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Annual or biennial herb from a fleshy, elongated taproot; stems 0.3-1.2 m tall, simple or branched, sparsely stiff-hairy.
Basal leaves pinnately lobed, 3-20 cm long, 1-8 cm wide, stalked, often round-toothed, terminal segment larger, orbicular; stem leaves reduced upwards.
Inflorescence of spreading to ascending stalks, 8-27 mm long; petals pink, pink-purple to white or yellow with darker venation, 13-20 mm long; sepals 7-11 mm long, glabrous.
Siliques, 2-6 cm long, 5-10 mm wide, continuous or sometimes slightly moniliform, lightly several-grooved, usually not breaking transversely, beaks conical, sharp, 1/4 to 1/2 as long as the body, glabrous; seeds 1-3 (5).
Source: The Illustrated Flora of British Columbia