Annual, (10-)20-60 cm tall, erect, branched, glabrous or sparsely hairy with simple hairs. Basal and lower leaves petiolate, pinnately lobed with a hastate terminal lobe larger than the laterals, 2-6-jugate, very variable in size; cauline leaves similar but only 1-3-jugate. Racemes 50-80(-100)-flowered, up to 30 cm long in fruit with siliquae overtopping young flowers and buds. Flowers c. 3 mm across, yellow; pedicels (5-)10-15 mm long in fruit, filiform, ascending or sub-spreading, rarely spreading. Sepals 2-2.5 mm long. Petals (2.5-) 3-4 mm long, c. 1 mm broad, usually slightly longer than the sepals. Stamens c. 2:3 mm long; anthers c. 0.5 mm long. Siliquae (25-)30-45 mm long, 1 mm broad, linear, often slightly upcurved; valvex submembranous, convex, obscurely to distinctly torulose, faintly 3-veined but the mid-vein distinct, glabrous; style inconspicuous, thickened, with a depressed, sub-bilobed stigma; septum hyaline; seeds 20-40 in each locule, c. 1 mm long, oblong-ellipsoid, yellowish-brown.