Ivesia gordonii |
Ivesia multifoliolata |
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alpine ivesia, alpine mousetail, Gordon's ivesia |
Coconino ivesia, manyleaf mousetail, red comarella |
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Habit | Plants green, ± tufted, sometimes rosetted; taproot stout, not fleshy. | Plants green. | ||||||||||||
Stems | prostrate to erect, (0.2–)0.5–4 dm. |
ascending to erect, 2–6 dm. |
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Basal leaves | tightly to loosely cylindric, (1–)3–20(–25) cm; sheathing base ± glandular abaxially, otherwise glabrous; petiole 0.5–8 cm, hairs 0.2–0.5 mm; leaflets (6–)10–25 per side, (1–)2–13(–18) mm, glabrous or ± hirsute or villous, glandular-puberulent or -pubescent, lobes (2–)4–8(–15), linear or narrowly oblanceolate to obovate, apex rarely setose. |
6–25(–30) cm; sheathing base minutely glandular abaxially; petiole 0.5–8(–10) cm; leaflets 12–30 per side, obovate to broadly cuneate, 5–12(–15) mm, incised 1/3–1/2 to base into 3–5 oblong to ovate teeth, sometimes entire, sparsely short-strigose to -villous, sometimes glabrate. |
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Cauline leaves | 1(–2), not paired. |
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Inflorescences | 5–50(–70)-flowered, 1–8(–11) cm diam.; glomerules 1–several. |
(5–)8–60-flowered, 2–12 cm diam. |
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Pedicels | 1–3(–5) mm. |
5–30(–35) mm. |
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Flowers | 5–12 mm diam.; epicalyx bractlets linear to narrowly elliptic, (0.5–)1–3.5(–4) mm; hypanthium turbinate to campanulate, (1.5–)2–4(–4.5) × 2–4(–5) mm; sepals (2–)2.5–5(–6) mm, obtuse to ± acute; petals yellow, narrowly oblanceolate to narrowly spatulate, (1–)1.5–3 mm; stamens 5, filaments 1.3–2.5 mm, anthers yellow, sometimes red-margined, 0.5–1 mm; carpels (1–)2–4(–6), styles 2.5–4.5(–6) mm. |
9–12 mm diam.; epicalyx bractlets narrowly lanceolate to lanceolate, 1–2 mm; hypanthium interior brick- to blood-red or golden, 0.5–1.5 × 3–5 mm; sepals 3–4.5 mm, base brick- to blood-red adaxially, apex acute to acuminate; petals brick- to blood-red, linear to oblanceolate or narrowly elliptic, 2–3.5 mm; stamens 5, filaments 1.3–2 mm, anthers maroon, oblong, 0.6–0.9 mm; carpels 1–5, styles 2–3 mm. |
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Achenes | grayish brown to mottled brown, ± 2 mm. |
brown, 2–2.5 mm. |
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2n | = 28. |
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Ivesia gordonii |
Ivesia multifoliolata |
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Phenology | Flowering summer. | |||||||||||||
Habitat | Dry flats and slopes, on gravelly volcanic or sandstone soil, often along seasonal stream courses, in oak and conifer woodlands | |||||||||||||
Elevation | 1800–2400 m (5900–7900 ft) | |||||||||||||
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY
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AZ |
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Discussion | Varieties 4 (4 in the flora). Ivesia gordonii is the most widespread species of the genus, occurring from Washington to Montana, south to central California and Colorado. The species can be distinguished from other members of sect. Ivesia by the relatively deep hypanthium, which is about as deep as wide. Four varieties are provisionally recognized here (B. Ertter and J. L. Reveal 2007), with the likelihood that future work may indicate additional and/or alternate circumscriptions. Populations that are difficult to assign to a variety can be found where the recognizable taxonomic units come together, for example, in northeastern Utah and western Wyoming, involving var. gordonii and var. wasatchensis, and in California and central Idaho where var. alpicola and var. ursinorum tend to merge. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Ivesia multifoliolata is found between the Grand Canyon and Mogollon Rim in northern Arizona. It is both the only species of the genus with red petals and the only one that overlaps the range of the red-petaled Potentilla sect. Rubrae. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 233. | FNA vol. 9, p. 244. | ||||||||||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Comarella | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Horkelia gordonii, Potentilla gordonii | Horkelia multifoliolata, Comarella multifoliolata, Potentilla multifoliolata | ||||||||||||
Name authority | (Hooker) Torrey & A. Gray: in War Department [U.S.], Pacif. Railr. Rep. 6(3): 72. (1858) | (Torrey) D. D. Keck: Lloydia 1: 125. (1939) | ||||||||||||
Web links |