Annual or biennial, 30-90 cm tall, erect, branched, hairy with simple and branched hairs below, and usually almost glabrous above. Leaves (2-) 3-pinnatisect, 5-15 cm long, stalked; lobes usually 1-2 mm broad, linear or oblong; upper most leaves sessile or subsessile, ± similar. Racemes 40-80-flowered, up to 30 cm long in fruit. Flowers 2-3 mm across, yellow; pedicels usually 10-15 mm long in fruit, filiform, ascending, glabrous. Sepals c. 2 mm long. Petals c. 2.5 (-4) mm long, 0.5-1 mm broad, rarely very reduced or abortive. Stamens c. 2: 2.5 mm long; anthers c. 0.5 mm long. Siliquae linear, 15-35 mm long, c. 1 mm broad, often upcurved, glabrous, obscurely torulose; valves subconvex, 1-veined; stigma depressed-capitate, subsessile; seeds many, c. 0.7 mm long, reddish-brown; septum veined.