Potentilla hippiana
Potentilla villosula
Hipp's cinquefoil, horse cinquefoil, potentille de Hipp, woolly cinquefoil
Alaska cinquefoil, finely villous cinquefoil
stout, sometimes ± columnar, not sheathed with marcescent whole leaves.
(0.3–)2–4(–5) dm, lengths (1–)2–4 times basal leaves.
ascending to erect, 0.2–1.5(–2) dm, lengths 1.5–3(–4) times basal leaves.
pinnate to subpinnate, (3–)5–15(–25) cm;
petiole 1–10(–15) cm, long hairs abundant to dense, tightly appressed, 1–2.5 mm, stiff, short hairs absent or obscured, crisped-cottony hairs absent or sparse to common, glands absent or obscured;
leaflets not conduplicate, lateral ones evenly (to unevenly in argyrea phase) paired, (2–)3–6(–7) per side on distal (1/6–)1/5–1/2 of leaf axis, distal pairs ± decurrent, often confluent with terminal leaflet, larger leaflets oblanceolate or narrowly obovate to oblong, 1–5(–6) × 0.3–1.5 cm, distal (2/3–)3/4 to whole margin incised 1/2 or less (rarely more) to midvein, teeth (5–)7–12(–18) per side, 1–4 mm, surfaces ± to strongly dissimilar, abaxial white, long hairs abundant (mostly on, but not limited to, veins), 1–2 mm, stiff, short hairs absent or obscured, crisped-cottony hairs abundant to dense, glands absent or obscured, adaxial green to grayish, long hairs sparse to common, rarely absent, short or crisped to, sometimes, cottony hairs absent or sparse to common, glands sparse.
1–5.5(–7) cm;
petiole 0.5–3.5(–5) cm, long hairs common to dense, ascending to spreading, loosely appressed, sometimes retrorse, 1–2(–3) mm, soft, smooth, crisped/short-cottony hairs usually sparse, sometimes common, glands absent or sparse to common or obscured;
leaflets overlapping, central broadly obovate to obtriangular, 0.8–2.5 × 0.6–2 cm, sessile to subsessile, base broadly cuneate, margins revolute, distal 1/2–2/3(–3/4) incised ± 1/2 to midvein, teeth 2–3(–4) per side, ± approximate to ± distant, surfaces ± dissimilar, abaxial grayish to white or yellowish white, long hairs 1.5–2.5 mm, cottony-crisped hairs ± dense, adaxial grayish green, long hairs abundant to dense, crisped hairs absent, sparse, or obscured.
1–2(–3).
(0–)1–2(–3).
10–30-flowered.
(1–)2–3(–4)-flowered.
0.3–3(–5) cm.
0.5–3(–5) cm in flower, to 4(–6) cm in fruit.
epicalyx bractlets narrowly elliptic to lanceolate, rarely linear, 2–5 × 0.5–1.5 mm, (1/2–)2/3 as long as sepals, abaxial vestiture similar to or ± sparser than sepals, usually not glabrescent, straight hairs ± abundant, crisped to sometimes ± cottony hairs absent or sparse to abundant;
hypanthium 3–7 mm diam.;
sepals 4–5.5(–6.5) mm, apex acute to acuminate;
petals 4–8 × 4–7 mm;
filaments 0.5–2.5 mm, anthers 0.6–1.1 mm;
carpels (5–)10–30, styles 1.7–2.5 mm.
epicalyx bractlets broadly lanceolate to narrowly ovate, 3–7(–8) × 1.5–3(–3.5) mm, 2/3 to as wide as sepals, margins ± revolute, red glands absent;
hypanthium (3–)4–6 mm diam.;
sepals 4–7(–8) mm, apex acute or rarely acuminate;
petals 5–10 × 6–12 mm, significantly longer than sepals;
filaments 1.1–1.4 mm, anthers 0.5–0.8 mm;
carpels 40–70, apical hairs absent or sparse (straight), styles narrowly columnar to conic-tapered, papillate-swollen in proximal 1/5 or less, 1–1.2 mm.
1.4–1.8 mm, smooth to faintly rugose.
0.9–2 mm.
= 42, 70, 77, 84, 98.
= 28 (Russian Far East).
Potentilla hippiana
Potentilla villosula
Potentilla hippiana is most common and distinctive in the Colorado Plateau and southern Rocky Mountains, with outliers in the mountains of Arizona, Nevada, and New Mexico. Occurrences are more scattered in the northern Rocky Mountains and Great Plains, where intergradation with P. effusa is common. Among these intermediates are the argyrea phase and the single report from Idaho (B. C. Johnston 1980). Potentilla hippiana is probably adventive in Nova Scotia, eastern Ontario, Quebec, and Michigan, and possibly the Northwest Territories. The reported occurrence in central Alaska (E. Hultén 1968) is based on a specimen of P. pensylvanica (CAN).
Significant variation exists throughout the range of Potentilla hippiana, including dwarfism, leaf division, leaflet dissection, adaxial leaflet vestiture, and pedicel length. Some of this variation might merit taxonomic recognition upon further analysis, especially if correlated with ploidy level (6x through 12x). At present, the differences used to distinguish var. argyrea are not found to be sufficiently correlated with distribution to merit formal taxonomic recognition.
Complicating the infraspecific variation is a tendency for Potentilla hippiana to intergrade with other species, in particular P. effusa. Beyond sect. Leucophyllae, the frequency of hybrids with P. pulcherrima blurs the distinction between the two species; P. gracilis var. hippianoides S. L. Welsh & N. D. Atwood is probably one of the resultant intermediates.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Potentilla villosula was included previously in P. villosa; the two overlap in the southern and western Alaskan coasts, where a transition is suspected to be associated with differing ploidy levels. The plants from this area with silky hairs and multiflowered inflorescences are assigned to P. villosa; P. villosula has thicker, stiffer, and less silky hairs, fewer teeth per leaflet, narrower bracts, fewer and smaller flowers with narrower epicalyx bractlets and sepals, and fewer achenes (sometimes with single apical hairs). While P. villosa is restricted to relatively rocky sites near the coast from western Alaska to Oregon, P. villosula often occurs on coastal sand dunes, farther inland, and/or farther to the north.
As circumscribed, Potentilla villosula is a major plant of Alaska, especially of the Bering Sea region. The species extends from Alaska and the Yukon to at least central British Columbia. Most of the range given by E. Hultén (1968) for P. villosa belongs to P. villosula. W. J. Cody (1996) accepted the name P. villosula for a common south-central Yukon plant, but the majority of the plants mapped by Cody probably belong to P. subgorodkovii (although the distinction between the two species needs more resolution). Provisionally included here are plants from southern and central Yukon south through the Canadian Rockies, possibly including the type of P. nivea subsp. fallax A. E. Porsild. Such plants tend to be significantly smaller overall than Alaskan P. villosula; at least some have straight hairs on carpel apices.
J. Soják (2004) believed that Potentilla villosula evolved from crosses between P. villosa and P. vulcanicola. The affinity with P. villosa is seen in the sericeous vestiture, number of leaflet teeth, and flower number and size, and with P. vulcanicola in the frequent occurrence of straight hairs on carpel apices in both species. Plants with columnar caudex branches, representing a significant part of the Alaskan material, have been called subsp. congesta. This morphology results from the persistence of marcescent whole leaves for several years (in typical P. villosula only sheaths and petioles are retained). This character suggests that P. subvahliana, with which the form called subsp. congesta is sympatric, may be part of its parentage. Potentilla villosula is accepted here in a fairly collective sense, possibly including several hybrid lineages, but with P. villosa a part of them all.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
BC
CalFlora
MI Flora
MN Wildflowers
PNW Herbaria
WildflowerSearch
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