Potentilla millefolia |
Potentilla angelliae |
|
---|---|---|
cut-leaf cinquefoil, feather cinquefoil, feather or many-leaf or Klamath cinquefoil, many leaf cinquefoil |
Angell's or Boulder Mountain cinquefoil, Boulder Mountain cinquefoil |
|
Habit | Plants ± rosetted; taproots fleshy-thickened. | |
Stems | usually prostrate, sometimes ± decumbent, 0.4–2(–3) dm, lengths 1–2 times basal leaves. |
(0.4–)0.6–1.1 dm, lengths 2–3 times basal leaves. |
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. |
subpinnate, 1 pair of leaflets separate from terminal leaflets, distal leaflets distinct, 1.5–5 cm; petiole 0.5–3(–4) cm, straight hairs abundant, loosely appressed to ascending, 1–2 mm, stiff, cottony hairs absent, glands sparse to abundant; leaflets 5, on distal (1/10–)1/5–1/4 of leaf axis, separate, proximal pair separated from others by 1–3 mm of leaf axis, central leaflets narrowly cuneate to oblanceolate, 0.5–1.5 × 0.3–0.6 cm, petiolules 1 mm, distal 1/4(–1/3) or less of margins incised 1/2 or less to midvein, teeth (0–)1(–2) per side, ± separate, 1 mm, surfaces ± dissimilar, abaxial grayish to white, straight hairs ± abundant, appressed, 1–1.5 mm, ± stiff, cottony hairs abundant to sparse, glands ± sparse or obscured, adaxial greenish, straight hairs abundant, ± appressed, 1–1.5(–2) mm, stiff, cottony hairs absent, glands sparse to abundant. |
Cauline leaves | (0–)1–2. |
|
Inflorescences | 3–6(–10)-flowered, loosely cymose, sometimes racemiform. |
solitary flowers or 2–3-flowered. |
Pedicels | (0.5–)1–2(–4.5) cm, ± recurved in fruit. |
(1–)1.5–3 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 lanceolate-elliptic to ovate, 2–4 × 0.8–1.5 mm; hypanthium 3–5 mm diam.; sepals 3–5(–6) mm, apex ± acute; petals (4–)5–6.5 × 4–5.5 mm; filaments 1.5–2.5 mm, anthers 0.7–1 mm; carpels 10–30, styles 2–2.5 mm. |
Achenes | 1.5–2 mm, smooth, often ± carunculate. |
1.5–2 mm, smooth to faintly rugose. |
Potentilla millefolia |
Potentilla angelliae |
|
Phenology | Flowering spring–summer. | Flowering summer. |
Habitat | Vernally to permanently wet meadows, moist openings in conifer forests and sagebrush, alkaline flats | Rocky subalpine meadows |
Elevation | 700–2200 m (2300–7200 ft) | 3300–3400 m (10800–11200 ft) |
Distribution |
CA; NV; OR
|
UT |
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.) |
Of conservation concern. Potentilla angelliae is known only from Boulder Mountain on the Aquarius Plateau in Garfield and Wayne counties. Comparable plants, whose status has yet to be resolved, have been collected in Montezuma County, Colorado. S. L. Welsh et al. (1993) suggested that P. angelliae might best be treated as a variety of P. concinna; the combination of subpalmate leaves, tridentate leaflets, and relatively few-flowered inflorescences extending beyond the leaves makes P. angelliae a well-defined species with no evidence of intergradation. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 174. | FNA vol. 9, p. 180. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Multijugae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Concinnae |
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) | N. H. Holmgren: Brittonia 39: 342, fig. 2. (1987) |
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