Ivesia muirii |
Ivesia baileyi |
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granite mousetail, Muir's ivesia |
Bailey's ivesia, Owyhee ivesia |
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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, 0.5–2(–2.5) 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. |
planar, 3–12(–18) cm; sheathing base not or sparsely strigose abaxially; petiole 1–8 cm; lateral leaflets 2–6(–10) per side, separate to slightly overlapping distally, ovate or obovate to flabellate, 4–15(–25) mm, incised 1/4–3/4 to base into 3–11(–15) ovate to oblanceolate teeth or lobes, apex not setose, surfaces ± sparsely short-pilose or hirsute, ± glandular; terminal leaflets ± distinct. |
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Cauline leaves | (0–)1–2, paired if 2. |
1–2; blade reduced. |
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Inflorescences | 10–30-flowered, 1–2(–3.5) cm diam.; glomerules usually 1. |
(1–)5–40-flowered, open, (1–)1.5–8(–10) cm diam. |
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Pedicels | 0.3–2(–3.5) mm. |
2–15(–30) 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. |
4–10 mm diam.; epicalyx bractlets 5, narrowly lanceolate to ovate, 0.8–2.5 mm; hypanthium patelliform, 0.5–2 × 2–4 mm; sepals (1.2–)1.5–4 mm, acute; petals white or pale yellow, oblanceolate to narrowly spatulate, 1.5–2.5 mm; stamens 5, filaments 0.5–1.1 mm, anthers yellow, sometimes with reddish margins, oblong, 0.4–0.7 mm; carpels (1–)3–8, styles 0.9–1.8 mm. |
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Achenes | grayish brown, mottled with red, 1.6–2 mm. |
greenish white to light tan, 1.5–2 mm, smooth or rugose, ± carunculate. |
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Ivesia muirii |
Ivesia baileyi |
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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; ID; NV; OR
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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 2 (2 in the flora). The two varieties accepted here were not recognized by D. D. Keck (1938), who instead treated Ivesia setosa as a variety of I. baileyi. Field investigations confirm that the three entities are reasonably distinct morphologically, with intergradation where their otherwise distinct ranges overlap in central Nevada. (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. 226. | ||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Potentilla muirii | Potentilla baileyi | ||||
Name authority | A. Gray: Proc. Amer. Acad. Arts 8: 627. (1873) | S. Watson: Botany (Fortieth Parallel), 90. (1871) | ||||
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