Potentilla ovina |
Potentilla stipularis |
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sheep cinquefoil |
stipulate cinquefoil, stipulated cinquefoil |
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Habit | Plants rosetted to ± matted; taproots sometimes ± fleshy-thickened. | |||||
Glands | mostly absent. |
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Stems | prostrate to ascending, (0.3–)0.8–2(–3.5) dm, lengths (1–)1.5–3 times basal leaves. |
(0.2–)1–2.5(–3.5) 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. |
3–7(–10) cm; petiole 2–5(–7.5) cm, hairs absent or sparse, appressed to spreading, 0.5–0.8 mm, stiff, glands absent or nearly so; leaflets 7–11, central one oblanceolate-elliptic, 1–2(–3) × 0.3–0.8 cm, distal 1/4 or less of margin incised less than 1/10(–1/4) to midvein, teeth 1–2(–5) per side, surfaces similar, abaxial pale green to reddish, often glaucous, hairs absent or sparse to common on primary veins, appressed to ascending, 0.6–1 mm, stiff, adaxial green or reddish, glabrous or nearly so. |
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Cauline leaves | 1–2. |
1–3; stipules fused with all or most of petiole, free portion shorter than fused portion. |
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Inflorescences | (1–)2–11(–20)-flowered, usually openly cymose. |
2–5-flowered. |
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Pedicels | (0.8–)1–2(–4) cm, straight to ± recurved in fruit. |
1–3 cm (proximalmost to 6 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 lanceolate to narrowly lanceolate, 3–5 × 0.7–1(–1.5) mm; hypanthium 2.5–3 mm diam.; sepals 4–6 mm, apex acute; petals (4–)6–8 × 4–6 mm; filaments 1.6–2 mm, anthers 0.4–0.6 mm; carpels 40–50, styles 0.7–0.9 mm. |
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Achenes | 1.5–2 mm, smooth, not carunculate. |
1.1–1.3 mm, smooth. |
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2n | = 28 (Eurasia). |
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Potentilla ovina |
Potentilla stipularis |
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Phenology | Flowering summer. | |||||
Habitat | Herb meadows, alluvial meadows and flats, open shrub thickets, Salix-Dryas tundra | |||||
Elevation | 10–600 m (0–2000 ft) | |||||
Distribution |
CO; ID; MT; NV; OR; UT; WY; AB; BC
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AK; Greenland; Eurasia |
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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.) |
The occurrences of Potentilla stipularis in Alaska are a continuation of the range from Asia. The six known occurrences in eastern and northeastern Greenland are disjunct (A. E. Porsild 1964) and were assigned to var. groenlandica by Sørensen, differing from Asian and Alaskan counterparts mainly in quantitative features: 9–11 leaflets, 7–11 teeth per leaflet, and not conspicuously glaucous (G. Halliday, pers. comm.). Here var. groenlandica is considered a high-arctic ecotype that provisionally is not accepted taxonomically. (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. 147. | ||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Multijugae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Chrysanthae | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | P. diversifolia var. pinnatisecta, P. pinnatisecta, P. plattensis var. pinnatisecta | P. stipularis var. groenlandica | ||||
Name authority | J. M. Macoun: Canad. Rec. Sci. 6: 464. (1896) | Linnaeus: Sp. Pl. 1: 498. (1753) | ||||
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