Ivesia gordonii |
Ivesia sabulosa |
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alpine ivesia, alpine mousetail, Gordon's ivesia |
intermountain ivesia, intermountain mousetail, Sevier ivesia, yellow comarella |
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Habit | Plants green, ± tufted, sometimes rosetted; taproot stout, not fleshy. | Plants ± grayish green. | ||||||||||||
Stems | prostrate to erect, (0.2–)0.5–4 dm. |
ascending to erect, (1.8–)2–6(–6.5) 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. |
7–25(–30) cm; sheathing base usually sparsely strigose abaxially; petiole 1–4(–5) cm; leaflets 15–40 per side, ± flabellate, 3–14 mm, usually incised to base into 2–3 oblanceolate lobes, ± densely short-hirsute to -villous. |
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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. |
10–60-flowered, 4–15 cm diam. |
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Pedicels | 1–3(–5) mm. |
(1–)5–20 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. |
9–14 mm diam.; epicalyx bractlets lanceolate, 1–3(–3.3) mm; hypanthium interior golden, 1–2 × 3–5 mm; sepals (2.5–)3.5–6 mm, base golden adaxially, apex acute to acuminate; petals yellow, linear to narrowly oblanceolate, 2–4 mm; stamens 5, filaments 2–4 mm, anthers yellow, sometimes red-rimmed, oblong, 0.6–1.2 mm; carpels 1–5, styles 2–3 mm. |
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Achenes | grayish brown to mottled brown, ± 2 mm. |
brown, 1.7–2.2 mm. |
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Ivesia gordonii |
Ivesia sabulosa |
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Phenology | Flowering summer. | |||||||||||||
Habitat | Dry flats and slopes, on gravelly volcanic or limestone soil, in sagebrush and other desert shrub communities, montane conifer woodlands | |||||||||||||
Elevation | 1500–2700 m (4900–8900 ft) | |||||||||||||
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY
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AZ; NV; UT
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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 sabulosa occurs from central Nevada and southwestern Utah south to Arizona north of the Grand Canyon. (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 | Potentilla sabulosa, Comarella sabulosa | ||||||||||||
Name authority | (Hooker) Torrey & A. Gray: in War Department [U.S.], Pacif. Railr. Rep. 6(3): 72. (1858) | (M. E. Jones) D. D. Keck: Lloydia 1: 124. (1939) | ||||||||||||
Web links |