Potentilla pseudosericea |
Potentilla uliginosa |
|
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Mono cinquefoil, Pennsylvania cinquefoil, silky cinquefoil, strigose cinquefoil |
Cunningham Marsh cinquefoil |
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Habit | Plants rosetted to tufted; taproots not fleshy-thickened. | |
Caudex branches | sometimes sheathed with marcescent whole leaves. |
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Stems | decumbent to ascending, (0.2–)0.5–1.5(–2.2) dm. |
probably prostrate to decumbent, or ± ascending in supporting vegetation, 2.5–5.5 dm, lengths 1–2 times basal leaves. |
Basal leaves | 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. |
pinnate with distal leaflets ± confluent, 15–32 × 2–4 cm; petiole 5–10(–15) cm, straight hairs absent or sparse to common, appressed, 0.5–1.5 mm, stiff, cottony hairs absent, glands absent or sparse; primary lateral leaflets 6–10(–12) per side (irregularly paired), on distal ± 1/2 of leaf axis, loosely overlapping to proximally separate, largest ones cuneate to flabellate, 1.2–2.2 × 1–3 cm, ± whole margin unevenly incised 3/4 to nearly to midvein, ultimate segments (3–)5–10(–15), linear to narrowly oblanceolate, 5–17 × 1–2.5 mm, apical tufts less than 0.5 mm, surfaces green, not glaucous, straight hairs sparse (often glabrate adaxially), appressed, 0.5–1(–1.5) mm, stiff, cottony hairs absent, glands absent or sparse. |
Cauline leaves | 1–3. |
2. |
Inflorescences | (1–)3–10(–20)-flowered, congested or ± elongating in fruit, branch angle 5–30°. |
6–10-flowered, very openly cymose. |
Pedicels | 0.2–0.7 cm, proximal to 1.3 cm. |
1–6 cm, ± recurved in fruit. |
Flowers | 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. |
epicalyx bractlets narrowly elliptic to oblong-ovate, 4–6 × 1–2.5 mm; hypanthium 5–6 mm diam.; sepals 4–7 mm, apex acute; petals 6–10 × 5–8 mm; filaments (1.5–)2–3 mm, anthers 0.7–1.2 mm; carpels ca. 10, styles 2.5–3.5 mm. |
Achenes | 1–1.4 mm. |
2–2.6 mm, smooth, ± carunculate. |
Potentilla pseudosericea |
Potentilla uliginosa |
|
Phenology | Flowering summer. | Flowering spring–summer. |
Habitat | Alpine fellfields, moist gravel, talus, on dolomite and quartzite | Permanent oligotrophic wetlands |
Elevation | 3200–3600 m (10500–11800 ft) | 30–40 m (100–100 ft) |
Distribution |
CA
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CA |
Discussion | 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.) |
Of conservation concern. Potentilla uliginosa is known only from a handful of historical collections from Cunningham Marsh, one of three wetlands in southern Sonoma County that harbor a suite of disjunct and regionally rare species (B. C. Johnston and B. Ertter 2010). Although previously included in P. hickmanii, P. uliginosa differs in having woodier caudices, longer stems and leaves, and more deeply incised leaflets occupying less of the leaf axis. Potentilla uliginosa is presumed extinct; however, a morphologically comparable collection of the P. millefolia complex from Josephine County, Oregon (Deer Creek, near Selma, 14 June 1929, Applegate 5735, UC), opens the possibility of additional undiscovered populations in the mountains of northwestern California. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 209. | FNA vol. 9, p. 175. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Rubricaules | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Multijugae |
Sibling taxa | ||
Name authority | Rydberg: Monogr. N. Amer. Potentilleae, 98, plate 36, figs. 1–5. (1898) | B. C. Johnston & Ertter: J. Bot. Res. Inst. Texas 4: 14, fig. 1. (2010) |
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