E-Flora BC: Electronic Atlas of the Flora of British Columbia

Sidalcea hendersonii S. Watson
Henderson's checker-mallow (Henderson's checkerbloom)
Malvaceae (Mallow family)

Introduction to Vascular Plants

© Judith Holm  Email the photographer   (Photo ID #70412)

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Distribution of Sidalcea hendersonii
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Henderson's checker-mallow is a native plant species found in wet meadows, estuaries and tidal flats in southwestern British Columbia.

Species Information

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Perennial herb from a strong taproot and short spreading rhizomes; stems erect or decumbent, hollow, purple-tinged, glabrous or nearly so at the base, 50-150 cm tall.
Basal leaves round or heart-shaped, shallowly lobed, toothed, long-stalked; stem leaves alternate, stalks reduced upwards, palmately 5-lobed into oblong segments; stipules purple-tinged.
Inflorescence of numerous flowers in congested, compound, spike-like, terminal clusters on stalks 1-3 mm long; petals 5, deep pink, 1.5-2 cm long; calyces 9-15 mm long, 5-lobed, glabrous, fringed on the margins, bractlets lacking.
Carpels, 4 mm long, 5-10, nearly glabrous, the beaks about 1 mm long; seeds 1.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Wet meadows, estuaries and tidal flats in the lowland zone; rare on S Vancouver Island, the Gulf Islands and adjacent lower mainland; S to OR.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References