Annual or biennial, 30-100 cm tall, erect, branched, subglabrous. Lower leaves lyrate, 1-2-jugate, rarely subentire, shortly petioled; terminal lobe ovate-oblong, distantly toothed; lateral lobes smaller but similar, dentate to sub-entire; upper leaves gradually becoming smaller and linear, subsessile to sessile; all leaves subfleshy. Racemes 20-50(-60)-flowered, up to 25 cm long in fruit. Flowers c. 5 mm across, yellow; pedicels 5-10 mm long in fruit, spreading horizontally, slightly thickened. Sepals 3-4 mm long. Petals (5-) 6-8 mm long, 1.5 mm broad. Stamens c. 3:5 mm long; anthers c. 1.5 mm long. Siliquae linear, subcylindrical, slightly downcurved, horizontally spreading, 50-100 mm long, 1 mm broad, glabrous; valves submembranous, 3-veined; style c. 1(4.5) mm long, thickened with depressed, capitate stigma; seeds many, c. 1 mm long, oblong, brown, finely granulate; radicle incumbent (sometimes accumbent), variable.