E-Flora BC: Electronic Atlas of the Flora of British Columbia

General:
Annual herb from a taproot; stems 30-100 cm tall, simple to freely branched, hairy with awl-like or bristlelike hairs throughout or just on lower stem.

Leaves:
Basal leaves variable, from simple and wavy-margined and toothed to pinnately cleft with the terminal lobe the largest, 5-15 cm long; upper stem leaves simple.

Flowers:
In compound terminal clusters, to 30 cm long, flower stalks stout, 2-6 mm long, erect or ascending; petals yellow, 8-14 mm long; sepals 4-5 mm long.

Fruits:
Siliques, glabrous or somewhat hairy, straight or slightly curved, (3) 4-5 cm long, 2 mm wide, often constricted between seeds; styles beaked, conspicuously flattened, about 2 mm long; seeds 7-12, about 2 mm long, finely honeycombed.