Potentilla millefolia |
Potentilla pseudosericea |
|
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cut-leaf cinquefoil, feather cinquefoil, feather or many-leaf or Klamath cinquefoil, many leaf cinquefoil |
Mono cinquefoil, Pennsylvania cinquefoil, silky cinquefoil, strigose cinquefoil |
|
Habit | Plants ± rosetted; taproots fleshy-thickened. | |
Caudex branches | sometimes sheathed with marcescent whole leaves. |
|
Stems | usually prostrate, sometimes ± decumbent, 0.4–2(–3) dm, lengths 1–2 times basal leaves. |
decumbent to ascending, (0.2–)0.5–1.5(–2.2) dm. |
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. |
usually palmate, rarely also ternate on same plant or subpalmate, (1–)2–6(–8) cm; petiole (0.5–)1–2.5 cm, long hairs abundant to dense, ± appressed, 0.5–1.2 mm, stiff, verrucose, crisped hairs common, cottony hairs absent, glands sparse to abundant but usually obscured; leaflets (3–)5–7, proximalmost separated by 0–2 mm, central ± obovate, (0.5–)1–1.5(–2) × (0.3–)0.5–0.8(–1) cm, petiolules 0–1 mm, distal 3/4 to nearly whole margin incised 3/4+ to midvein, teeth 2–4(–5) per side, (2–)3–6(–10) mm, apical tufts 0.5 mm, abaxial surfaces white, long hairs common to abundant, cottony-crisped hairs dense, short hairs and glands absent or obscured, adaxial grayish green, long hairs abundant, 0.5–1.5 mm, ± stiff, short-crisped (rarely ± cottony) hairs sparse to common, glands absent or sparse. |
Cauline leaves | (0–)1–2. |
1–3. |
Inflorescences | 3–6(–10)-flowered, loosely cymose, sometimes racemiform. |
(1–)3–10(–20)-flowered, congested or ± elongating in fruit, branch angle 5–30°. |
Pedicels | (0.5–)1–2(–4.5) cm, ± recurved in fruit. |
0.2–0.7 cm, proximal to 1.3 cm. |
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 elliptic, (1–)1.5–2.5(–3) × 0.5–1 mm; hypanthium 3–4 mm diam.; sepals 2–4(–5) mm, apex obtuse to bluntly acute, glands sparse, obscured; petals pale yellow, not overlapping, 2–4 × 2–3 mm, ± equal to sepals (slightly longer than in Inyo County); filaments 1–1.5 mm, anthers 0.3–0.5 mm; carpels 30–50, styles 1–1.2 mm. |
Achenes | 1.5–2 mm, smooth, often ± carunculate. |
1–1.4 mm. |
Potentilla millefolia |
Potentilla pseudosericea |
|
Phenology | Flowering spring–summer. | Flowering summer. |
Habitat | Vernally to permanently wet meadows, moist openings in conifer forests and sagebrush, alkaline flats | Alpine fellfields, moist gravel, talus, on dolomite and quartzite |
Elevation | 700–2200 m (2300–7200 ft) | 3200–3600 m (10500–11800 ft) |
Distribution |
CA; NV; OR
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CA
|
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.) |
Potentilla pseudosericea is currently confirmed only from the central Sierra Nevada and Sweetwater and White mountains of California (B. Ertter 2008). The species is similar to P. modesta but has a more tightly strigose, silvery vestiture and more numerous and deeply incised leaflets. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 174. | FNA vol. 9, p. 209. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Multijugae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Rubricaules |
Sibling 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) | Rydberg: Monogr. N. Amer. Potentilleae, 98, plate 36, figs. 1–5. (1898) |
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