Horkelia hispidula

Rydberg

in N. L. Britton et al., N. Amer. Fl. 22: 278. 1908.

Common names: White Mountains horkelia
Conservation concernEndemic
Synonyms: Potentilla hispidula (Rydberg) Jepson
Treatment appears in FNA Volume 9. Treatment on page 249. Mentioned on page 248, 264.

Plants 0.7–3 dm diam. Stems ascending to erect, 1–2.5 dm. Basal leaves 3–10 × 0.4–0.8 cm; leaflets (6–)10–14 per side, ± overlapping at least distally, cuneate to flabellate, 2.5–4(–6) mm, divided 3/4+ to midrib into 3–6 oblanceolate to obovate lobes, hispid. Cauline leaves 3–7. Pedicels 2–8(–12) mm. Flowers 3–15, 10 mm diam.; epicalyx bractlets linear to lanceolate, 1.5–3 × 0.2–0.5 mm, ± 2/3 length of sepals; hypanthium 1.8–3 × 3–4 mm, ± 1/2 as deep as wide, interior sparsely pilose; sepals reflexed, broadly lanceolate, 2.5–4(–5) mm, hairs stiff, 0.5 mm; petals not pink-tinged, oblanceolate to oblong or narrowly elliptic, 2.5–5 mm, apex rounded to truncate, sometimes slightly emarginate or mucronate; filaments white, 0.5–2 × 0.4–0.6 mm, glabrous or sparsely pilose adaxially, anthers 0.5–0.9 mm; carpels (10–)12–18(–20); styles 1.8–2.2 mm. Achenes brown to dark brown, 1.5–2 mm.


Phenology: Flowering summer.
Habitat: Dry, rocky alpine flats, in subalpine conifer woodlands
Elevation: 3000–3400 m

Discussion

Of conservation concern.

When describing Horkelia hispidula, Rydberg associated it with H. sericata in his group Sericatae. The species is known only from the White Mountains of California and adjacent Nevada.

Selected References

None.

Lower Taxa

None.
... more about "Horkelia hispidula"
Barbara Ertter +  and James L. Reveal +
Rydberg +
White Mountains horkelia +
Calif. +  and Nev. +
3000–3400 m +
Dry, rocky alpine flats, in subalpine conifer woodlands +
Flowering summer. +
in N. L. Britton et al., N. Amer. Fl. +
Conservation concern +  and Endemic +
Potentilla hispidula +
Horkelia hispidula +
Horkelia sect. Hispidulae +
species +