Ivesia patellifera |
Ivesia rhypara |
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Kingston Mountain mousetail, Kingston Mountains. ivesia |
grimy ivesia, grimy mousetail |
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Habit | Plants green, ± tufted, often forming hanging clumps, sometimes rosetted. | Plants grayish, ± matted. | ||||
Stems | pendent or prostrate to ascending, (0.5–)1–2 dm. |
± prostrate, (0.1–)0.2–1.5(–2) dm. |
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Basal leaves | planar, (2–)5–15 cm; sheathing base not strigose abaxially; petiole 1–5 cm; lateral leaflets (1–)2–3(–4) per side, separate, obovate to orbiculate, 5–20 mm, incised 1/4–1/2 to base into 5–9 broadly ovate teeth, apex not setose, surfaces short-pilose, ± glandular; terminal leaflets distinct. |
tightly cylindric, 2–10 cm; sheathing base densely hairy abaxially; petiole 0.5–4(–10) cm; lateral leaflets 4–10(–15) per side, overlapping at least distally, ± flabellate, 0.5–3(–4) mm, incised to base or nearly so into (0–)2–4(–9) elliptic to obovate or orbiculate lobes, apex usually not setose, surfaces densely hirsute, cryptically glandular; terminal leaflets indistinct. |
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Cauline leaves | (0–)2; blade well developed. |
(0–)1; blade vestigial. |
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Inflorescences | (1–)3–20(–35)-flowered, open, (0.5–)1.5–4(–6) cm diam. |
5–60(–100)-flowered, congested, 0.5–5(–7) cm diam. |
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Pedicels | 5–20(–30) mm. |
1.5–4(–8) mm. |
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Flowers | 7–10 cm diam.; epicalyx bractlets 0; hypanthium patelliform, 0.5(–1) × 2–3 mm; sepals 2–4 mm, broadly acute; petals yellow, narrowly oblanceolate, 2–3 mm; stamens 5–10, filaments 0.6–1.2(–1.5) mm, anthers yellow, oblong, 0.8–1 mm; carpels 4–10, styles 1.5–2 mm. |
4–8 mm diam.; epicalyx bractlets 5, linear to elliptic or narrowly ovate, 0.8–1.6(–2.1) mm; hypanthium patelliform to shallowly cupulate, 1–1.5 × (1.5–)2–3(–3.5) mm; sepals 1.4–2.5(–2.8) mm, acute; petals white to pale yellowish, linear to narrowly oblanceolate, 1–1.5 mm; stamens 5, filaments 0.6–1.8 mm, anthers maroon or yellow with maroon margins, oblong, 0.3–0.6 mm; carpels 1–2(–4), styles 1–1.5 mm. |
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Achenes | greenish white to light tan, 1.5–2 mm, faintly rugose, ± carunculate. |
brown, 1.2–1.6(–2) mm, smooth, prominently carunculate. |
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Ivesia patellifera |
Ivesia rhypara |
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Phenology | Flowering summer. | |||||
Habitat | Dry, rocky outcrops of limestone, usually crevices of more or less vertical protected cliffs or boulders, in conifer woodlands | |||||
Elevation | 1400–2200 m (4600–7200 ft) | |||||
Distribution |
CA |
NV; OR
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Discussion | Of conservation concern. Ivesia patellifera is confined to crevices in steep wash and canyon walls in the Kingston Mountains of San Bernardino County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). Ivesia rhypara forms densely hairy mats or mounds on isolated edaphic sites in the northern Great Basin. Only one of the widely disjunct population clusters is recognized as a distinct variety; the others have general differences in gestalt, but no significant distinctions have been determined (B. Ertter 1989). Isozyme analysis likewise does not show significant differences (T. Kaye et al., unpubl., BLM and Oregon Dept. of Agriculture, 1991). Reproductive studies by D. Wiens (pers. comm.) show low seed set (ca. 5% in var. rhypara, somewhat higher in var. shellyi), possibly indicating a deleterious genetic load. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 224. | FNA vol. 9, p. 228. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Potentilla patellifera | |||||
Name authority | (J. T. Howell) Ertter: Syst. Bot. 14: 232. (1989) | Ertter & Reveal: Madroño 24: 224, fig. 1. (1977) | ||||
Web links |