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General:
Biennial (rarely perennial) from a taproot and a simple stem-base; stems (20) 30-80 cm tall, stiff, erect, angled and branched.
Leaves:
Basal leaves pinnately lobed, long-stalked, less than 12 cm long, with 4-10 pairs of lateral lobes, terminal lobe largest, egg-shaped and entire or irregularly toothed; stalks glabrous or long, fringed-hairy; lowermost stem leaves with 2-10 pairs of lateral lobes, upper pinnately cleft with the terminal lobe the largest, often clasping the stem.
Flowers:
In single and terminal racemes or more often in compound, reduced racemes in lower leaf axils; flower stalks stout, more than 1 mm thick, 2-3 mm long; petals bright yellow, broadly spoon-shaped, 6-8 mm long; sepals pale yellow-green, about 2 mm long.
Fruits:
Erect to spreading-ascending siliques, 4.5-8 cm long, straight or nearly straight; styles 0.5-1.5 mm long, not beaklike; seeds 1-1.5 mm long, greyish-brown.
Source: The Illustrated Flora of British Columbia
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