Annual, erect, 10-30 (-40) cm tall, branched, ± hairy below and glabrous above. Leaves simple, scattered, lower spathulate, upper lanceolate or oblong¬cuneate, ± sparsely dentate towards the apex. Flowers c. 1 cm across, white or pale violet; pedicel filiform, spreading or ascending, usually c. 1 cm long. Petals prominently unequal, outer 2 nearly twice as long as sepals, 5-8 (-10) mm long, obovate-oblong, cuneate below. Siliculae c. 5 (-7) mm in diam., suborbicular, apex deeply notched; wings slightly broadening upwards; style as long as or slightly exceeding the apical notch; valves reticulately veined; seed c. 3 mm long, broadly ovate, slightly winged below, reddish-brown.