Potentilla subviscosa |
Potentilla biflora |
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Mogollon cinquefoil, Navajo cinquefoil |
two-flower cinquefoil |
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Stems | 0.2–1.5(–2) dm. |
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Basal leaves | palmate, rarely ternate, (1–)2–7(–18) cm; petiole (0.5–)1–5(–11) cm, long hairs sparse to abundant, ± spreading (to ascending), 1–3(–4) mm, ± weak, glands ± abundant; leaflets (3–)5(–7), central flabellate to obovate-cuneate or oblanceolate, (0.5–)1–3(–8) × 0.5–2 cm, not or ± petiolulate, distal 2/3–3/4 of margins evenly to unevenly incised 1/5–3/4 to midvein, sometimes deeply lobed as well, teeth 2–9 per side (some secondarily toothed as well), surfaces green, long hairs sparse to common, 1–2 mm (late-season leaves and adaxial surfaces sometimes nearly glabrate), glands sparse to abundant. |
petiole 1–4 cm, long hairs absent or sparse, 1.5–2 mm, crisped hairs absent or sparse; leaflet lobes linear, 10–20 × 1–2 mm, surfaces with long hairs sparse or absent. |
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Inflorescences | (1–)3–15-flowered. |
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Pedicels | 0.5–1.5(–2) cm. |
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Flowers | epicalyx bractlets lanceolate-elliptic, 1.5–3(–5) × 0.5–1.5 mm; hypanthium 2.5–4 mm diam.; sepals (2.5–)3–5(–6) mm, apex ± acute; petals nearly white abaxially, pale yellow adaxially, narrowly obcordate, 3–6(–8) × 2.5–5 mm; filaments 1.5–2.5 mm, anthers 0.5–1 mm; carpels 4–12, styles 2–3 mm. |
epicalyx bractlets oblong, ovate, or lanceolate, 2.5–4 × 0.4–1.3 mm; sepals 3.5–5 mm, apex acute to apiculate; petals 6–10 × 4–10 mm; filaments 2.8–4 mm, anthers 0.6 mm; carpels 15–25. |
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Achenes | 1.5–2 mm, ± rugose. |
1.5–2 mm. |
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Short | hairs well differentiated from long hairs, ± abundant to dense throughout. |
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2n | = 14. |
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Potentilla subviscosa |
Potentilla biflora |
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Phenology | Flowering summer. | |||||
Habitat | Dryas fellfields, gravel terraces, well-drained soil, often with seasonal seepage, on calcareous substrates | |||||
Elevation | 0–2000 m (0–6600 ft) | |||||
Distribution |
AZ; CO; NM
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AK; BC; NT; NU; YT; Asia |
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
In North America, Potentilla biflora is mostly Beringian, barely reaching northern British Columbia and western Northwest Territories, with one locality in Nunavut (southern Victoria Island). The amphi-Beringian range is strongly isolated from other Asian populations, the closest being in the Altai Mountains of south-central Siberia. Two varieties are accepted in China (Li C. L. et al. 2003c), with North American plants falling in var. biflora. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 184. | FNA vol. 9, p. 131. | ||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Subviscosae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Biflorae | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Greene: Bull. Torrey Bot. Club 8: 97. (1881) | D. F. K. Schlechtendal: Ges. Naturf. Freunde Berlin Mag. Neuesten Entdeck. Gesammten Naturk. 7: 297. (1816) | ||||
Web links |