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Annual herb from a taproot; stems erect, 0.4-1.2 m tall, freely branched, sparsely to densely hairy with spreading hairs or the hairs pointing backward, glabrous above.
Broadly deltoid-lanceolate to lanceolate, to 15 cm long, short-stalked, pinnately-cut, the segments pointing backwards, usually with large, long-pointed, terminal lobes irregularly saw-toothed to toothed.
Racemes to 40 cm long in fruit; petals lemon yellow, 6-8 mm long, broadly egg-shaped with long narrow claw; sepals about 3.5 mm long, lanceolate.
Siliques, ascending to erect but not appressed, straight or slightly arcuate, 2-3.5 cm long, round in cross section, segments prominently 3-nerved; beaks about 0.5 mm long; fruiting stalks spreading to ascending, 7-20 mm long, slender; seeds uniseriate, about 0.7 mm long, not gelatinous when wet.
Source: The Illustrated Flora of British Columbia