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General:
Annual herb from a taproot; stems erect, 10-30 cm tall, branched, short soft-hairy.
Leaves:
Basal leaves clustered, withering before flowering, deeply pinnately lobed or compound, long-stalked with large terminal lobe and about 4 pairs of broadly triangular lateral lobes; stem leaves with linear, arrowhead-shaped terminal lobe and fewer and smaller lateral lobes; upper stem leaves more or less entire or with lobes or leaflets lanceolate to triangular.
Flowers:
Inflorescences much elongating in fruit; petals pale yellow, 8-10 mm long, twice length of sepals.
Fruits:
Siliques, 3-10 cm long, 1-2 mm wide, straight, round in cross section, stiff-hairy becoming glabrous at maturity; segments 3-nerved; fruiting stalks ascending to erect, 3-6 mm long, stout, about as thick as the silique; beaks 1-3 mm long, club-shaped; seeds yellowish-brown, uniseriate, narrowly egg-shaped, about 0.9 mm long.
Source: The Illustrated Flora of British Columbia
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