Sidalcea hickmanii subsp. pillsburiensis

S. R. Hill

J. Bot. Res. Inst. Texas 2: 786, figs. 2 – 4. 2008.

Common names: Lake Pillsbury checkerbloom
Conservation concernEndemic
Treatment appears in FNA Volume 6. Treatment on page 337. Mentioned on page 335, 338.

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. 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. Seeds 1–1.5 mm.


Phenology: Flowering (Jun–)Jul–Aug.
Habitat: Chaparral, ephemeral drainages
Elevation: 700–800 m

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.

Selected References

None.

Lower Taxa

None.

"narrowest" is not a number."/2-3timesaslongasblade" is not declared as a valid unit of measurement for this property."elongated" is not a number.

rounded +
Steven R. Hill +
S. R. Hill +
0.2 cm2 mm <br />0.002 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
cordate +, truncate +  and ovate +
widest;1mm;3mm +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
unlobed +, wide-cuneate +  and flabelliform +
0.7 cm7 mm <br />0.007 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
distinct +
3 cm30 mm <br />0.03 m <br /> (?) +
proximalmost +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
slightly longer +
shorter to slightly +
3 cm30 mm <br />0.03 m <br /> (?) +
2-20+-flowered +, unbranched +  and branched +
not +  and overlapping +
stellate-puberulent +
0 cm0 mm <br />0 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
indehiscent +  and loculicidal +
Lake Pillsbury checkerbloom +
700–800 m +
sparse;copious +
Chaparral, ephemeral drainages +
both +  and simple +
0.1mm +  and 0.6mm +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
unbranched +, not spiciform +  and open +
ascending +  and erect +
0 cm0 mm <br />0 m <br /> (10 cm100 mm <br />0.1 m <br />) +
tough-fibrous +
connate +  and distinct +
simple +, stipulate +, sessile +, subsessile +  and petiolate +
reticulate-veined +
entire +  and serrate +
1 cm10 mm <br />0.01 m <br /> (?) +  and 7 cm70 mm <br />0.07 m <br /> (?) +
not pitted +  and corrugated +
thin +, usually wider than long +, 1cm +  and 7cm +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
wedge--shaped +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
3-40-carpellate +
(1-)2-many +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
2 cm20 mm <br />0.02 m <br /> (?) +
adnate +  and distinct +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
1/2 times to as long as or longer than blade +
0.6 cm6 mm <br />0.006 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering (Jun–)Jul–Aug. +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3 cm30 mm <br />0.03 m <br /> (25 cm250 mm <br />0.25 m <br />) +
J. Bot. Res. Inst. Texas +
4mm +  and 5mm +
hairy +  and glabrous +
reniform +
0.1 cm1 mm <br />0.001 m <br /> (?) +  and 0.15 cm1.5 mm <br />0.0015 m <br /> (?) +
persistent +
Conservation concern +  and Endemic +
sessile +  and subsessile +
5 cm50 mm <br />0.05 m <br /> (?) +
solid +, unbranched +  and branched +
stellate-hairy +
several;many +
7 +  and 6 +
filiform +, linear +  and capitate +
1-2 times number of carpels +
3 cm30 mm <br />0.03 m <br /> (?) +
wide-lanceolate +
1.3 cm13 mm <br />0.013 m <br /> (?) +
unbranched +  and branched +
tufted-stellate-hairy +
Hesperalcea +
Sidalcea hickmanii subsp. pillsburiensis +
Sidalcea hickmanii +
subspecies +
0.5 cm5 mm <br />0.005 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
monoecious +, dioecious +  and hermaphroditic +