Potentilla newberryi |
Potentilla hookeriana |
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Newberry's cinquefoil |
graceful cinquefoil, Hooker's cinquefoil |
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Caudex branches | not sheathed with marcescent whole leaves. |
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Stems | ascending to nearly erect, (0.3–)0.5–2 dm. |
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Basal leaves | petiole 1–3.5 cm, long hairs ± abundant, 0.5–1.5 mm, short hairs absent or sparse, rarely common; leaflets 0.2–1 cm, lobes oblanceolate to narrowly elliptic, (0.5–)1–2 mm wide, longs hairs ± abundant, short hairs absent or sparse, glands sparse to abundant. |
usually both ternate and palmate on same plant, rarely subpalmate, 1–9 cm; petiole 0.5–6 cm, long hairs common to abundant, ± appressed to ascending-spreading, (0.5–)1–1.5(–2) mm, usually stiff, rarely weak, verrucose, short-crisped hairs sparse to common, cottony hairs absent, glands ± sparse; leaflets 3–5, proximalmost separated by 0(–1) mm, central oblanceolate to obovate, 0.5–2.5 × 0.4–1.2 cm, petiolules 0–1 mm, distal ± 3/4 of margin incised 1/2–3/4, rarely +, to midvein, teeth 2–6 per side, 1–5 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, 0.5–1.5 mm, usually stiff, short and/or crisped hairs sparse to common, cottony hairs absent, glands sparse to common. |
Cauline leaves | 1–2. |
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Inflorescences | 1–6(–8)-flowered, open, branch angle 20–50°. |
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Pedicels | (0.5–)1–2 cm, proximal to 3 cm. |
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Flowers | epicalyx bractlets broadly lanceolate to elliptic, 1.5–4(–5) × (0.4–)0.8–1.3 mm; sepals 2–4(–5) mm, apex ± acute; petals (3–)4–6 × (2–)3–5 mm; filaments 1–2(–2.5) mm, anthers 0.4–0.6 mm; carpels 20–50. |
epicalyx bractlets linear to oblong-lanceolate, 2–3 × 0.7–1.3 mm; hypanthium 3–4 mm diam.; sepals 3–5 mm, apex subacute, glands ± common, not obscured; petals yellow, ± overlapping, 3–6(–7) × 4–5 mm, usually longer than sepals; filaments 0.5–1.5 mm, anthers 0.3–0.5 mm; carpels 30–50, styles 0.8–1.2 mm. |
Achenes | 0.9–1.2 mm. |
1–1.3 mm. |
Potentilla newberryi |
Potentilla hookeriana |
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Phenology | Flowering summer. | Flowering (spring–)summer. |
Habitat | Moist, sandy to clayey, more or less alkaline soil, especially where seasonally inundated near streams, ponds, and lakes | Alpine ridges, fellfields, scree slopes, rocky canyons |
Elevation | 1300–1800 m (4300–5900 ft) | 1400–3900 m (4600–12800 ft) |
Distribution |
CA; NV; OR; WA
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CO; ID; MT; NV; UT; WY; AB; BC |
Discussion | Potentilla newberryi grows in valley bottoms in south-central Oregon, northeastern California, and northwestern Nevada. The only specimen supposedly collected in south-central Washington (W. N. Suksdorf 2718, WTU) was gathered in 1898. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
As here defined, Potentilla hookeriana consists of primarily alpine plants from the Rocky Mountains and adjacent desert mountains that share many of the same characters with P. rubricaulis but are smaller overall. Arctic plants previously included in P. hookeriana are now assigned to P. arenosa (J. Soják 1986; B. Ertter et al. 2013). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 137. | FNA vol. 9, p. 208. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Arenicolae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Rubricaules |
Sibling taxa | ||
Synonyms | Ivesia gracilis | P. nivea subsp. hookeriana, P. nivea var. hookeriana |
Name authority | A. Gray: Proc. Amer. Acad. Arts 6: 532. (1865) — not P. gracilis Douglas ex Hooker 1830 | Lehmann: Index Seminum (Hamburg) 1849: 10. (1849) |
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