Annual, up to 20 (-30) cm long, procumbent, sometimes much smaller and erect, branched or simple, with stem and branches filiform, slender. Basal leaves usually ± rosulate, deeply dissected to entire, oblong-elliptic, shortly stalked to sessile, 10-40 mm long, (2-) 5-10 mm broad, glabrous or sparsely pubescent; upper leaves smaller, sessile but cuneate at base. Racemes (5-) 15-30-flowered, lax, increasing up to 10 cm in fruit. Flowers minute, c. 1.5 mm across, white; pedicels 2.5-8 (-12) mm long in fruit, spreading. Sepals c. 1 mm long, 0.5 mm broad. Petals hardly as long as the sepals. Stamens c. 0.8: 1 mm long. Siliculae ellipsoid, (2.5-) 3-4.5 mm long, (1-) 1.5-2 mm broad, apex blunt or slightly emarginate, glabrous; septum c. 1 mm wide; seeds usually 6 in each locule, c. 0.6 mm long, 0.4 mm broad, ellipsoid, pale brown.