Ivesia longibracteata |
Ivesia jaegeri |
|
---|---|---|
Castle Crags ivesia, longbract mousetail |
Jaeger's ivesia, Jaeger's 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. |
pendent or prostrate to ascending, 0.3–1.5 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, 2–8(–10) cm; sheathing base not or sparsely strigose abaxially; petiole 0.5–4 cm; lateral leaflets (1–)4–6(–8) per side, ± overlapping at least distally, ± flabellate, 2–6(–7) mm, incised nearly to base into 3–6 oblanceolate to narrowly obovate lobes, apex not or scarcely setose, surfaces ± sparsely short-pilose, ± glandular; terminal leaflets indistinct. |
Cauline leaves | 1–3, not paired. |
(1–)2; blade well developed. |
Inflorescences | 3–14-flowered, 1–2.5 cm diam.; glomerules 1. |
(1–)3–15-flowered, open, (0.5–)1.5–4(–7) cm diam. |
Pedicels | 1.5–6 mm. |
5–30 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. |
5–11 mm diam.; epicalyx bractlets 5, lanceolate, 1–2 mm; hypanthium patelliform, 1 × 2–4 mm; sepals 2–3 mm, ± acute; petals yellow, narrowly oblanceolate, 1.5–2 mm; stamens 20, filaments 1–1.5(–1.8) mm, anthers yellow, subrotund, 0.2–0.3 mm; carpels 3–8, styles 1.5–2 mm. |
Achenes | cream to light tan, 1.2–1.5 mm. |
tan to light brown, 1–2 mm, ± rugose, ± carunculate. |
Ivesia longibracteata |
Ivesia jaegeri |
|
Phenology | Flowering summer. | Flowering summer. |
Habitat | Dry crevices of granodioritic igneous rock, in mixed oak-conifer woodlands | Dry, rocky outcrops of limestone origin, usually crevices of more or less vertical protected cliffs or boulders, mainly in conifer woodlands |
Elevation | 1200–1400 m (3900–4600 ft) | 1600–3600 m (5200–11800 ft) |
Distribution |
CA |
CA; NV |
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 jaegeri is known only from the Spring Mountains, Clark County, Nevada, and the Clark Mountains, San Bernardino County, California. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 236. | FNA vol. 9, p. 223. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae |
Sibling taxa | ||
Synonyms | Potentilla jaegeri | |
Name authority | Ertter: Syst. Bot. 14: 233, fig. 1. (1989) | Munz & I. M. Johnston: Bull. Torrey Bot. Club 56: 165. (1929) |
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