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Annual herb from a taproot; stems ascending to erect, several, simple or branched, white-shiny, usually somewhat barbed throughout, sometimes becoming glabrous, 10-40 cm tall.
Basal leaves linear to shallowly lobed, 2-11 cm long; stem leaves alternate, often pinnatifid, linear to lanceolate, 2-11 cm long, lobed or unlobed, unstalked and entire to few-toothed above.
Inflorescence of few, unstalked flowers in a tight, terminal cluster; petals 5, yellow, 3-6 mm long; calyces 1-2 cm long, hairy, the lobes 2-4 mm long; stamens shorter than the petals; bracts egg-shaped.
Capsules, linear, 1-3 cm long; seeds 15-30, obscurely rough-pimply, appearing glabrous under 10x magnification, not flattened.
Source: The Illustrated Flora of British Columbia