Ivesia longibracteata |
Ivesia shockleyi |
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Castle Crags ivesia, longbract mousetail |
Shockley's ivesia, sky mousetail |
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Habit | Plants green, ± tufted; taproot ± stout, not fleshy. | Plants green to grayish green, ± densely matted. | ||||
Stems | ascending to erect, 0.3–1.2 dm. |
prostrate to ascending, 0.2–1.5 dm. |
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Basal leaves | weakly planar to loosely ± cylindric, (0.5–)2–4(–6) cm; sheathing base glandular abaxially, otherwise glabrous; petiole 0.5–2 cm, hairs 0.2–1 mm; leaflets 5–6 per side, 2–6 mm, ± short-hirsute, glandular-puberulent, lobes 2–7, oblanceolate to spatulate or obovate, apex not setose. |
tightly to loosely cylindric, (1–)2–12(–14) cm; sheathing base strigose to hirsute abaxially; petiole 0.5–4 cm; lateral leaflets (3–)5–15(–18) per side, separate to overlapping at least distally, ± flabellate, 1–4(–6) mm, incised to base or nearly so into 2–10(–12) oblanceolate to obovate or elliptic lobes, apex sometimes setose, surfaces ± sparsely hirsute, ± glandular; terminal leaflets indistinct. |
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Cauline leaves | 1–3, not paired. |
(0–)1; blade vestigial or reduced. |
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Inflorescences | 3–14-flowered, 1–2.5 cm diam.; glomerules 1. |
2–20-flowered, ± open, 0.5–4(–6) cm diam. |
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Pedicels | 1.5–6 mm. |
3–10(–12) mm. |
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Flowers | 8–10 mm diam.; epicalyx bractlets linear to narrowly lanceolate or elliptic, 2.5–5 mm, longer than sepals; hypanthium shallowly cupulate, 0.5–1 × 2–3 mm; sepals 1.5–2.5 mm, ± acute; petals pale yellow, linear to narrowly oblanceolate, 1.5–2.5 mm; stamens 5, filaments 0.7–1.3 mm, anthers yellow, 0.5–0.8 mm; carpels 6–11, styles 1–1.5 mm. |
5–10 mm diam.; epicalyx bractlets 5, elliptic or narrowly oblong to ovate, 0.7–2(–3) mm; hypanthium patelliform, 1–2 × 2.5–4.5(–5) mm; sepals 1.5–3.5(–4) mm, acute to obtuse; petals ± yellow, oblanceolate to spatulate or narrowly obovate, 1–3 mm; stamens 5, filaments 0.8–1.8 mm, anthers yellow, oblong, 0.4–0.9 mm; carpels 2–5(–6), styles 1.8–2.5 mm. |
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Achenes | cream to light tan, 1.2–1.5 mm. |
greenish cream to light brown, 1.5–2.2(–2.5) mm, smooth, prominently carunculate. |
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Ivesia longibracteata |
Ivesia shockleyi |
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Phenology | Flowering summer. | |||||
Habitat | Dry crevices of granodioritic igneous rock, in mixed oak-conifer woodlands | |||||
Elevation | 1200–1400 m (3900–4600 ft) | |||||
Distribution |
CA |
CA; NV; OR; UT
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Discussion | Of conservation concern. Ivesia longibracteata is known only from the Castle Crags area of Shasta County. The epithet alludes to a diagnostic characteristic unique in the genus: the epicalyx bractlets are longer than the sepals. The plants grow on vertical rock faces, a habitat more characteristic of sect. Setosae; however, the stems are ascending to erect and do not form hanging clumps, and the pedicels are not curved in fruit. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (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. 227. | ||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Potentilla shockleyi | |||||
Name authority | Ertter: Syst. Bot. 14: 233, fig. 1. (1989) | S. Watson: Proc. Amer. Acad. Arts 23: 263. (1888) | ||||
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