Ivesia campestris |
Ivesia gordonii |
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field ivesia, field mousetail, Kaweah ivesia |
alpine ivesia, alpine mousetail, Gordon's ivesia |
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Habit | Plants green to grayish; glands sparse. | Plants green, ± tufted, sometimes rosetted; taproot stout, not fleshy. | ||||||||||||
Stems | decumbent to ascending, 1–3.5 dm. |
prostrate to erect, (0.2–)0.5–4 dm. |
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Basal leaves | (3–)5–15(–18) cm; sheathing base glabrous or sparsely strigose abaxially; stipules ± lanceolate, 2.5–5 mm; petiole (0.3–)0.5–6(–8) cm, hairs sparse to abundant, appressed-ascending, 1–2 mm; leaflets 15–20 per side, loosely overlapping, 2–10 mm, lobes 2–5, oblanceolate, hairs sparse to abundant, spreading to ascending, 1–2 mm. |
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. |
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Cauline leaves | 3–4. |
1(–2), not paired. |
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Inflorescences | 5–20(–40)-flowered, (1–)1.5–2.5(–4) cm diam., flowers arranged in 1–few ± tight glomerules of 10–15 flowers. |
5–50(–70)-flowered, 1–8(–11) cm diam.; glomerules 1–several. |
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Pedicels | 1–4 mm. |
1–3(–5) mm. |
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Flowers | 7–10 mm diam.; epicalyx bractlets linear to oblong, 1–2(–2.5) mm; hypanthium campanulate, 1–2 × 2.5–4 mm, ± 1/2 as deep as wide; sepals green, 2–3(–3.5) mm, acute; petals 4(–5), light yellow, oblanceolate to spatulate or narrowly obovate, 3–4 mm; stamens 12–16 (4-merous flowers) or 16–20 (5-merous flowers), filaments filiform, 0.6–1.1 mm, anthers yellowish, 0.3–0.5 mm; carpels 4–20, styles 1.4–2 mm. |
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. |
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Achenes | light brown, 1–1.5 mm. |
grayish brown to mottled brown, ± 2 mm. |
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Ivesia campestris |
Ivesia gordonii |
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Phenology | Flowering summer. | |||||||||||||
Habitat | Moist meadows and slopes, in montane to subalpine conifer woodlands | |||||||||||||
Elevation | 2200–3400 m (7200–11200 ft) | |||||||||||||
Distribution |
CA
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CA; CO; ID; MT; NV; OR; UT; WA; WY
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Discussion | Ivesia campestris is found in the southern Sierra Nevada south of the Kings River, where it replaces I. unguiculata and often occurs at higher elevations. Ivesia campestris is the only member of the genus that commonly has 4-merous flowers. It is sometimes misidentified as I. unguiculata, especially when the pale yellow petals have faded to creamy white; the glomerules of the inflorescences tend to be yellowish green to green rather than purplish. Also, the anthers of I. campestris are yellowish, rather than maroon. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
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Key |
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Source | FNA vol. 9, p. 242. | FNA vol. 9, p. 233. | ||||||||||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Unguiculatae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Potentilla utahensis var. campestris, P. campestris | Horkelia gordonii, Potentilla gordonii | ||||||||||||
Name authority | (M. E. Jones) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 285. (1908) | (Hooker) Torrey & A. Gray: in War Department [U.S.], Pacif. Railr. Rep. 6(3): 72. (1858) | ||||||||||||
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