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Annual or biennial herb from a taproot; stems mostly single, erect, branched above, leafy to the inflorescenses, 20-50 cm tall, spreading short-hairy.
Basal leaves in a rosette, oblanceolate, stalked, entire to pinnately cut with a large terminal lobe, 5-7 cm long, to 12 mm wide; stem leaves numerous, arrowhead-shaped, minutely toothed, unstalked, upper strongly ear-like and clasping at the base.
Inflorescence of often compound racemes; flower stalks widely spreading, 4-8 mm long, slightly flattened; petals white, about 2 mm long, narrowly spoon-shaped; sepals often pinkish, about 1.5 mm long, nearly glabrous to long-hairy; stamens 6; anthers yellow.
Silicles, oblong egg-shaped, 5-6 mm long, 4 mm wide, covered with white blisters, otherwise glabrous to short-hairy, margins and tips broadly winged, the tips slightly notched; beaks 0.2-0.6 mm long, included to slightly exserted at the shallowly notched tips; seeds 2.5-3 mm long.
Source: The Illustrated Flora of British Columbia