Ivesia muirii |
Ivesia patellifera |
|
---|---|---|
granite mousetail, Muir's ivesia |
Kingston Mountain mousetail, Kingston Mountains. ivesia |
|
Habit | Plants silvery, usually ± rosetted; taproot stout, sometimes fleshy. | Plants green, ± tufted, often forming hanging clumps, sometimes rosetted. |
Stems | usually ± erect, sometimes nearly prostrate, 0.5–1.5(–2) dm. |
pendent or prostrate to ascending, (0.5–)1–2 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. |
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. |
Cauline leaves | (0–)1–2, paired if 2. |
(0–)2; blade well developed. |
Inflorescences | 10–30-flowered, 1–2(–3.5) cm diam.; glomerules usually 1. |
(1–)3–20(–35)-flowered, open, (0.5–)1.5–4(–6) cm diam. |
Pedicels | 0.3–2(–3.5) mm. |
5–20(–30) 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. |
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. |
Achenes | grayish brown, mottled with red, 1.6–2 mm. |
greenish white to light tan, 1.5–2 mm, faintly rugose, ± carunculate. |
Ivesia muirii |
Ivesia patellifera |
|
Phenology | Flowering summer. | Flowering summer. |
Habitat | Dry rocky slopes, fellfields, mostly in alpine conifer woodlands and tundra | Dry, rocky outcrops of limestone, usually crevices of more or less vertical protected cliffs or boulders, in conifer woodlands |
Elevation | 2900–4000 m (9500–13100 ft) | 1400–2200 m (4600–7200 ft) |
Distribution |
CA
|
CA |
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 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.) |
Source | FNA vol. 9, p. 236. | FNA vol. 9, p. 224. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae |
Sibling taxa | ||
Synonyms | Potentilla muirii | Potentilla patellifera |
Name authority | A. Gray: Proc. Amer. Acad. Arts 8: 627. (1873) | (J. T. Howell) Ertter: Syst. Bot. 14: 232. (1989) |
Web links |