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Annual herb from a taproot; stems erect, 0.2-1.5 m tall, freely branched, sparsely to heavily stiff-hairy near the base but usually glabrous above.
Basal leaves broadly lanceolate to oblanceolate, 3-20 cm long, 0.8-5 cm wide, stalked; lower stem leaves lobed or pinnately-cut, toothed; upper stem leaves with lobes or leaflets threadlike to linear.
Inflorescence of spreading or ascending stalks, 4-10 mm long, stout; petals pale yellowish, 6-8 mm long; sepals 3-4.5 mm long, glabrous, outer 2 with erect horns at tip.
Siliques, spreading, linear, 5-10 cm long, 1-2 mm wide, about same diameter as fruiting stalks, round in cross section, rigid and branchlike; segments with prominent midnerve, evident lateral nerves; stylar beaks none; seeds uniseriate, about 1 mm long, slightly gelatinous when wet.
Source: The Illustrated Flora of British Columbia