Ivesia gordonii |
Ivesia shockleyi |
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alpine ivesia, alpine mousetail, Gordon's ivesia |
Shockley's ivesia, sky mousetail |
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Habit | Plants green, ± tufted, sometimes rosetted; taproot stout, not fleshy. | Plants green to grayish green, ± densely matted. | ||||||||||||||||
Stems | prostrate to erect, (0.2–)0.5–4 dm. |
prostrate to ascending, 0.2–1.5 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. |
tightly to loosely cylindric, (1–)2–12(–14) cm; sheathing base strigose to hirsute abaxially; petiole 0.5–4 cm; lateral leaflets (3–)5–15(–18) per side, separate to overlapping at least distally, ± flabellate, 1–4(–6) mm, incised to base or nearly so into 2–10(–12) oblanceolate to obovate or elliptic lobes, apex sometimes setose, surfaces ± sparsely hirsute, ± glandular; terminal leaflets indistinct. |
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Cauline leaves | 1(–2), not paired. |
(0–)1; blade vestigial or reduced. |
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Inflorescences | 5–50(–70)-flowered, 1–8(–11) cm diam.; glomerules 1–several. |
2–20-flowered, ± open, 0.5–4(–6) cm diam. |
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Pedicels | 1–3(–5) mm. |
3–10(–12) 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. |
5–10 mm diam.; epicalyx bractlets 5, elliptic or narrowly oblong to ovate, 0.7–2(–3) mm; hypanthium patelliform, 1–2 × 2.5–4.5(–5) mm; sepals 1.5–3.5(–4) mm, acute to obtuse; petals ± yellow, oblanceolate to spatulate or narrowly obovate, 1–3 mm; stamens 5, filaments 0.8–1.8 mm, anthers yellow, oblong, 0.4–0.9 mm; carpels 2–5(–6), styles 1.8–2.5 mm. |
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Achenes | grayish brown to mottled brown, ± 2 mm. |
greenish cream to light brown, 1.5–2.2(–2.5) mm, smooth, prominently carunculate. |
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Ivesia gordonii |
Ivesia shockleyi |
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Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY
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CA; NV; OR; 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.) |
Varieties 2 (2 in the flora). (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. 227. | ||||||||||||||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | Horkelia gordonii, Potentilla gordonii | Potentilla shockleyi | ||||||||||||||||
Name authority | (Hooker) Torrey & A. Gray: in War Department [U.S.], Pacif. Railr. Rep. 6(3): 72. (1858) | S. Watson: Proc. Amer. Acad. Arts 23: 263. (1888) | ||||||||||||||||
Web links |