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White Mountain horkelia, White Mountains. horkelia

Barton Flats horkelia, Barton Flats or wilder's horkelia

Habit Plants 0.7–3 dm diam. Plants forming rosettes.
Stems

ascending to erect, 1–2.5 dm.

prostrate to decumbent, (0.5–)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.

(3–)4–8(–10) × 0.8–1.8 cm;

leaflets (3 or)4–7 per side, narrowly to broadly obovate, 3–10 × 3–10 mm, ± as wide as long, divided 1/2–3/4 to midrib into 5–15 narrowly oblong teeth or lobes, pilose especially on midveins and margins.

Cauline leaves

3–7.

(0–)1(–2).

Pedicels

2–8(–12) mm.

3–15 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.

5 mm diam.;

epicalyx bractlets lanceolate to ovate, 0.8–1.7 × 0.3–0.7 mm, 1/2–2/3 length of sepals;

hypanthium 1–1.5 × 1.5–3 mm, ± 1/2 as deep as wide;

sepals reflexed, broadly elliptic to broadly ovate, 1.7–2.5 mm;

petals oblanceolate to oblong, 2–3 × 1–2 mm, apex rounded;

filaments 0.5–1 × 0.3–0.8 mm, anthers 0.4–0.5 mm;

carpels 3 or 4;

styles 1–2 mm.

Achenes

brown to dark brown, 1.5–2 mm.

tan, 1.8–2.2 mm, coarsely rugose.

Horkelia hispidula

Horkelia wilderae

Phenology Flowering summer. Flowering summer.
Habitat Dry, rocky alpine flats, in subalpine conifer woodlands Chaparral flats, hills, adjacent to montane conifer woodlands
Elevation 3000–3400 m (9800–11200 ft) 1900–3000 m (6200–9800 ft)
Distribution
from FNA
CA; NV
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Of conservation concern.

Horkelia wilderae is known from the Barton Flats area of the eastern San Bernardino Mountains, San Bernardino County.

Some morphological characteristics (small flowers, reflexed sepals) may indicate a closer relation to Horkelia fusca than to H. parryi.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 9, p. 249. FNA vol. 9, p. 258.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Horkelia > sect. Hispidulae Rosaceae > subfam. Rosoideae > tribe Potentilleae > Horkelia > sect. Parryae
Sibling taxa
H. bolanderi, H. californica, H. clevelandii, H. congesta, H. cuneata, H. daucifolia, H. fusca, H. hendersonii, H. howellii, H. marinensis, H. parryi, H. rydbergii, H. sericata, H. tenuiloba, H. tridentata, H. truncata, H. tularensis, H. wilderae, H. yadonii
H. bolanderi, H. californica, H. clevelandii, H. congesta, H. cuneata, H. daucifolia, H. fusca, H. hendersonii, H. hispidula, H. howellii, H. marinensis, H. parryi, H. rydbergii, H. sericata, H. tenuiloba, H. tridentata, H. truncata, H. tularensis, H. yadonii
Synonyms Potentilla hispidula Potentilla parryi var. wilderae, P. wilderae
Name authority Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 278. (1908) Parish: Bot. Gaz. 38: 460. (1904)
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