Annual or biennial herb from a slender, whitish taproot; stems 30-80 cm tall, freely branched above, sparsely stiff-hairy
Basal leaves pinnately cut with the terminal lobe largest, 6-20 cm long, 1-4 pairs of distant lateral lobes; stem leaves several, reduced, stalked.
Inflorescence of ascending flower stalks, 1-2.5 cm long; petals yellow fading to white, often purplish-veined or -tinged, 15-20 mm long, twice the length of sepals.
Siliques, 4-8 cm long (including the 1-2 cm beaks), 3-6 mm wide, moniliform, finally breaking between the 1-seeded segments, prominently several-grooved lengthwise; seeds 4-12.
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: The Illustrated Flora of British Columbia