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

Sidalcea oregana (Nutt. ex Torr. & A. Gray) A. Gray
Oregon checker-mallow (Oregon checkerbloom)
Malvaceae (Mallow family)

Introduction to Vascular Plants

© Reg Newman  Email the photographer   (Photo ID #12115)

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Distribution of Sidalcea oregana
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Sidalcea oregana ssp. oregana

Species Information

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Perennial herb from a stout taproot and a branched crown, without rhizomes; stems erect, not hollow, glabrous to soft-hairy or with star-like hairs, 20-150 cm tall.
Basal leaves heart-shaped, long-stalked, shallowly lobed, toothed; stem leaves alternate, palmately 5-7 lobed into oblong segments, stalks reduced upwards; stipules purple-tinged.
Inflorescence of numerous flowers in open, loose, terminal clusters on stalks 1-10 mm long; petals 5, light pink to deep pink, 1-2 cm long; calyces 3.5-9 mm long, hairy to bristly-hairy or with long hairs up to 2.5 mm long, bractlets lacking.
Carpels, 2.5-3 mm long, 5-10, honeycombed on the sides and back, the beaks 0.3-0.7 mm long; seeds 1.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Late Spring
Fruit/Seed characteristics:
Colour: Brown
Present over the Summer
Source:  The USDA

Habitat / Range

Dry grasslands, shrublands and forest openings in the steppe and lower montane zones; rare in SC BC; S to WY, UT and CA.

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.

Synonyms and Alternate Names

Sidalcea cusickii subsp. purpurea C.L. Hitchc.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References