Annual, 5-20 (-45) cm tall, erect, simple or branched, usually from the base, often hairy below and suhglabrous above with short, branched or simple hairs. Basal leaves rosulate, obovate-oblong, 15-50 mm long, 5-10 mm broad, subsessile, slightly to distinctly toothed or entire; upper leaves, short, distant, oblong or linear, cuneate below. sessile. entire or obscurely toothed. Racemes (8-) 15-30 (-40)-flowered, up to 20 cm long in fruit. Flowers 2-3 mm across, white or pale pinkish; pedicels (5-) 8-15 mm long in fruit, filiform, subspreading or ascending. Sepals 1.5-2 mm long. Petals 3-4 mm long, 1 mm broad. Stamens 6 or 4, c. 1.5: 2.5 mm long (outer 2 sometimes suppressed) ; anthers c. 0.5 mm long. Siliquae (10-) 12-18 mm long, 1 mm broad, linear, subcylindrical, often somewhat upcurved, glabrous; valves 1-veined; stigma short, depressed, sub-sessile or on c. 0.5 mm long style; septum not veined; seeds usually 20-30 in each locule, c. 0.5 mm long.