Potentilla inclinata |
Potentilla plattensis |
|
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ashy cinquefoil, potentille inclinée |
Platte cinquefoil, Platte River cinquefoil |
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Habit | Plants rosetted to tufted; taproots fleshy-thickened. | |
Stems | ascending to erect, (1–)1.5–5 dm. |
initially decumbent to sometimes ascending, becoming prostrate or supported by vegetation, (0.3–)0.5–3.5(–4.5) dm, lengths 1.5–2.5(–4) times basal leaves. |
Basal leaves | palmate. |
pinnate with distal leaflets ± distinct, 2–15(–20) × 1–3 cm; petiole 0.5–5 cm, straight hairs common, tightly appressed, 0.5(–1) mm, stiff, cottony hairs absent, glands absent or sparse; primary lateral leaflets (3–)4–6(–8) per side, on distal (1/4–)1/2–3/4 of leaf axis, overlapping to separate, largest ones obovate, 0.5–1.5(–2) × 0.5–1(–1.3) cm, distal (1/2–)2/3 to whole margin pinnately incised 3/4+ to midvein, ultimate teeth 5–10, linear-oblanceolate, 1.5–8(–10) × 1–2 mm, apical tufts less than 0.5 mm, surfaces green to grayish green, not glaucous, straight hairs sparse to common (sparser adaxially), tightly appressed, 0.5 mm, stiff, cottony hairs absent, glands absent or inconspicuous. |
Cauline leaves | 3–9, proximal ones 5–10(–14) cm; proximal petioles 2–6(–8) cm, long hairs sparse to common, spreading to loosely appressed, 1.5–3 mm, soft to weak, short or crisped hairs abundant, cottony hairs mostly absent, glands sparse to common, usually obscured; leaflets 5–7, central one usually ± oblanceolate, (1.5–)2–5 × 0.5–1.5 cm, margins flat or ± revolute, distal (1/2–)3/4+ usually evenly incised 1/2 to midvein, teeth 4–6(–10) per side, surfaces ± dissimilar, abaxial grayish to gray-green, long hairs sparse to common (especially on veins), 1–2.5 mm, soft to weak, short or crisped hairs ± abundant, sometimes sparse, cottony hairs absent, glands ± sparse (usually obscured), adaxial long hairs usually sparse, sometimes absent, 1–2 mm, short hairs absent or sparse, crisped and cottony hairs absent, glands absent or sparse. |
1–3. |
Inflorescences | 10–50+-flowered. |
(1–)3–15(–20)-flowered, loosely cymose, sometimes racemiform. |
Pedicels | 0.3–1.5(–3) cm. |
1–4(–5) cm, ± recurved in fruit. |
Flowers | epicalyx bractlets lanceolate or elliptic to oblong, 3–6 × 1–1.5 mm, length ± 1 times sepals; sepals 3.5–6.5 mm, apex acute to acuminate; petals 4–7(–8) × 4–5(–6) mm; filaments 0.8–2.5 mm, anthers (0.5–)0.8–1.2 mm; carpels 80–100+, styles 0.8–1.1 mm, scarcely papillate-swollen proximally. |
epicalyx bractlets narrowly elliptic to linear-lanceolate, 2–5(–6) × 0.5–2 mm; hypanthium 3–4 mm diam.; sepals 3–6 mm, apex acute; petals 4–7 × 3–6 mm; filaments 1–2.5 mm, anthers 0.5–1 mm, usually ± 1/2 as long as filaments; carpels 10–20, styles 1.5–2.5 mm. |
Achenes | 1 mm, lightly rugose. |
(1.3–)1.5–1.9 mm, smooth, often ± carunculate. |
2n | = 14, 28, 35, 42, 84 (Eurasia). |
= 70. |
Potentilla inclinata |
Potentilla plattensis |
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Phenology | Flowering summer. | Flowering summer. |
Habitat | Dry waste places, along roadsides, ditches, other open sites, in grasslands, oak and conifer woodlands | Moist meadows, streamsides, reservoir margins |
Elevation | 0–2200 m (0–7200 ft) | 300–2900 m (1000–9500 ft) |
Distribution |
AZ; CT; IN; MA; MI; MN; NC; NH; NJ; NY; OH; PA; RI; VA; VT; WA; WI; WY; BC; ON; PE; QC; Eurasia [Introduced in North America]
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AZ; CO; ID; MT; ND; NM; SD; UT; WY; AB; MB; NT; SK
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Discussion | In addition to the characters given in the key, Potentilla inclinata in the flora area tends to have narrower leaflets, more compact inflorescences with fewer flowers, and more coarsely hairy epicalyx bractlets and sepals than P. intermedia. The species is currently becoming more common in western North America. The name Potentilla inclinata has been conserved over P. assurgens Villars (T. Gregor et al. 2009). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Potentilla plattensis occurs mostly east of the Continental Divide from the Canadian Prairies to the mountains of New Mexico. The species barely enters Idaho at Monida Pass (Clark County). Populations also exist in the White Mountains of east-central Arizona and the mountains of southern Utah. The species is relatively uniform throughout its range but there is often significant seasonal variation, such that plants can be compact and densely strigose in early summer but elongate and subglabrous later in the season. Where the ranges of Potentilla plattensis and P. ovina overlap, the two are sometimes difficult to distinguish. The habitats are usually distinct, in that P. plattensis generally occurs in moist valley bottoms and P. ovina occurs in rocky uplands. Differences in vestiture are also diagnostic: hairs of P. plattensis are 0.5 mm and tightly appressed; those of P. ovina are longer and looser. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 145. | FNA vol. 9, p. 173. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Terminales | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Potentilla > sect. Multijugae |
Sibling taxa | ||
Synonyms | P. canescens, P. intermedia var. canescens | P. diversifolia var. madsenii, P. plattensis var. pedicillata |
Name authority | Villars: Hist. Pl. Dauphiné 3: 567, plate 45 [bottom left]. (1788) | Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 439. (1840) |
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