Sidalcea hickmanii subsp. viridis

C. L. Hitchcock

Perenn. Sp. Sidalcea, 78. 1957.

Common names: Marin checkerbloom
Conservation concernEndemic
Treatment appears in FNA Volume 6. Treatment on page 338. Mentioned on page 335.

Plants usually greenish, (0.2–) 0.3 (–0.4) m, with taproot and caudex. Stems erect, usually reddish, sparsely stellate-hairy, distally with hairs tufted, not appressed, 0.5–1.2 mm. Leaves: stipules lanceolate, 2–4 × 1–1.5 mm; petiole 1–3 cm, to 1/2–2 1/2 times as long as blade; blade reniform to flabelliform, rounded, usually truncate or with wide sinus, unlobed or very shallowly incised, (1–) 2–4 × 1–2.7 cm, margins coarsely crenate, surfaces stellate-hairy. Inflorescences open, spiciform in age, branched or unbranched, 10+-flowered, 10–20 cm, flowers evenly spaced, proximalmost often solitary, axillary; bracts (1 or) 2, distinct, flat or cupped, distalmost undivided or 2-fid, proximal distinct to base, lanceolate to narrowly oblong, 2–5 × 0.5–1 mm, shorter or longer than pedicels, shorter than calyx. Pedicels 1–3 (–5) mm, usually not obscured by bracts; involucellar bractlets 3, (2–) 3–4 mm, shorter than calyx. Flowers bisexual, probably unisexual and pistillate also, plants gynodioecious; calyx 6–7 mm, densely stellate-puberulent, hair length uniform; petals pink or pale lavender, (5–) 11–14 mm, pistillate smaller; staminal column 4–5 mm, hairy; anthers white; stigmas (4–) 7. Schizocarps 5–6 mm diam.; mericarps usually (4–) 7, 1.5–2 mm, side walls smooth, back and margins with 2–5 corrugations. Seeds 1–1.5 mm.


Phenology: Flowering May–Jun.
Habitat: Dry ridges, with serpentine or serpentinite
Elevation: 300–600 m

Discussion

Of conservation concern.

Subspecies viridis is similar to subsp. hickmanii but is generally smaller in stature, more greenish than grayish green, and has smaller leaves and a more open inflorescence. It is most similar to the dwarf subsp. pillsburiensis. Plants from Mendocino and Sonoma counties reported as this subspecies are usually S. malviflora subsp. rostrata, confused with this because of their generally unlobed leaves; S. malviflora has no involucellar bractlets, has mucronate fruits, and is generally coastal. Subspecies viridis is known only from Carson Ridge, north Central Coast Range, Marin County.

Selected References

None.

Lower Taxa

None.
Steven R. Hill +
C. L. Hitchcock +
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 +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
incised +, unlobed +, rounded +, reniform +  and flabelliform +
1cm;2.7cm +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
distinct +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
shorter or longer +
proximal +  and distalmost +
cupped +  and flat +
lanceolate +  and narrowly oblong +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
slightly longer +
shorter to slightly +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
2-20+-flowered +, unbranched +  and branched +
not +  and overlapping +
stellate-puberulent +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
indehiscent +  and loculicidal +
Marin checkerbloom +
300–600 m +
sparse;copious +
unisexual +  and bisexual +
Dry ridges, with serpentine or serpentinite +
both +  and simple +
uniform +
10+-flowered +, unbranched +, branched +, spiciform +  and open +
ascending +  and erect +
axillary +  and terminal +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
tough-fibrous +
connate +  and distinct +
simple +, stipulate +, sessile +, subsessile +  and petiolate +
reticulate-veined +
entire +  and serrate +
1cm +  and 7cm +
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 +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
adnate +  and distinct +
smaller +
1.1 cm11 mm <br />0.011 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
0-1/2-2-1/2 times as long as blade +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering May–Jun. +
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 />) +
Perenn. Sp. Sidalcea, +
elongated +
5mm +  and 6mm +
hairy +  and glabrous +
reniform +
1mm +  and 1.5mm +
persistent +
Conservation concern +  and Endemic +
sessile +  and subsessile +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
solid +, unbranched +  and branched +
several;many +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
filiform +, linear +  and capitate +
1-2 times number of carpels +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
unbranched +  and branched +
stellate-hairy +
Hesperalcea +
Sidalcea hickmanii subsp. viridis +
Sidalcea hickmanii +
subspecies +
0.5 cm5 mm <br />0.005 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +