Potentilla subviscosa |
Potentilla subgorodkovii |
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Mogollon cinquefoil, Navajo cinquefoil |
Beringian cinquefoil, yurtsev's cinquefoil |
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Habit | Plants ± densely tufted. | |||||
Caudex branches | stout, usually columnar, sometimes sheathed with marcescent whole leaves. |
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Stems | 0.2–1.5(–2) dm. |
erect, (0.2–)0.3–1.5(–2) dm, lengths 1.5–2.5(–3.5) times basal leaves. |
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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. |
(1–)2–10(–15) cm; petiole (0.5–)1–5(–12) cm, long hairs common to dense, ± ascending to loosely appressed, sometimes spreading, 1–2 mm, ± soft, smooth, crisped/short-cottony hairs usually sparse, sometimes absent or common, glands absent, sparse, or obscured; leaflets separate to slightly overlapping, central obovate or obtriangular, (0.5–)1–2(–3) × (0.4–)0.8–1.5(–2) cm, sessile or subsessile, base cuneate, margins revolute, distal (1/3–)1/2–2/3(–3/4) incised 1/2–2/3(–3/4) to midvein, teeth 2–3(–4) per side, usually ± distant, surfaces somewhat to more often strongly dissimilar, abaxial yellowish or grayish white to white, long hairs 0.8–1.5 mm, cottony-crisped hairs ± dense, adaxial green to grayish green, long hairs sparse to ± abundant, other hairs usually absent. |
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Cauline leaves | (0–)1(–2). |
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Inflorescences | (1–)3–15-flowered. |
usually 1(–2)-flowered, rarely to 5-flowered. |
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Pedicels | 0.5–1.5(–2) cm. |
(0.5–)2–4 cm in flower, to 5 cm in fruit. |
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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 elliptic-lanceolate to ovate, (3–)4–6(–7) × (0.8–)1.2–2(–2.5) mm, (1/2–)2/3 to as wide as sepals, margins revolute, rarely flat, red glands absent; hypanthium 2.5–4 mm diam.; sepals 4–6(–7) mm, apex subacute; petals (5–)6–9 × (5–)7–9 mm, significantly longer than sepals; filaments 1–1.3 mm, anthers 0.4–0.6 mm; carpels 30–40, apical hairs absent, styles narrowly columnar to conic-tapered, papillate-swollen on proximal 1/5(–1/3), 0.9–1.1 mm. |
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Achenes | 1.5–2 mm, ± rugose. |
1.2–2 mm. |
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Short | hairs well differentiated from long hairs, ± abundant to dense throughout. |
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2n | = 28, 42, 49, 56 (Russian Far East). |
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Potentilla subviscosa |
Potentilla subgorodkovii |
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Phenology | Flowering late spring to summer. | |||||
Habitat | Dry alpine heaths, exposed ridges and summits, rock outcrops, scree and talus, dry tundra, acidic and calcareous bedrock | |||||
Elevation | 0–4300 m (0–14100 ft) | |||||
Distribution |
AZ; CO; NM
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AK; CO; MT; UT; WY; AB; BC; NT; NU; YT; Asia (Russian Far East, Sakha [Yakutia]) |
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The name Potentilla subgorodkovii was coined for a presumed hybrid species resulting from P. crebridens × P. subvahliana; here it is applied in a collective meaning for plants combining characteristics from multiple species of the P. uniflora/villosa and P. nivea groups. Morphologically, this collective entity is much closer to the P. uniflora/villosa group than to the P. nivea group and is clearly different from primary hybrids and clones, which are often observed. Potentilla subgorodkovii constitutes about half of what previously has been considered P. uniflora in Alaska and Yukon and is the only such entity fully confirmed south of northern British Columbia. These southern populations occur outside the range of possible parental members of the P. uniflora/villosa group and do not support the hybrid hypothesis. They may instead represent a distinct species, not yet described. (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. 204. | ||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Subviscosae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Niveae | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Greene: Bull. Torrey Bot. Club 8: 97. (1881) | Jurtzev: Bot. Zhurn. (Moscow & Leningrad) 78: 83. (1993) | ||||
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