Potentilla newberryi |
Potentilla bimundorum |
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Newberry's cinquefoil |
cutleaf cinquefoil, potentille des deux mondes, staghorn cinquefoil |
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Stems | decumbent to ascending, rarely erect, 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. |
subpinnate, 7–22(–25) cm; petiole 3–12(–15) cm, long hairs ± abundant, appressed to ascending, 0.5–3 mm, stiff, short hairs absent, cottony or crisped hairs absent, glands absent or sparse; leaflets 3(–4) per side, on distal 1/5–1/3(–1/2) of leaf axis, overlapping or not, terminal ones oblong to broadly oblong, 1.5–5 × 0.7–2 cm, margins strongly revolute, incised nearly to midvein, undivided medial blade 1–3 mm wide, teeth (3–)4–5 per side, linear, rarely narrowly oblong to narrowly lanceolate, surfaces strongly dissimilar, abaxial white or grayish white, long hairs abundant, ± 1 mm, stiff verrucose on veins, sparse and soft between veins, short hairs absent, crisped and cottony hairs dense, glands absent, adaxial dark green, long hairs sparse to common, tightly appressed, 0.5–1 mm, short hairs absent, cottony and crisped hairs absent, glands absent or sparse. |
Cauline leaves | (1–)2–3. |
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Inflorescences | (5–)10–40+-flowered, ± congested to open. |
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Pedicels | 0.3–1 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 narrowly oblong-lanceolate, 3–5 × 0.9–1.3 mm, lengths ± 3/4 times sepals, margins flat; hypanthium 2.5–3.5 mm diam.; sepals 4–7(–8) mm, apex acute to obtuse, abaxial surfaces: venation prominent at least proximally, glands ± sparse, obscured to evident; petals pale yellow, 3.5–5 × 3–5 mm, lengths ± equal to sepals; filaments 0.5–1.5 mm, anthers 0.5–0.6 mm; carpels 40–60, styles papillate-swollen at very base, if at all, 0.8–0.9 mm. |
Achenes | 0.9–1.2 mm. |
1.3–1.5 mm, rugose. |
2n | = 28. |
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Potentilla newberryi |
Potentilla bimundorum |
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Phenology | Flowering summer. | Flowering summer. |
Habitat | Moist, sandy to clayey, more or less alkaline soil, especially where seasonally inundated near streams, ponds, and lakes | Road and railway verges, gravelly ruderal sites, acidic rocky outcrops, stream banks and gravel bars, sandy-gravelly flood plains, gravel ridges, sandy lakeshores, sandy steppe bluffs |
Elevation | 1300–1800 m (4300–5900 ft) | 0–1000 m (0–3300 ft) |
Distribution |
CA; NV; OR; WA
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AK; AB; MB; NT; NU; ON; QC; SK; YT; e Asia (Russian Far East) |
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.) |
Potentilla bimundorum is the correct name for what has been treated as P. multifida Linnaeus in North America. It is the only American representative of the mainly Eurasian P. multifida group, which is sometimes treated as a distinct section. J. Soják (2005) presented a useful survey and key to this group, showing that its species, in spite of being merged within P. multifida in the broad sense by many authors, are each distinct and with their own range. Potentilla multifida in the narrow sense is restricted to eastern Europe and western Siberia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 137. | FNA vol. 9, p. 218. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Arenicolae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Pensylvanicae |
Sibling taxa | ||
Synonyms | Ivesia gracilis | P. multifida subsp. bimundorum |
Name authority | A. Gray: Proc. Amer. Acad. Arts 6: 532. (1865) — not P. gracilis Douglas ex Hooker 1830 | Soják: Č as. Nár. Muz. Praze Rada P ř ír. 141: 195. (1974) |
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