Potentilla angelliae
Potentilla thuringiaca
Angell's or Boulder Mountain cinquefoil, Boulder Mountain cinquefoil
European cinquefoil, German cinquefoil, potentille de thuringe
sparse, uncolored, minute.
(0.4–)0.6–1.1 dm, lengths 2–3 times basal leaves.
1.5–5(–7) dm.
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.
4–25(–35) cm;
petiole 2–20(–25) cm, hairs sparse to common, ± spreading, 1–2.5 mm, weak, glands absent or sparse;
leaflets 5–7(–9), central one narrowly to broadly oblanceolate, 1–6(–9) × 0.5–2 cm, distal 2/3–3/4+ of margin incised 1/4–1/3(–1/2) to midvein, teeth (4–)6–10(–13) per side, surfaces ± similar, abaxial green to pale green, hairs sparse to common on primary veins, ascending to spreading, 0.5–1.5 mm, weak, adaxial green, hairs more appressed and shorter.
1–3;
stipules fused with less than 1/3 of petiole, free portion longer than fused portion.
solitary flowers or 2–3-flowered.
5–20-flowered.
(1–)1.5–3 cm.
1–3 cm (proximalmost to 5 cm).
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.
epicalyx bractlets linear to lanceolate, 3–8 × 1–1.5(–2) mm;
hypanthium 3–5 mm diam.;
sepals 3–5 mm, apex ± acute;
petals (5–)8–10 × 4–10 mm;
filaments 0.3–1.5 mm, anthers 0.7–0.9 mm;
carpels 35–50, styles 1.1–1.3 mm.
1.5–2 mm, smooth to faintly rugose.
1–1.2 mm, faintly rugose.
= 42, 56 (Eurasia).
Potentilla angelliae
Potentilla thuringiaca
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.)
Potentilla thuringiaca might be mistaken for the more widely established P. intermedia of sect. Terminales. In addition to having flowering stems lateral to persistent basal leaves, P. thuringiaca has much larger petals (mostly 8–10 mm versus 4–5 mm), 5–9 leaflets, and tubercles at the bases of the long, spreading hairs.
To the Quebec records (and subsequent collections) reported by R. Cayouette (1966) is added Block Island, Rhode Island (Fernald et al. 9650, GH).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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