Potentilla newberryi |
Potentilla morefieldii |
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Newberry's cinquefoil |
Morefield's cinquefoil |
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Stems | 0.4–1.5(–1.7) dm, lengths 2–3 times basal leaves. |
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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. |
pinnate, usually at least 2 pairs of leaflets separate from terminal leaflets, distal leaflets usually distinct, 2–6 cm; petiole 0.2–1.5 cm, straight hairs abundant, ± appressed, 1–1.5 mm, stiff, cottony hairs absent, glands absent or sparse; leaflets 5–9, on distal (1/4–)1/2–3/4+ of leaf axis, overlapping, proximal pair separated from others by 2–10 mm of leaf axis, central leaflets oblanceolate to narrowly obovate, (0.5–)1–2(–2.5) × 0.5–1.2 cm, petiolules 0–1 mm, distal 3/4 of margins incised 3/4 to midvein (sometimes medially cleft as well), teeth 3–4 per side, separate to slightly overlapping, (1–)2–5 mm, surfaces ± to strongly dissimilar, abaxial grayish to white, straight hairs ± abundant, ± appressed, 1 mm, weak to stiff (especially on veins), cottony hairs abundant to dense, glands absent or obscured, adaxial greenish to grayish, straight hairs ± abundant, appressed, 0.5–1.5 mm, stiff, cottony hairs absent, rarely sparse, glands sparse. |
Inflorescences | 3–15-flowered. |
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Pedicels | 1–2.5(–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 ± ovate-elliptic, 2–4 × 0.8–2 mm; hypanthium 2.5–5 mm diam.; sepals 3.5–5 mm, apex ± acute; petals 4–6 × 3–5 mm; filaments 1–2 mm, anthers 0.5–1 mm; carpels 15–20, styles 2 mm. |
Achenes | 0.9–1.2 mm. |
1.5–2 mm, smooth to faintly rugose. |
Potentilla newberryi |
Potentilla morefieldii |
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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 | Alpine tundra and fellfields, mostly on dolomite substrates |
Elevation | 1300–1800 m (4300–5900 ft) | 3500–4000 m (11500–13100 ft) |
Distribution |
CA; NV; OR; WA
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CA |
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 morefieldii is known only from the White Mountains and adjacent Sierra Nevada. Plants with similar aspect but lacking strigose vestiture occur in White Pine County, Nevada; their disposition is uncertain. Potentilla morefieldii is sometimes confused with P. breweri (sect. Multijugae), but the latter differs in having more or less similar leaflet surfaces with cottony hairs nearly as abundant adaxially as abaxially. Potentilla breweri also lacks the stiff adaxial leaflet hairs that characterize most species in sect. Concinnae, including P. morefieldii. W. L. Jepson (1909–1943, vol. 2) misapplied the name Potentilla pseudosericea var. grandiflora Th. Wolf, which is a synonym of an unresolved species from the Rocky Mountains (B. Ertter 1992; Ertter et al. 2013), to P. morefieldii. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 137. | FNA vol. 9, p. 181. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Arenicolae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Concinnae |
Sibling taxa | ||
Synonyms | Ivesia gracilis | |
Name authority | A. Gray: Proc. Amer. Acad. Arts 6: 532. (1865) — not P. gracilis Douglas ex Hooker 1830 | Ertter: Brittonia 44: 432, fig. 1. (1992) |
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