as a federally endangered species, an intense recovery program resulted in the species being delisted in 2002. Some early specimens were distributed as Potentilla frigida Villars, a similar European species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 190. | FNA vol. 9, p. 194. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Aureae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Aureae |
Sibling taxa | ||
Synonyms | P. minima var. robbinsiana, P. hyparctica subsp. robbinsiana | |
Name authority | Hooker ex Torrey & A. Gray: Fl. N. Amer. 1: 442. (1840) | (Lehmann) Oakes ex Rydberg: Bull. Torrey Bot. Club 23: 304. (1896) |
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