Ivesia muirii |
Ivesia lycopodioides |
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granite mousetail, Muir's ivesia |
club-moss ivesia, clubmoss mousetail |
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Habit | Plants silvery, usually ± rosetted; taproot stout, sometimes fleshy. | Plants green, usually rosetted, sometimes ± tufted; taproot fusiform, fleshy. | ||||||||
Stems | usually ± erect, sometimes nearly prostrate, 0.5–1.5(–2) dm. |
decumbent to erect, 0.3–3 dm. |
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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. |
tightly to loosely cylindric, 1–15 cm; sheathing base glabrous abaxially; petiole 0.5–4 cm, hairs 0.2–1 mm; leaflets 10–35 per side, 1–8 mm, glabrous or short-hirsute, minutely glandular, lobes (2–)4–8(–10), linear to obovate or ± orbiculate, apex sometimes setose. |
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Cauline leaves | (0–)1–2, paired if 2. |
0–2(–3), not paired. |
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Inflorescences | 10–30-flowered, 1–2(–3.5) cm diam.; glomerules usually 1. |
3–20(–25)-flowered, (0.5–)1–2.5(–3.5) cm diam.; glomerules usually 1. |
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Pedicels | 0.3–2(–3.5) mm. |
(0.5–)1–7(–11) mm. |
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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. |
6–12 mm diam.; epicalyx bractlets oblong to oval, 0.8–2.5(–3) mm; hypanthium shallowly cupulate, 1–2 × 2.5–5 mm; sepals (1.8–)2–4(–4.5) mm, obtuse to acute; petals golden yellow, obovate, 2–5 mm; stamens 5, filaments 0.8–2 mm, anthers yellow, 0.6–0.8 mm; carpels (5–)8–15(–18), styles 1–3 mm. |
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Achenes | grayish brown, mottled with red, 1.6–2 mm. |
greenish tan to light brown, 1.2–1.5 mm. |
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Ivesia muirii |
Ivesia lycopodioides |
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Phenology | Flowering summer. | |||||||||
Habitat | Dry rocky slopes, fellfields, mostly in alpine conifer woodlands and tundra | |||||||||
Elevation | 2900–4000 m (9500–13100 ft) | |||||||||
Distribution |
CA
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CA; NV
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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.) |
Varieties 3 (3 in the flora). The three varieties of Ivesia lycopodioides are for the most part readily distinguished, though intergradation is known. The high-elevation var. lycopodioides extends farthest north; var. scandularis is the only variety in the White Mountains. Variety megalopetala is found mostly at somewhat lower (subalpine) elevations and generally has a more southern range. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 236. | FNA vol. 9, p. 232. | ||||||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Potentilla muirii | Potentilla lycopodioides | ||||||||
Name authority | A. Gray: Proc. Amer. Acad. Arts 8: 627. (1873) | A. Gray: Proc. Amer. Acad. Arts 6: 530. (1865) | ||||||||
Web links |