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Lake Pillsbury checkerbloom

Habit Plants greenish, 0.1–0.4 m, with small, erect, branched caudex and taproot.
Stems

erect, green, stellate-hairy, hairs appressed, moderately dense, uniform, 0.2–0.5 mm.

Leaves

stipules wide-lanceolate, 3 × 1.3 mm;

petioles of midstem leaves 0.6–2 cm, 1/2 times to as long as or longer than blade;

blade broadly flabelliform, usually truncate, sometimes wide-cuneate, unlobed, 0.6–1.5 × 0.7–2.2 cm, margins coarsely crenate, surfaces tufted-stellate-hairy.

Inflorescences

open, not spiciform, unbranched, to 10 cm, to 10-flowered, proximal flowers solitary, axillary;

bracts 2 in proximal flowers, 1 in distal flowers, distinct, oblong, narrow, cupped, 3 × 1.2 mm, narrowest at base, longer than pedicels, much shorter than calyx.

Pedicels

2 mm, usually not obscured by bracts;

involucellar bractlets 3, oblong, 3 mm, 1/2 as long as calyx.

Flowers

bisexual;

calyx 4–5 mm, to 5.5 mm in fruit, densely stellate-puberulent, hairs 0.1–0.6 mm diam.;

petals pale pink, slightly pale-veined, 8–10 mm;

staminal column 5 mm, minutely puberulent;

anthers white;

stigmas (4–)6 or 7.

Seeds

1–1.5 mm.

Schizocarps

4–5 mm diam.;

mericarps usually (4–)6 or 7, 1.5–2 mm, side walls smooth, back and margins with 2–5 corrugations.

Sidalcea hickmanii subsp. pillsburiensis

Phenology Flowering (Jun–)Jul–Aug.
Habitat Chaparral, ephemeral drainages
Elevation 700–800 m (2300–2600 ft)
Distribution
from FNA
CA
[BONAP county map]
Discussion

Subspecies pillsburiensis is known from a single population near Lake Pillsbury, North Coast Ranges, Lake County. It appears to be a dwarf most closely related to subsp. viridis and differing in its lower stature, undivided (non-two-fid) bracts, fewer flowers, and less conspicuous, appressed indument.

Of conservation concern.

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

Source FNA vol. 6, p. 337.
Parent taxa Malvaceae > subfam. Malvoideae > Sidalcea > Sidalcea hickmanii
Sibling taxa
S. hickmanii subsp. anomala, S. hickmanii subsp. hickmanii, S. hickmanii subsp. napensis, S. hickmanii subsp. parishii, S. hickmanii subsp. petraea, S. hickmanii subsp. viridis
Name authority S. R. Hill: J. Bot. Res. Inst. Texas 2: 786, figs. 2 – 4. (2008)
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