Potentilla wheeleri |
Potentilla robbinsiana |
|
---|---|---|
Kern cinquefoil, Wheeler's cinquefoil |
dwarf mountain cinquefoil, Robbins' cinquefoil, White Mountains cinquefoil |
|
Habit | Plants tufted to densely matted; caudex branches short, ± slender, often embedded in old leaf bases. | |
Stems | 0.2–2.5 dm. |
spreading to erect, 0.1–0.4 dm, lengths 1–2 times basal leaves. |
Basal leaves | palmate, 1.5–9.5 cm; petiole 1–7 cm, long hairs abundant to dense, spreading to appressed, 1–2 mm, weak to stiff, glands ± abundant; leaflets 5, central cuneate-elliptic to obovate, 0.5–2.5 × 0.3–1.5 cm, scarcely to distinctly petiolulate, distal 1/3 of margins evenly incised ± 1/4 to midvein, teeth 2–4(–5) per side, surfaces gray-green, long hairs abundant to dense, 1–1.5 mm, glands ± abundant, sometimes obscured. |
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 | 1–20-flowered. |
1(–2)-flowered. |
Pedicels | 0.5–1.5 cm. |
straight, 0.5–3 cm, not much longer in fruit than in flower. |
Flowers | epicalyx bractlets lanceolate to ovate-elliptic, 1–3.5 × 1–1.5 mm; hypanthium 2–4 mm diam.; sepals 2–5 mm, apex ± acute; petals ± paler abaxially, bright yellow adaxially, ± obcordate, 3–6 × 2–5 mm; filaments 1–2 mm, anthers 0.5 mm; carpels ca. 20, styles (1.2–)1.5–2 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 | 1–1.5 mm, lightly rugose. |
1–1.3 mm. |
Short | hairs not well differentiated from long hairs, absent or sparse throughout. |
|
2n | = 49. |
|
Potentilla wheeleri |
Potentilla robbinsiana |
|
Phenology | Flowering May–Sep. | Flowering summer. |
Habitat | Sandy flats, streamsides, lake margins, open conifer woodlands, alpine fellfields | Moist rocky slopes and flats, in montane tundra |
Elevation | 1800–3500 m (5900–11500 ft) | 1400–1600 m (4600–5200 ft) |
Distribution |
CA
|
NH; VT |
Discussion | Potentilla wheeleri is found in the southern Sierra Nevada and San Bernardino Mountains of southern California. Compact plants on the summit of Mount San Gorgonio, described by Jepson as var. paupercula, show no consistent difference to justify their taxonomic segregation. Variety viscidula Rydberg has been misapplied to Arizona populations now called P. rhyolitica. Plants identified as P. wheeleri (excluding P. rimicola) from the Sierra San Pedro Mártir (Baja California) stand as a distinct species, P. luteosericea Rydberg (= P. pinetorum Wiggins). (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. 185. | FNA vol. 9, p. 194. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Subviscosae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Aureae |
Sibling taxa | ||
Synonyms | P. wheeleri var. paupercula | P. minima var. robbinsiana, P. hyparctica subsp. robbinsiana |
Name authority | S. Watson: Proc. Amer. Acad. Arts 11: 148. (1876) | (Lehmann) Oakes ex Rydberg: Bull. Torrey Bot. Club 23: 304. (1896) |
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