Potentilla millefolia |
Rosaceae subfam. rosoideae |
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cut-leaf cinquefoil, feather cinquefoil, feather or many-leaf or Klamath cinquefoil, many leaf cinquefoil |
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Habit | Plants ± rosetted; taproots fleshy-thickened. | Herbs, shrubs, or subshrubs. |
Stems | usually prostrate, sometimes ± decumbent, 0.4–2(–3) dm, lengths 1–2 times basal leaves. |
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Leaves | alternate, rarely opposite, pinnately compound, sometimes simple or palmately compound; stipules present, rarely absent. |
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Basal leaves | pinnate with distal leaflets ± confluent, 2–15(–20) × 1–3 cm; petiole 0.5–2(–3) cm, straight hairs sparse to abundant, appressed to spreading, 0.5–1.5 mm, stiff, cottony hairs absent, glands absent or sparse; primary lateral leaflets (3–)5–13 per side, on distal 2/3–3/4+ of leaf axis, separate to overlapping, largest ones cuneate to flabellate, 0.5–1.5(–2) × 0.5–2 cm, distal 2/3 to whole margin palmately or unevenly, rarely pinnately, incised 2/3 to completely to midvein, ultimate teeth or segments (1–)2–10, linear to broadly oblanceolate, 2–10 × (0.5–)1–2 mm, apical tufts to 1 mm, surfaces green to grayish green, not glaucous, straight hairs sparse to abundant, appressed to spreading, 0.5–1.5(–2) mm, stiff, cottony hairs absent, glands sparse to common. |
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Cauline leaves | (0–)1–2. |
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Inflorescences | 3–6(–10)-flowered, loosely cymose, sometimes racemiform. |
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Pedicels | (0.5–)1–2(–4.5) cm, ± recurved in fruit. |
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Flowers | epicalyx bractlets ± elliptic, 2–4(–6) × 1–2(–2.5) mm; hypanthium 3–6 mm diam.; sepals 4–6(–8) mm, apex acute; petals 4–8(–10) × 3–7(–9) mm; filaments 2–3.5 mm, anthers 0.7–1 mm; carpels 10–30, styles (1.5–)2–3 mm. |
torus usually enlarged, sometimes small or absent; carpels 1–260(–450), distinct, free, styles distinct, rarely connate (Roseae); ovules 1(or 2), collateral (Rubeae) or superposed (Fallugia, Filipendula). |
Fruits | achenes or aggregated achenes sometimes with fleshy, urn-shaped hypanthium or enlarged torus, sometimes aggregated drupelets; styles persistent or deciduous, not elongate (elongate but not plumose in Geum). |
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Achenes | 1.5–2 mm, smooth, often ± carunculate. |
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x | = 7(8). |
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Potentilla millefolia |
Rosaceae subfam. rosoideae |
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Phenology | Flowering spring–summer. | |
Habitat | Vernally to permanently wet meadows, moist openings in conifer forests and sagebrush, alkaline flats | |
Elevation | 700–2200 m (2300–7200 ft) | |
Distribution |
CA; NV; OR
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North America; Mexico; Central America; South America; West Indies; Bermuda; Eurasia; Africa; Atlantic Islands; Indian Ocean Islands; Pacific Islands; Australia |
Discussion | Potentilla millefolia occurs from central Oregon to the east side of the Sierra Nevada of California, with a disjunct occurrence on the alkaline flats of Reese River Valley, Nevada. Significant variation occurs in vestiture type, leaflet dissection, and flower size, but with minimal geographic correlation. The most distinctive variant, represented by the type of P. klamathensis, has relatively long, slender, spreading, pustule-based hairs, often intermixed with shorter hairs. This vestiture type does not appear to be correlated with any other characters or geographic distribution and may vary within a population. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variation in the number of genera in subfam. Rosoideae is due to differences in generic delimitation between D. Potter et al. (2007) and the authors of some Potentilleae genera. Cyanogenic glycosides and sorbitol are absent in the subfamily. Tribes 6, genera 28–35, species ca. 1600 (6 tribes, 26 genera, 302 species, including 1 hybrid, in the flora) (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 174. | FNA vol. 9, p. 23. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Multijugae | Rosaceae |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | P. klamathensis, P. millefolia var. klamathensis, P. plattensis var. klamathensis, P. plattensis var. millefolia | |
Name authority | Rydberg: Bull. Torrey Bot. Club 23: 433, plate 277, figs. 1–5. (1896) | Arnott: Botany, 107. (1832) |
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