Ivesia argyrocoma |
Ivesia jaegeri |
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silver-hair ivesia, silverhair mousetail |
Jaeger's ivesia, Jaeger's mousetail |
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Habit | Plants green, ± tufted to ± matted, often forming hanging clumps, sometimes rosetted. | |
Stems | pendent or prostrate to ascending, 0.3–1.5 dm. |
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Basal leaves | ± loosely cylindric to weakly planar, 2–8(–10) cm; sheathing base not or sparsely strigose abaxially; petiole 0.5–4 cm; lateral leaflets (1–)4–6(–8) per side, ± overlapping at least distally, ± flabellate, 2–6(–7) mm, incised nearly to base into 3–6 oblanceolate to narrowly obovate lobes, apex not or scarcely setose, surfaces ± sparsely short-pilose, ± glandular; terminal leaflets indistinct. |
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Cauline leaves | (1–)2; blade well developed. |
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Inflorescences | (1–)3–15-flowered, open, (0.5–)1.5–4(–7) cm diam. |
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Pedicels | 5–30 mm. |
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Flowers | 5–11 mm diam.; epicalyx bractlets 5, lanceolate, 1–2 mm; hypanthium patelliform, 1 × 2–4 mm; sepals 2–3 mm, ± acute; petals yellow, narrowly oblanceolate, 1.5–2 mm; stamens 20, filaments 1–1.5(–1.8) mm, anthers yellow, subrotund, 0.2–0.3 mm; carpels 3–8, styles 1.5–2 mm. |
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Achenes | tan to light brown, 1–2 mm, ± rugose, ± carunculate. |
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Ivesia argyrocoma |
Ivesia jaegeri |
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Phenology | Flowering summer. | |
Habitat | Dry, rocky outcrops of limestone origin, usually crevices of more or less vertical protected cliffs or boulders, mainly in conifer woodlands | |
Elevation | 1600–3600 m (5200–11800 ft) | |
Distribution |
CA; nw Mexico
|
CA; NV |
Discussion | Varieties 2 (1 in the flora). Plants from the central Sierra San Pedro Mártir in northern Baja California belong to var. moranii Ertter & Reveal, which may be distinguished by its compact stature (to 0.5 dm), densely villous basal stipules 2–4 mm, decumbent stems 2–7 cm that are stipitate-glandular under the villous indumentum, and solitary, loosely congested cyme. The petals are oblanceolate to narrowly obovate and 2.5–3.5 mm. The grayish, faintly mottled achenes are 1.3–2 mm. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Ivesia jaegeri is known only from the Spring Mountains, Clark County, Nevada, and the Clark Mountains, San Bernardino County, California. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 242. | FNA vol. 9, p. 223. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Unguiculatae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Horkelia argyrocoma, Potentilla argyrocoma | Potentilla jaegeri |
Name authority | (Rydberg) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 284. (1908) | Munz & I. M. Johnston: Bull. Torrey Bot. Club 56: 165. (1929) |
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