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

Clarkia rhomboidea Douglas ex Hook.
common clarkia (diamond clarkia)
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants

© Curtis Bjork  Email the photographer   (Photo ID #22001)

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Distribution of Clarkia rhomboidea
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Species Information

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Annual herb from a slender taproot; stems 15-100 cm tall, usually simple, short stiff-hairy.
Few, mostly somewhat opposite, elliptic to lanceolate, 2-7 cm long, 5-20 mm wide, entire to finely toothed; stalks slender, 1-3 cm long.
Inflorescence a few-flowered, short raceme, buds nodding; hypanthium 1-3 mm long, scaly and white-hairy at the base of the stamens; corollas wheel-shaped, slightly irregular; petals rose-purple and often purple-dotted, 5-10 mm long, 3-6 mm wide, claw 2-lobed, the blade lance- to widely egg-shaped or diamond-shaped; sepals usually free; fertile stamens 8, all alike; stigmas oval, about 0.5 mm long, white to purple; styles not exceeding stamens.
Capsules, 1.5-3.3 cm long, short-beaked.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry, open areas in the lower montane zone; rare in SE BC east of the Coast-Cascade Mountains, known only from Trail and Pend d'Oreille River; S to ID, UT, AZ 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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References