Ivesia longibracteata

Ertter

Syst. Bot. 14: 233, fig. 1. 1989.

Common names: Castle Crags ivesia
Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 236. Mentioned on page 220, 222, 230.

Plants green, ± tufted; taproot ± stout, not fleshy. Stems ascending to erect, 0.3–1.2 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. Cauline leaves 1–3, not paired. Inflorescences 3–14-flowered, 1–2.5 cm diam.; glomerules 1. Pedicels 1.5–6 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. Achenes cream to light tan, 1.2–1.5 mm.


Phenology: Flowering summer.
Habitat: Dry crevices of granodioritic igneous rock, in mixed oak-conifer woodlands
Elevation: 1200–1400 m

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.

Selected References

None.

Lower Taxa

None.
... more about "Ivesia longibracteata"
Barbara Ertter +  and James L. Reveal +
Ertter +
Castle Crags ivesia +
1200–1400 m +
Dry crevices of granodioritic igneous rock, in mixed oak-conifer woodlands +
Flowering summer. +
Conservation concern +  and Endemic +
Lycopodioides +  and Ivesia sect. Lycopodioides +
Ivesia longibracteata +
Ivesia sect. Ivesia +
species +