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Annual or biennial herb from a taproot; stems 30-100 cm tall, usually branched above, occasionally from the base; finely starlike-hairy, often greyish, sometimes with some simple hairs.
Basal leaves few; stem leaves very deeply twice or thrice pinnately lobed to twice or thrice compound, oblanceolate to widely egg-shaped, short-stalked, 2-10 cm long, ultimate lobes of leaves generally linear.
Racemes elongated; flower stalks slender, ascending, 7-14 mm long, less than half the length of the siliques; petals pale yellow, needle-like, spoon-shaped, about length of sepals; sepals 2-2.5 mm long, greenish or yellowish.
Siliques, nearly erect, linear, 11-33 mm long, 1-1.5 mm wide, inconspicuously constricted between the seeds, rounded at tip; seeds (12) 15-25 per chamber in one row, 0.7-1.5 mm long, oblong-elliptic.
Source: The Illustrated Flora of British Columbia