Potentilla wheeleri |
Potentilla fragiformis |
|
---|---|---|
Kern cinquefoil, Wheeler's cinquefoil |
strawberry cinquefoil |
|
Habit | Plants tufted to cushion-forming; caudex branches short, stout, diam. 1–1.5(–2) cm, including old leaf bases. | |
Stems | 0.2–2.5 dm. |
ascending to erect, 0.3–1.5(–2) dm, lengths 1–2 times basal leaves. |
Basal leaves | palmate, 1.5–9.5 cm; petiole 1–7 cm, long hairs abundant to dense, spreading to appressed, 1–2 mm, weak to stiff, glands ± abundant; leaflets 5, central cuneate-elliptic to obovate, 0.5–2.5 × 0.3–1.5 cm, scarcely to distinctly petiolulate, distal 1/3 of margins evenly incised ± 1/4 to midvein, teeth 2–4(–5) per side, surfaces gray-green, long hairs abundant to dense, 1–1.5 mm, glands ± abundant, sometimes obscured. |
not in ranks, ternate, (1–)4–10(–15) cm; stipules: apex acute to obtuse; petiole (0.3–)2–11(–13) cm, long hairs abundant, ascending to spreading, 1–2.3 mm, soft, glands sparse to common; leaflets 3, central obovate, 0.7–2.5 × 0.5–1.6 cm, petiolule 0–1 mm, margins revolute, not lobed, distal 1/2–2/3 evenly incised ± 1/3 to midvein, teeth 2–3(–4) per side, surfaces ± similar, green (paler abaxially), hairs common, 1–1.5 mm, glands common (sparser adaxially). |
Inflorescences | 1–20-flowered. |
1–3-flowered. |
Pedicels | 0.5–1.5 cm. |
straight, 0.5–2 cm in flower, to 3.5 cm in fruit. |
Flowers | epicalyx bractlets lanceolate to ovate-elliptic, 1–3.5 × 1–1.5 mm; hypanthium 2–4 mm diam.; sepals 2–5 mm, apex ± acute; petals ± paler abaxially, bright yellow adaxially, ± obcordate, 3–6 × 2–5 mm; filaments 1–2 mm, anthers 0.5 mm; carpels ca. 20, styles (1.2–)1.5–2 mm. |
epicalyx bractlets oblong, 3–7 × 1.2–2.5 mm, margins revolute; hypanthium 4–6 mm diam.; sepals 4–6(–7) mm, apex broadly acute to obtuse; petals yellow, 9–12 × 8–10 mm; filaments (2–)2.8–3.2 mm, anthers 0.5–0.8 mm; carpels 40–50, styles filiform, not or scarcely papillate-swollen proximally, 1.7–2 mm. |
Achenes | 1–1.5 mm, lightly rugose. |
1.3–1.5. |
Short | hairs not well differentiated from long hairs, absent or sparse throughout. |
|
2n | = 42, 56 (Russian Far East). |
|
Potentilla wheeleri |
Potentilla fragiformis |
|
Phenology | Flowering May–Sep. | Flowering late spring–summer. |
Habitat | Sandy flats, streamsides, lake margins, open conifer woodlands, alpine fellfields | Leymus-Potentilla sand dunes, coastal gravel bars, beach ridges |
Elevation | 1800–3500 m (5900–11500 ft) | 0–10 m (0–0 ft) |
Distribution |
CA
|
AK; e Asia (Russian Far East) |
Discussion | Potentilla wheeleri is found in the southern Sierra Nevada and San Bernardino Mountains of southern California. Compact plants on the summit of Mount San Gorgonio, described by Jepson as var. paupercula, show no consistent difference to justify their taxonomic segregation. Variety viscidula Rydberg has been misapplied to Arizona populations now called P. rhyolitica. Plants identified as P. wheeleri (excluding P. rimicola) from the Sierra San Pedro Mártir (Baja California) stand as a distinct species, P. luteosericea Rydberg (= P. pinetorum Wiggins). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Recent collections of Potentilla fragiformis in Alaska on the coast of the Bering and Chukchi seas have confirmed historical reports (P. A. Rydberg 1908d) of this Beringian species in North America. Dwarf plants from St. Lawrence Island are somewhat intermediate to P. nana but have the larger petals and longer styles of P. fragiformis. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 185. | FNA vol. 9, p. 191. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Subviscosae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Aureae |
Sibling taxa | ||
Synonyms | P. wheeleri var. paupercula | |
Name authority | S. Watson: Proc. Amer. Acad. Arts 11: 148. (1876) | D. F. K. Schlechtendal: Ges. Naturf. Freunde Berlin Mag. Neuesten Entdeck. Gesammten Naturk. 7: 294. (1816) |
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