Flora of North America species comparison

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Sidalcea oregana var. calva

Sidalcea oregana subsp. valida
Sidalcea oregana var. calva

Oregon checkermallow
Photo is of parent taxon

Kenwood Marsh checkerbloom
Habit Plants 0.9–1.2(–1.5) m, with thick, ± fleshy roots or rootstock.
Stems

decumbent-based, base often rooting, branched or not, solid, often hollow in age, 5–10 mm diam. near base, base usually bristly-hirsute, sometimes with minute stellate hairs, bristle hairs 1–1.5 mm, becoming glabrate distally.
Leaves

stipules linear or lanceolate, 4–longer than pedicels, shorter than calyx.
Pedicels

1–2 mm.
Flowers

bisexual or unisexual and pistillate, plants gynodioecious;

calyx 7.5 mm, accrescent, finely stellate-puberulent, sparsely, if at all, bristly;

petals dark rose-pink to pink-lavender, 10–15 mm;

staminal column 4–6 mm, hairy;

anthers white;

stigmas (6 or)7 or 8.
Seeds

1.5–2.5 mm.
Schizocarps

5–6 mm diam.;

mericarps (6 or)7 or 8, 3 mm, sparsely glandular-puberulent, smooth, mucro 0.5 mm.
2n

= 20.

Sidalcea oregana var. calva

Sidalcea oregana subsp. valida
Phenology Flowering Jun–Sep.
Habitat Marshes
Elevation 100–200 m (300–700 ft)
Distribution
from FNA
CA
[BONAP county map]
Discussion

Of conservation concern.

Subspecies valida is known from a small area and is threatened by grazing and marsh alteration. It is found in freshwater marshes near Kenwood, southern outer North Coast Ranges in Sonoma County. It has been listed as endangered in California and also federally. It is similar to subsp. hydrophila except in overall size, spike length, number of flowers, and indument patterns as well as range and habitat. The somewhat fleshy roots are a reflection of its marshy habitat; it is not closely related to the other fleshy-rooted Sidalcea species.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 351.
Parent taxa Malvaceae > subfam. Malvoideae > Sidalcea > Sidalcea oregana
Sibling taxa
S. oregana subsp. eximia, S. oregana subsp. hydrophila, S. oregana subsp. oregana, S. oregana subsp. spicata, S. oregana subsp. valida
S. oregana subsp. eximia, S. oregana subsp. hydrophila, S. oregana subsp. oregana, S. oregana subsp. spicata
Synonyms S. valida, S. spicata subsp. valida
Name authority (Greene) C. L. Hitchcock: Perenn. Sp. Sidalcea, 67. (1957)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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