Potentilla ovina |
Potentilla furcata |
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sheep cinquefoil |
fork cinquefoil |
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Habit | Plants rosetted to ± matted; taproots sometimes ± fleshy-thickened. | |||||
Caudex branches | usually not sheathed with marcescent whole leaves. |
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Stems | prostrate to ascending, (0.3–)0.8–2(–3.5) dm, lengths (1–)1.5–3 times basal leaves. |
ascending to erect, (0.5–)1–3 dm. |
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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. |
often both ternate and palmate on same plant, sometimes subpalmate, 4–10 cm; petiole 2.5–8 cm, long hairs common to abundant, loosely appressed to ascending-spreading, 1–2 mm, weak to ± stiff, ± verrucose, short and/or crisped hairs sparse to abundant, cottony hairs absent, glands sparse to common; leaflets 3–5, proximalmost separated by 0(–2) mm, central oblong to obovate, 1.4–2.5(–5) × 0.6–1.3(–2) cm, petiolules 1–3(–5) mm, distal 2/3–3/4 of margin incised 1/2–3/4+ to midvein, teeth 3–5 per side, 3.5–6 mm, apical tufts 0.5–1 mm, abaxial surfaces grayish white to white, long hairs common to abundant, cottony-crisped hairs usually dense, short hairs and glands absent or obscured, adaxial green to grayish green, long hairs sparse to common, 0.5–1(–1.5) mm, ± stiff, short and/or crisped hairs sparse to common, sometimes abundant, cottony hairs absent, glands sparse to abundant. |
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Cauline leaves | 1–2. |
1–3. |
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Inflorescences | (1–)2–11(–20)-flowered, usually openly cymose. |
7–12(–20)-flowered, ± open, branch angle 5–30(–50)°. |
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Pedicels | (0.8–)1–2(–4) cm, straight to ± recurved in fruit. |
(0.5–)1–2 cm, proximal to 3 cm. |
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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 linear to narrowly lanceolate, 2–3.5 × 0.6–1 mm; hypanthium 2.5–3.5 mm diam.; sepals 2.5–4 mm, apex subacute to acute, glands ± common, usually not obscured; petals pale yellow, not overlapping, 3–5(–6) × 3–4(–5) mm, slightly longer than sepals; filaments 0.8–1.8 mm, anthers 0.4 mm; carpels 30–60, styles 0.7–0.9 mm. |
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Achenes | 1.5–2 mm, smooth, not carunculate. |
1.2 mm. |
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Potentilla ovina |
Potentilla furcata |
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Phenology | Flowering spring–summer. | |||||
Habitat | Sandy bluffs, dry riverbanks, limestone outcrops, grassy openings in dry forests, dry mountain slopes | |||||
Elevation | 100–2400 m (300–7900 ft) | |||||
Distribution |
CO; ID; MT; NV; OR; UT; WY; AB; BC
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AK; BC; YT |
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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.) |
Potentilla furcata is a characteristic species of the steppe bluffs of interior and south-central Alaska, Yukon, and northern British Columbia, mainly within the unglaciated Beringian region. It differs from P. rubricaulis in having less open inflorescences, smaller flowers, narrower petals, more papillae on styles, and denser glands on epicalyx and calyx. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 171. | FNA vol. 9, p. 208. | ||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Multijugae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Rubricaules | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | P. diversifolia var. pinnatisecta, P. pinnatisecta, P. plattensis var. pinnatisecta | P. hookeriana var. furcata, P. rubricaulis var. furcata | ||||
Name authority | J. M. Macoun: Canad. Rec. Sci. 6: 464. (1896) | A. E. Porsild: Bull. Natl. Mus. Canada 121: 224, plate 18. (1951) | ||||
Web links |