Annual herb. Stems weakly ribbed, bearing slightly deflexed short tapered hairs, but ± glabrous above, and below with age, (10)-20-60- (80) cm tall. Lvs serrate to dentate, petiolate, hairy with short tapered hairs. Lower lvs pinnate to pinnatifid or rarely not lobed, (2)-8-20 × (1)-2-7 cm, with a large ovate-oblong terminal lobe and (0)-1-4 pairs of oblong lateral lobes. Upper lvs ovate to linear, 2-5 × 0.5-1.5 cm. Racemes glabrous or hairy, 10-30-(40) cm long. Pedicels erect, 2-4 mm long. Sepals narrow-lanceolate. Petals pale yellow with darker veins, 6-10 mm long; limb elliptic. Silicle erect, hairy or glabrous, weakly to strongly ribbed and rugose; lower segment cylindric or barrel-shaped, 2-3-(5) mm long; upper segment ovoid to turbinate, 2-4 × 2-4-(5) mm, tapering ± abruptly above; style 2-3 mm long. Upper seed c. 2 mm long, lower c. 1 mm long.