Potentilla millefolia |
Potentilla thurberi |
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cut-leaf cinquefoil, feather cinquefoil, feather or many-leaf or Klamath cinquefoil, many leaf cinquefoil |
scarlet cinquefoil, Thurber's cinquefoil |
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Habit | Plants ± rosetted; taproots fleshy-thickened. | |||||
Stems | usually prostrate, sometimes ± decumbent, 0.4–2(–3) dm, lengths 1–2 times basal leaves. |
(2–)3–7(–10) dm. |
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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. |
palmate, (2–)4–15(–30) cm; petiole (2–)3–10(–25) cm, long hairs sparse to common, spreading, 1–3.5 mm, weak, glands sparse to abundant, sometimes absent; leaflets 5(–7), at tip of leaf axis, central one (1–)2–6(–8) × (0.5–)1–2.5(–4) cm, petiolules 0(–10) mm, distal 3/4 to whole margin incised 1/5–1/4 to midvein, teeth (4–)7–15(–19) per side (sometimes secondarily toothed), (1–)2–3(–5) mm, teeth apex acute to ± obtuse, surfaces slightly to strongly dissimilar, abaxial pale green to white, straight hairs sparse to abundant, often dense on veins, 0.5–3 mm, cottony hairs absent or sparse to dense, glands ± sparse or absent, sometimes obscured, adaxial green, straight hairs sparse to abundant, 0.2–1 mm, cottony hairs absent, glands ± sparse or absent. |
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Cauline leaves | (0–)1–2. |
stipules usually toothed, sometimes entire. |
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Inflorescences | 3–6(–10)-flowered, loosely cymose, sometimes racemiform. |
(4–)10–35-flowered. |
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Pedicels | (0.5–)1–2(–4.5) cm, ± recurved in fruit. |
0.5–4 cm. |
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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. |
epicalyx bractlets narrowly to broadly lanceolate-elliptic (rarely toothed or lobed), 4–9(–14) × (1–)1.5–2 mm; sepals 4–10(–15) mm, apex acute to acuminate; petals ± dark reddish throughout, (3.5–)6–10 × 6–10 mm; filaments 1.5–3 mm, anthers 0.8–1 mm; carpels 30–70, styles 2.5–3.5 mm. |
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Achenes | 1.5–2 mm, smooth, often ± carunculate. |
1.5 mm, ± rugose. |
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Potentilla millefolia |
Potentilla thurberi |
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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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AZ; NM; nw Mexico
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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.) |
Varieties 2 (2 in the flora). The abaxially white-cottony leaflets of var. atrorubens usually make it easily distinguished from var. thurberi, which lacks cottony hairs and is usually less hairy in general. The two varieties sometimes occur together and intermediates between the extremes are common. The degree of glandularity and the lengths of the central leaflets are greater in the southern populations of both varieties. The glands are less widely distributed on the plants northward and are fewer in northern Arizona and New Mexico. Leaflets are shorter and broader north of Graham County, Arizona, and Otero County, New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 174. | FNA vol. 9, p. 149. | ||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Multijugae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Rubrae | ||||
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) | A. Gray: Pl. Nov. Thurb., 318. (1854) | ||||
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