Page author: David Giblin
Sidalcea hendersonii
Henderson's checker-mallow

Distribution: Occurring west of the Cascades crest in the coastal counties in Washington; southwestern British Columbia to the Umpqua River area in Oregon.

Habitat: On or adjacent to tidelands, coastal marshes.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bumblebees, bees, beetles


Herbaceous perennials from a heavy taproot and short, thick rhizomes, the stems 5-15 dm. tall, hollow, glabrous, and purplish-tinged, as also the stipules, petioles and calyces.


Leaves alternate, palmately veined, the lower rotund and cordate, shallowly lobed, the lobes with rounded teeth; the upper leaves deeply 5-parted, the lobes oblong, with irregular, terminal teeth.


Inflorescence of congested, spikelike, compound racemes; calyx 5 lobed, 8-12 mm. long, enlarging in fruit, the lobes with marginal hairs; petals 5, deep pink, clawed, broadly obcordate and shallowly notched; stamens 40-70, freed from the staminal tube in 2-3 series, the stamens united in groups; ovary superior, the carpels 5-10 in a ring around a central axis; styles equal to the number of carpels, elongate, stigmatic full length.


Capsules 4 mm. long, smooth, with a beak 0.8-1.3 mm. long

Accepted Name:
Sidalcea hendersonii S. Watson
Publication: Proceedings of the American Academy of Arts and Sciences 23(2): 262. 1888.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Sidalcea hendersonii in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Sidalcea hendersonii checklist entry.

OregonFlora: Sidalcea hendersonii information.

E-Flora BC: Sidalcea hendersonii atlas page.

CalPhotos: Sidalcea hendersonii photos.

USDA Plants: Sidalcea hendersonii information.

15 photographs:
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