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Cuesta Pass checker, Cuesta Pass checkerbloom

Habit Plants often mound-forming, 0.3–0.6 m, with taproot.
Stems

usually crowded in older plants, erect to ascending, usually reddish, grayish stellate-hairy, hairs coarse, longest 1.5 mm.

Leaves

stipules wide-lanceolate to ovate, 6–8 × 2.5–3 mm;

petiole 3–6 cm, 1–3 times as long as blade;

blades on proximal portion of stem rounded, those distally with wide sinus, deeply, palmately (3–)5–7-lobed, incised ± to base, 2–6 × 2–6 cm, narrowed to base, margins crenate-dentate, surfaces coarsely stellate-hairy.

Inflorescences

open, usually branched, 10–20 cm;

bracts distinct, ovate-lanceolate to ovate, (7–)10–12 mm, 3–4 times longer than pedicels, equaling or shorter than calyx.

Pedicels

1–4 mm, obscured by bracts;

involucellar bractlets 3, 8–10 mm, ± equaling calyx.

Flowers

bisexual or pistillate, plants gynodioecious;

calyx 10–12 mm, densely long-bristly;

petals pinkish lavender, veins often paler, 12–15 mm;

staminal column 6–7 mm, hairy;

anthers white to pale pinkish;

stigmas usually 6.

Seeds

1.5–2 mm.

Schizocarps

5–6 mm diam.;

mericarps usually 6, (1.5–)2–2.5 mm, smooth except for dorsal-medial line and several transverse corrugations especially at margins.

Sidalcea hickmanii subsp. anomala

Phenology Flowering Apr–May(–Jun).
Habitat Closed-cone conifer forests and chaparral, usually serpentine
Elevation 600–800 m (2000–2600 ft)
Distribution
from FNA
CA
[BONAP county map]
Discussion

Of conservation concern.

Subspecies anomala is known from the vicinity of Cuesta Pass, outer South Coast Ranges, San Luis Obispo County, and is distinctive in its hemispheric-mounding habit, deeply palmately lobed leaves, and relatively large bracts that equal the calyx in length. It is listed as endangered in California and is occasionally cultivated.

Subspecies anomala is in the Center for Plant Conservation’s National Collection of Endangered Plants.

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

Source FNA vol. 6, p. 336.
Parent taxa Malvaceae > subfam. Malvoideae > Sidalcea > Sidalcea hickmanii
Sibling taxa
S. hickmanii subsp. hickmanii, S. hickmanii subsp. napensis, S. hickmanii subsp. parishii, S. hickmanii subsp. petraea, S. hickmanii subsp. pillsburiensis, S. hickmanii subsp. viridis
Name authority C. L. Hitchcock: Perenn. Sp. Sidalcea, 79. (1957)
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