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General:
Biennial herb from a taproot; stems erect, 0.2-1.5 (2.1) m tall, usually freely branched, solid, glabrous and somewhat glaucous.
Leaves:
Basal and lower stem leaves lanceolate to deltoid-lanceolate, less often oblong to egg-shaped, (4) 6-24 (45) cm long, laciniate to pinnately lobed, long-stalked; stem leaves numerous, reduced upwards, lanceolate to linear-lanceolate, often long-pointed, entire to toothed or laciniate, stalked, glabrous and somewhat glaucous.
Flowers:
Inflorescences densely flowered racemes, usually branched, slightly elongate in fruit; flower stalks horizontal to spreading, (1.5) 2.5-6.5 (15) mm long, straight or sometimes curved, stout, often flattened at base; calyces tubular to campanulate; petals white to purplish, 6-20 mm long, linear to narrowly spoon-shaped; sepals greenish-white to purplish, 3.5-7 mm long, slightly or not at all pouched at the base.
Fruits:
Siliques, widely spreading to ascending, 3-10 (12) cm long, about 1 mm thick, straight to strongly curved, very slightly flattened; beaks (0.5) 1-3 (4) mm long.
Source: The Illustrated Flora of British Columbia
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