Potentilla supina |
Potentilla argentea |
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bushy cinquefoil, spreading cinquefoil |
hoary cinquefoil, potentille argentée, silver cinquefoil, silver-leaf cinquefoil, silvery cinquefoil |
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Stems | mostly decumbent to ascending, 1–6 dm. |
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Basal leaves | palmate. |
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Cauline leaves | 2–9, proximal ones 2–7(–10) cm; proximal petioles 1–4(–7) cm, long hairs absent or sparse, ± ascending, 1–2 mm, soft, short and crisped hairs absent or obscured, cottony hairs dense, glands absent or obscured; leaflets 5(–7), central one ± oblanceolate, (0.5–)1–3 × 0.3–1(–1.3) cm, margins revolute, distal 1/2–2/3 evenly or unevenly incised 1/2–3/4+ to midvein, teeth 2–3 per side (more if lobed or secondarily toothed), surfaces strongly dissimilar, abaxial white, long hairs ± sparse (mostly on veins), 1–2 mm, weak, short and crisped hairs absent or obscured, cottony hairs dense, glands absent or obscured, adaxial long hairs absent or sparse to common, short or crisped hairs absent or sparse, cottony hairs absent, glands absent or sparse. |
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Inflorescences | 10–80-flowered. |
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Pedicels | 0.3–1.5(–2) cm. |
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Flowers | epicalyx bractlets oblong to narrowly ovate, 1.5–3 × 0.7–1.2 mm, lengths 2/3–1 times sepals; sepals 2–4.5 mm, apex ± acute; petals (2–)2.5–4 × 1.5–3 mm; filaments 0.8–1.5 mm, anthers 0.3–0.6(–0.8) mm; carpels 30–60, styles 0.6–0.9 mm, often strongly papillate-swollen proximally. |
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Achenes | 0.8–1.1 mm, smooth to lightly rugose. |
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2n | = 14, 28, 35, 42, 56, 62 (Eurasia). |
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Potentilla supina |
Potentilla argentea |
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Phenology | Flowering spring–summer. | |
Habitat | Dry flats and slopes, roadsides, dry ditches, other open sites, in grasslands, oak and conifer woodlands | |
Elevation | 0–2000 m (0–6600 ft) | |
Distribution |
CO; IA; ID; IL; KS; LA; MI; MN; MO; MT; ND; NE; NM; NY; OH; OK; OR; PA; SD; TX; UT; WA; WY; AB; BC; MB; NT; ON; SK; Mexico; Eurasia; Africa [Introduced in Australia]
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CO; CT; DC; IA; ID; IL; IN; KY; MA; MD; ME; MI; MN; MO; MT; NC; ND; NH; NJ; NY; OH; OR; PA; RI; SD; TN; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NF; NS; ON; PE; QC; SK; SPM; Eurasia [Introduced in North America; introduced also in Pacific Islands (New Zealand)]
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Discussion | Subspecies 7 (1 in the flora). The status of Potentilla supina in North America is open to question, given the otherwise Eurasian and northern African distribution of the species and ease of transport by migratory waterfowl. Although North American material has commonly been treated as a distinct species (P. paradoxa), E. Hultén and M. Fries (1986) went so far as to consider P. supina introduced in North America. The use of subspecies within a broadly defined P. supina follows J. Soják (1987, 1993) and is also adopted by A. Kurtto et al. (in J. Jalas et al. 1972+, vol. 13). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The bright, silvery vestiture of the leaves quickly distinguishes Potentilla argentea from P. inclinata and P. intermedia. Although treated here as introduced, some (P. A. Rydberg 1898; P. A. Werner and J. D. Soule 1976) considered P. argentea to be probably native in eastern North America. The Potentilla argentea species group is an amphi- or apomictic polyploid complex that has been the subject of numerous cytological, sexual, and molecular studies (for example, A. Müntzing and G. Müntzing 1945; A. Müntzing 1958; J. Paule et al. 2011). Taxonomic treatments have ranged from a highly polymorphic single species to an abundance of species, varieties, and forms (T. Wolf 1908). This treatment is at the conservative end of the spectrum. Some New England references (R. C. Bean et al. 1967; F. C. Seymour 1969) distinguish plants with densely white-hairy adaxial leaflet surfaces as var. pseudocalabra Th. Wolf, a name based on plants from southeastern Europe. Molecular analysis by Paule et al. supports the conclusion by Wolf that the variety consists of intermediates between P. argentea and P. calabra Tenore. The optimum taxonomic disposition of var. pseudocalabra, and whether any North American plants are properly included, remains to be determined. Potentilla argentea has been reported as an active agent in treating cirrhosis of the liver (N. T. Starostenko and V. N. Starostenko 1971). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 139. | FNA vol. 9, p. 144. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Rivales | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Terminales |
Sibling taxa | ||
Subordinate taxa | ||
Name authority | Linnaeus: Sp. Pl. 1: 497. (1753) | Linnaeus: Sp. Pl. 1: 497. (1753) |
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