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Annual herb from a taproot; stems 0.2-1.0 m tall, freely branched, coarsely short-hairy to nearly glabrous, hairs sharp and bristlelike.
Basal leaves pinnately lobed into 3-7 segments, coarsely-toothed, 8-20 cm long, 5-15 cm wide, the terminal lobe largest; reduced above, often just wavy-margined or lobed.
In open terminal clusters, 10-30 cm long; flower stalks 5-10 mm long, spreading; petals pale yellow to whitish, 10-15 mm long; sepals 4-5 mm long.
Siliques, spreading to slightly ascending, often curved, 3-4 cm long, 3.5-4.5 mm wide, 3-nerved, coarsely short-hairy, few-seeded, often constricted between seeds; styles beaked, conspicuously flattened; seeds 3-8, minutely honeycombed, about 3 mm long.
Source: The Illustrated Flora of British Columbia