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Annual or biennial herb from a taproot; stems single or diffusely branched above, 10-40 cm tall, decumbent to ascending, glabrous to sparsely hairy throughout, the hairs appressed.
Variable, 2-7 cm long, 8-20 mm wide, oblong to oblanceolate, toothed, lobed or pinnately-cut, the segments linear to egg-shaped, entire or toothed, glabrous or short-hairy; stem leaves reduced upwards, clasping with earlike lobes basally.
Inflorescence of 1-5 (7) mm long, spreading to ascending or slightly recurved stalks; petals yellow, 1-2 mm long; sepals 1-2 mm long, often spreading, promptly deciduous or somewhat persistent until the siliques are well formed, glabrous.
Siliques, linear to oblong, 6-15 mm long, 1-1.5 mm wide, curved upward to sometimes straight, nearly round in cross section, 2-carpelled; beaks 0.3-1 mm long; seeds finely pimpled.
Several poorly defined varieties are sometimes recognized, but are not treated here.
Source: The Illustrated Flora of British Columbia