Horkelia hispidula

Rydberg in N. L. Britton et al.

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.

No values specified."dm" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property.

... more about "Horkelia hispidula"
brown +  and dark-brown +
1.5mm +  and 2mm +
longer than wide +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
Barbara Ertter +  and James L. Reveal +
Rydberg in N. L. Britton et al. +
compound +  and simple +
opposite +  and alternate +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
flattened +
30 cm300 mm <br />0.3 m <br /> (40 cm400 mm <br />0.4 m <br />) +
planar +  and cylindric +
2 cm20 mm <br />0.02 m <br /> (30 cm300 mm <br />0.3 m <br />) +
reduced +
free +  and distinct +
White Mountains horkelia +
open to congested +
Calif. +  and Nev. +
not +  and aggregated +
3000–3400 m +
linear +  and lanceolate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
pilose +  and glabrous +
flattened +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
10 cm100 mm <br />0.1 m <br /> (?) +
unisexual +  and bisexual +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
not +  and aggregated +
obliquely ovoid +  and reniform +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Dry, rocky alpine flats, in subalpine conifer woodlands +
0.5 cm5 mm <br />0.005 m <br /> (?) +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
sparsely pilose +  and densely villous +
0.1 cm1 mm <br />0.001 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
crassinucellate +
opposite +  and alternate +
marcescent +
winter-persistent +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
oblanceolate +  and obovate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
oblanceolate +
palmate +  and pinnate +
shallowly toothed +  and deeply divided +
inferior +  and superior +
clustered +, biseriate +  and superposed +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
recurved +  and reflexed +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0 (?) +  and 4 (?) +
free +  and distinct +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering summer. +
adnate +, free +, connate +  and distinct +
in N. L. Britton et al., N. Amer. Fl. +
not arillate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
persistent +
free +  and distinct +
lanceolate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Conservation concern +  and Endemic +
free +  and distinct +
branched +  and simple +
stramineous +, reddish +  and green +
ascending +  and erect +
1 +  and 10 +
palmate +  and pinnate +
deciduous +
distinct +
subterminal +
filiform +
rough-thickened +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
Potentilla hispidula +
Horkelia hispidula +
Horkelia sect. Hispidulae +
species +
inconspicuous +
enlarged +
reddish +  and grayish green +
hairy +  and inconspicuously conspicuously glandular +