Ivesia argyrocoma |
Ivesia callida |
|
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silver-hair ivesia, silverhair mousetail |
Tahquitz ivesia, Tahquitz mousetail |
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Habit | Plants green, ± tufted to matted, often forming hanging clumps, sometimes rosetted. | |
Stems | usually pendent or prostrate to ascending, sometimes nearly erect, 0.2–1.5 dm. |
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Basal leaves | ± loosely cylindric to weakly planar, 1–7 cm; sheathing base sparsely strigose abaxially; petiole 0.3–3 cm; lateral leaflets (1–)5–8 per side, slightly overlapping, elliptic to flabellate, 2–6(–7) mm, incised nearly to base into (0–)2–4 oblanceolate to elliptic lobes, apex sometimes ± setose, surfaces loosely long-strigose, sparsely glandular; terminal leaflets indistinct. |
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Cauline leaves | (1–)2; blade reduced. |
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Inflorescences | 1–10(–15)-flowered, open, (0.5–)2–5 cm diam. |
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Pedicels | 5–15 mm. |
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Flowers | 7–10 mm diam.; epicalyx bractlets 5, narrowly lanceolate, 1.5–3 mm; hypanthium patelliform, 0.5–1 × 2–3 mm; sepals 2–3.5 mm, acute; petals white, obovate, 2–3.5 mm; stamens 20, filaments 1.5–3 mm, anthers maroon, subrotund, 0.2–0.3 mm; carpels 4–8, styles 1.5–1.8 mm. |
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Achenes | greenish white to light tan, 1.5 mm, smooth to lightly rugose, ± carunculate. |
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Ivesia argyrocoma |
Ivesia callida |
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Phenology | Flowering summer. | |
Habitat | Crevices of dry, rocky outcrops of granite, sometimes more or less vertical protected cliffs, in montane conifer woodlands | |
Elevation | 2400–2500 m (7900–8200 ft) | |
Distribution |
CA; nw Mexico
|
CA |
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 callida occurs in the Tahquitz Peak area of the San Jacinto Wilderness Area, San Jacinto Mountains, Riverside County, where two populations are known (K. Berg 1983). Plants form tight mats in horizontal crevices and loose pendent clumps on vertical rock faces. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 242. | FNA vol. 9, p. 224. |
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 callida |
Name authority | (Rydberg) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 284. (1908) | (H. M. Hall) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 286. (1908) |
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