Potentilla millefolia |
Potentilla hookeriana |
|
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cut-leaf cinquefoil, feather cinquefoil, feather or many-leaf or Klamath cinquefoil, many leaf cinquefoil |
graceful cinquefoil, Hooker's cinquefoil |
|
Habit | Plants ± rosetted; taproots fleshy-thickened. | |
Caudex branches | not sheathed with marcescent whole leaves. |
|
Stems | usually prostrate, sometimes ± decumbent, 0.4–2(–3) dm, lengths 1–2 times basal leaves. |
ascending to nearly erect, (0.3–)0.5–2 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 both ternate and palmate on same plant, rarely subpalmate, 1–9 cm; petiole 0.5–6 cm, long hairs common to abundant, ± appressed to ascending-spreading, (0.5–)1–1.5(–2) mm, usually stiff, rarely weak, verrucose, short-crisped hairs sparse to common, cottony hairs absent, glands ± sparse; leaflets 3–5, proximalmost separated by 0(–1) mm, central oblanceolate to obovate, 0.5–2.5 × 0.4–1.2 cm, petiolules 0–1 mm, distal ± 3/4 of margin incised 1/2–3/4, rarely +, to midvein, teeth 2–6 per side, 1–5 mm, apical tufts 0.5–1 mm, abaxial surfaces grayish white to white, long hairs common to abundant, cottony-crisped hairs usually dense, short hairs and glands absent or obscured, adaxial green to grayish green, long hairs sparse to common, 0.5–1.5 mm, usually stiff, short and/or crisped hairs sparse to common, cottony hairs absent, glands sparse to common. |
Cauline leaves | (0–)1–2. |
1–2. |
Inflorescences | 3–6(–10)-flowered, loosely cymose, sometimes racemiform. |
1–6(–8)-flowered, open, branch angle 20–50°. |
Pedicels | (0.5–)1–2(–4.5) cm, ± recurved in fruit. |
(0.5–)1–2 cm, proximal to 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 linear to oblong-lanceolate, 2–3 × 0.7–1.3 mm; hypanthium 3–4 mm diam.; sepals 3–5 mm, apex subacute, glands ± common, not obscured; petals yellow, ± overlapping, 3–6(–7) × 4–5 mm, usually longer than sepals; filaments 0.5–1.5 mm, anthers 0.3–0.5 mm; carpels 30–50, styles 0.8–1.2 mm. |
Achenes | 1.5–2 mm, smooth, often ± carunculate. |
1–1.3 mm. |
Potentilla millefolia |
Potentilla hookeriana |
|
Phenology | Flowering spring–summer. | Flowering (spring–)summer. |
Habitat | Vernally to permanently wet meadows, moist openings in conifer forests and sagebrush, alkaline flats | Alpine ridges, fellfields, scree slopes, rocky canyons |
Elevation | 700–2200 m (2300–7200 ft) | 1400–3900 m (4600–12800 ft) |
Distribution |
CA; NV; OR
|
CO; ID; MT; NV; UT; WY; AB; BC |
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.) |
As here defined, Potentilla hookeriana consists of primarily alpine plants from the Rocky Mountains and adjacent desert mountains that share many of the same characters with P. rubricaulis but are smaller overall. Arctic plants previously included in P. hookeriana are now assigned to P. arenosa (J. Soják 1986; B. Ertter et al. 2013). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 174. | FNA vol. 9, p. 208. |
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 | P. nivea subsp. hookeriana, P. nivea var. hookeriana |
Name authority | Rydberg: Bull. Torrey Bot. Club 23: 433, plate 277, figs. 1–5. (1896) | Lehmann: Index Seminum (Hamburg) 1849: 10. (1849) |
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