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Annual herb from a taproot; stems sparsely to densely stiff-hairy, 40-150 cm tall, usually branched.
Basal leaves stalked, mostly somewhat pinnately cleft, with the terminal lobe the largest, to wavy-margined and lobed or saw-toothed; stem leaves similar but reduced upward, the uppermost elliptic, wavy-margined or saw-toothed, nearly unstalked and not ear-like at the bases.
In numerous clusters from the leaf axils; flower stalks stout, erect, 3-6 mm long; petals 7-11 (15) mm long, basal portion slender; sepals 3-4 mm long.
Siliques, erect, tightly appressed to stems, 1-2.5 cm long, 1-1.5 mm wide, somewhat quadrangular; beaks smooth; seeds about 2 mm long, minutely honeycombed.
Source: The Illustrated Flora of British Columbia