Potentilla ovina |
Potentilla robbinsiana |
|||||
---|---|---|---|---|---|---|
sheep cinquefoil |
dwarf mountain cinquefoil, Robbins' cinquefoil, White Mountains cinquefoil |
|||||
Habit | Plants rosetted to ± matted; taproots sometimes ± fleshy-thickened. | Plants tufted to densely matted; caudex branches short, ± slender, often embedded in old leaf bases. | ||||
Stems | prostrate to ascending, (0.3–)0.8–2(–3.5) dm, lengths (1–)1.5–3 times basal leaves. |
spreading to erect, 0.1–0.4 dm, lengths 1–2 times basal leaves. |
||||
Basal leaves | pinnate with distal leaflets ± distinct, (1.5–)2–10(–13) × 0.7–3.5(–5) cm; petiole 0.5–3.5(–5) cm, straight hairs sparse to abundant, sometimes absent (var. decurrens), ± appressed to ascending, 1 mm, ± stiff, cottony hairs absent, glands sparse, often obscured; primary lateral leaflets 3–6 per side (often with additional interspersed leaflets), on distal 1/2–2/3(–3/4) of leaf axis, ± separate to ± overlapping, largest ones narrowly cuneate-oblanceolate to ± obovate, (0.3–)0.5–2(–3.5) × (0.2–)0.3–0.8(–1) cm, distal 1/4 to whole margin unevenly to pinnately (at least distal leaflets of var. ovina) incised 1/2–3/4+ to midvein, ultimate teeth 2–9(–11), linear or oblong to ovate, 1–7(–9) × 1–2 mm, apical tufts 0.5–2 mm, surfaces green to grayish, not glaucous, straight hairs sparse to abundant (sparser adaxially), sometimes absent (except on margins), loosely appressed, 0.5–2 mm, ± stiff, cottony hairs absent, crisped hairs sometimes sparse to common, glands absent or inconspicuous. |
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. |
||||
Cauline leaves | 1–2. |
|||||
Inflorescences | (1–)2–11(–20)-flowered, usually openly cymose. |
1(–2)-flowered. |
||||
Pedicels | (0.8–)1–2(–4) cm, straight to ± recurved in fruit. |
straight, 0.5–3 cm, not much longer in fruit than in flower. |
||||
Flowers | epicalyx bractlets linear-lanceolate to narrowly elliptic, sometimes doubled, 2–3.5(–5) × 1 mm; hypanthium 3–5 mm diam.; sepals 3.5–5.5(–7) mm, apex acute to obtuse; petals 4–7(–8) × 3.5–8 mm; filaments 1–2.5 mm, anthers 0.4–1 mm usually ± 1/2 as long as filaments; carpels 10–20, styles 2–3 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 | 1.5–2 mm, smooth, not carunculate. |
1–1.3 mm. |
||||
2n | = 49. |
|||||
Potentilla ovina |
Potentilla robbinsiana |
|||||
Phenology | Flowering summer. | |||||
Habitat | Moist rocky slopes and flats, in montane tundra | |||||
Elevation | 1400–1600 m (4600–5200 ft) | |||||
Distribution |
CO; ID; MT; NV; OR; UT; WY; AB; BC
|
NH; VT |
||||
Discussion | Varieties 2 (2 in the flora). Potentilla ovina is here accepted as an implicit new name by J. M. Macoun for P. diversifolia var. pinnatisecta, in agreement with N. H. Holmgren (1997b). In contrast, B. C. Johnston (1980) considered the names heterotypic. Potentilla ovina has priority at the species rank over P. pinnatisecta by one month. (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.) |
||||
Key |
|
|||||
Source | FNA vol. 9, p. 171. | FNA vol. 9, p. 194. | ||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Multijugae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Aureae | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | P. diversifolia var. pinnatisecta, P. pinnatisecta, P. plattensis var. pinnatisecta | P. minima var. robbinsiana, P. hyparctica subsp. robbinsiana | ||||
Name authority | J. M. Macoun: Canad. Rec. Sci. 6: 464. (1896) | (Lehmann) Oakes ex Rydberg: Bull. Torrey Bot. Club 23: 304. (1896) | ||||
Web links |