Ivesia muirii |
Ivesia sabulosa |
|
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granite mousetail, Muir's ivesia |
intermountain ivesia, intermountain mousetail, Sevier ivesia, yellow comarella |
|
Habit | Plants silvery, usually ± rosetted; taproot stout, sometimes fleshy. | Plants ± grayish green. |
Stems | usually ± erect, sometimes nearly prostrate, 0.5–1.5(–2) dm. |
ascending to erect, (1.8–)2–6(–6.5) dm. |
Basal leaves | very tightly cylindric (mousetail-like, with individual leaflets scarcely distinguishable), 2–5(–10) cm; sheathing base densely strigose abaxially; petiole 0.2–0.8(–1) cm, hairs 0.5–1.5 mm; leaflets 25–40 per side, 0.4–1 mm, densely sericeous, glands obscured, lobes 2–5, obovate or oval to orbiculate, apex not 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. |
Cauline leaves | (0–)1–2, paired if 2. |
|
Inflorescences | 10–30-flowered, 1–2(–3.5) cm diam.; glomerules usually 1. |
10–60-flowered, 4–15 cm diam. |
Pedicels | 0.3–2(–3.5) mm. |
(1–)5–20 mm. |
Flowers | 5–6 mm diam.; epicalyx bractlets oblong to obovate, 0.5–1 mm; hypanthium shallowly cupulate, 0.5–1(–1.5) × 1.5–2.5 mm; sepals (1–)1.5–2.5 mm, acute; petals yellow, linear to oblanceolate or narrowly oblong, 1–2 mm; stamens 5, filaments 0.3–0.6 mm, anthers yellow, 0.4–0.6 mm; carpels 1–4, styles 0.7–1.2 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. |
Achenes | grayish brown, mottled with red, 1.6–2 mm. |
brown, 1.7–2.2 mm. |
Ivesia muirii |
Ivesia sabulosa |
|
Phenology | Flowering summer. | Flowering summer. |
Habitat | Dry rocky slopes, fellfields, mostly in alpine conifer woodlands and tundra | Dry flats and slopes, on gravelly volcanic or limestone soil, in sagebrush and other desert shrub communities, montane conifer woodlands |
Elevation | 2900–4000 m (9500–13100 ft) | 1500–2700 m (4900–8900 ft) |
Distribution |
CA
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AZ; NV; UT
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Discussion | Ivesia muirii is known from alpine areas in the Sierra Nevada. It is one of the more distinctive species of the genus, in its silvery mousetail-like leaves and usually tightly capitate inflorescences. Putative hybrids are known with I. lycopodioides (D. D. Keck 1938) and I. pygmaea (Center Basin area of Tulare County). (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.) |
Source | FNA vol. 9, p. 236. | 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 | ||
Synonyms | Potentilla muirii | Potentilla sabulosa, Comarella sabulosa |
Name authority | A. Gray: Proc. Amer. Acad. Arts 8: 627. (1873) | (M. E. Jones) D. D. Keck: Lloydia 1: 124. (1939) |
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