Potentilla anglica
Potentilla angelliae
English cinquefoil, potentille d'angleterre, trailing cinquefoil, trailing tormentil, wood cinquefoil
Angell's or Boulder Mountain cinquefoil, Boulder Mountain cinquefoil
soon becoming prostrate, ± flagelliform, usually openly branched, eventually rooting at some nodes, (0.3–)1.5–7+ dm.
(0.4–)0.6–1.1 dm, lengths 2–3 times basal leaves.
± persistent, ternate or palmate, 2–10(–12) cm;
petiole 1–7(–8) cm, long hairs sparse to abundant, appressed, 0.5–1 mm, stiff, glands absent;
leaflets 3–5, central ± obovate to cuneate, 1–3(–3.5) × 0.8–2(–2.5) cm, distal ± 1/2 of margin incised 1/4–1/3(–1/2) to midvein, teeth 2–4 per side, surfaces similar, green, sparsely to moderately hairy.
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.
2–3(–4) proximal to 1st flowering or branching node, usually well expanded at anthesis, usually ternate, 2–6(–10) cm;
petiole 0.3–4(–8) cm;
leaflets (3–)5, ± resembling or narrower than those of basal leaves, narrowly cuneate, 1–2(–3.5) × 0.8–2(–2.5) cm, apex rounded to obtuse.
solitary flowers at stolon nodes.
solitary flowers or 2–3-flowered.
(1–)3–10(–17) cm.
(1–)1.5–3 cm.
4(–5)-merous;
epicalyx bractlets narrowly elliptic to oblong or ovate, 3–4(–7) × 1–1.5 mm, smaller than to slightly larger than sepals;
hypanthium 2–4 mm diam.;
sepals (3–)4–6 mm, apex broadly acute or acuminate;
petals 6–9 × 5–9 mm, apex ± retuse;
stamens 15–20, filaments 0.8–1.2 mm, anthers 0.8–1.2 mm;
carpels 20–50, styles 0.9–1.5 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.
1–1.5(–1.8) mm, ± smooth.
1.5–2 mm, smooth to faintly rugose.
± erect, stout to slender, 1–4 cm.
= 28, 56 (Europe).
Potentilla anglica
Potentilla angelliae
Potentilla anglica apparently is a product of hybridization involving P. erecta and P. reptans (B. Matfield and J. R. Ellis 1972) that has become stabilized and distinct from both parents. In Europe, it forms back-cross hybrids with both P. erecta (P. ×suberecta Zimmeter) and P. reptans (P. ×mixta Nolte); these hybrids are not known from North America. A garden hybrid supposedly between P. anglica and P. nepalensis Hooker (known as P. ×tonguei Mallett) was found in Allegany State Park, New York, but this was likely cultivated rather than naturalized.
Potentilla anglica probably was introduced even in Newfoundland (A. Kurtto et al. in J. Jalas et al. 1972+, vol. 13), contrary to the view expressed by M. L. Fernald (1950).
The name Potentilla procumbens Sibthorp was previously used for this species; that is a superfluous and illegitimate name.
(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.)
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