Potentilla newberryi |
Potentilla albiflora |
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Newberry's cinquefoil |
Pinaleño cinquefoil, whiteflower cinquefoil |
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Stems | 0.2–1.5 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. |
ternate, 1.5–10 cm; petiole 1–7 cm, long hairs ± abundant, spreading to ascending, 0.5–1(–1.5) mm, weak to stiff, glands sparse to abundant; leaflets 3, central obovate, 0.5–2.5(–3.5) × 0.4–1.3(–2) cm, not to scarcely petiolulate, distal 1/2–2/3 of margins evenly incised ± 1/3 to midvein, teeth 3–5(–6) per side, surfaces green, long hairs ± abundant, 0.5–1 mm, glands sparse to abundant. |
Inflorescences | 1–5(–10)-flowered. |
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Pedicels | 0.5–2 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 lanceolate-elliptic, (1.5–)2–3(–5) × 0.5–1.5 mm; hypanthium 3.5–6 mm diam.; sepals 3–6(–8) mm, apex acute; petals ± paler abaxially, bright yellow adaxially, narrowly obcordate, (3–)4–7(–8) × 3–5 mm; filaments 2–4 mm, anthers 0.5–1 mm; carpels 10–25, styles 2–3 mm. |
Achenes | 0.9–1.2 mm. |
1.5 mm, smooth. |
Short | hairs not well differentiated from long hairs, absent or sparse throughout. |
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Potentilla newberryi |
Potentilla albiflora |
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Phenology | Flowering summer. | Flowering May–Sep. |
Habitat | Moist, sandy to clayey, more or less alkaline soil, especially where seasonally inundated near streams, ponds, and lakes | Rocky slopes, open ground, in pine-oak and mixed conifer woodlands |
Elevation | 1300–1800 m (4300–5900 ft) | 1800–3200 m (5900–10500 ft) |
Distribution |
CA; NV; OR; WA
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AZ |
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.) |
Of conservation concern. Potentilla albiflora grows on the Pinaleño (Graham) Mountains in Graham County, with a few outlying collections known from the Mogollon Rim in Greenlee County and the Santa Catalina Mountains of Pima County. Contrary to the specific epithet, petals of living plants are yellow, not white; like those of many Potentilla species, they tend to fade in pressed material. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 137. | FNA vol. 9, p. 186. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Arenicolae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Subviscosae |
Sibling taxa | ||
Synonyms | Ivesia gracilis | |
Name authority | A. Gray: Proc. Amer. Acad. Arts 6: 532. (1865) — not P. gracilis Douglas ex Hooker 1830 | L. O. Williams: Bull. Torrey Bot. Club 61: 260. (1934) |
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