Ivesia longibracteata |
Ivesia callida |
|
---|---|---|
Castle Crags ivesia, longbract mousetail |
Tahquitz ivesia, Tahquitz mousetail |
|
Habit | Plants green, ± tufted; taproot ± stout, not fleshy. | Plants green, ± tufted to matted, often forming hanging clumps, sometimes rosetted. |
Stems | ascending to erect, 0.3–1.2 dm. |
usually pendent or prostrate to ascending, sometimes nearly erect, 0.2–1.5 dm. |
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. |
± loosely cylindric to weakly planar, 1–7 cm; sheathing base sparsely strigose abaxially; petiole 0.3–3 cm; lateral leaflets (1–)5–8 per side, slightly overlapping, elliptic to flabellate, 2–6(–7) mm, incised nearly to base into (0–)2–4 oblanceolate to elliptic lobes, apex sometimes ± setose, surfaces loosely long-strigose, sparsely glandular; terminal leaflets indistinct. |
Cauline leaves | 1–3, not paired. |
(1–)2; blade reduced. |
Inflorescences | 3–14-flowered, 1–2.5 cm diam.; glomerules 1. |
1–10(–15)-flowered, open, (0.5–)2–5 cm diam. |
Pedicels | 1.5–6 mm. |
5–15 mm. |
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. |
7–10 mm diam.; epicalyx bractlets 5, narrowly lanceolate, 1.5–3 mm; hypanthium patelliform, 0.5–1 × 2–3 mm; sepals 2–3.5 mm, acute; petals white, obovate, 2–3.5 mm; stamens 20, filaments 1.5–3 mm, anthers maroon, subrotund, 0.2–0.3 mm; carpels 4–8, styles 1.5–1.8 mm. |
Achenes | cream to light tan, 1.2–1.5 mm. |
greenish white to light tan, 1.5 mm, smooth to lightly rugose, ± carunculate. |
Ivesia longibracteata |
Ivesia callida |
|
Phenology | Flowering summer. | Flowering summer. |
Habitat | Dry crevices of granodioritic igneous rock, in mixed oak-conifer woodlands | Crevices of dry, rocky outcrops of granite, sometimes more or less vertical protected cliffs, in montane conifer woodlands |
Elevation | 1200–1400 m (3900–4600 ft) | 2400–2500 m (7900–8200 ft) |
Distribution |
CA |
CA |
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.) |
Of conservation concern. Ivesia callida occurs in the Tahquitz Peak area of the San Jacinto Wilderness Area, San Jacinto Mountains, Riverside County, where two populations are known (K. Berg 1983). Plants form tight mats in horizontal crevices and loose pendent clumps on vertical rock faces. (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 callida | |
Name authority | Ertter: Syst. Bot. 14: 233, fig. 1. (1989) | (H. M. Hall) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 286. (1908) |
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