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Biennial or perennial from a stout taproot; stems erect, 0.4-1.2 m tall, simple below, branched above, glabrous, somewhat glaucous.
Basal leaves several, clustered, oblanceolate to elliptic-oblanceolate, long-stalked, toothed or wavy-margined, to 18 cm long, soft-hairy on the margins to sparsely soft-hairy with simple hairs; stem leaves lanceolate to elliptic, unstalked, with ear-like basal lobes, mostly entire, glabrous.
Racemes compound, numerous; flower stalks slender, conspicuously enlarged below flowers, usually reflexed; petals yellow, about 3.5 mm long, spoon-shaped.
Oblong to oblong-oblanceolate, 8-18 mm long, 5-7 mm wide, glabrous, blackish; fruiting stalks somewhat shorter than the silicles; seeds yellowish, ellipsoidal, about 3 mm long.
Source: The Illustrated Flora of British Columbia