Glabrous, glaucous annual with single stem highly branched above, 4-10 dm tall; lower leaves entire or rarely denticulate, up to 6 cm long and rarely to 1.5 cm wide; upper leaves lanceolate to narrowly linear; inflorescences few-flowered, terminating slender branches; petals white, 3-3.5 mm long; fruiting pedicels slender, spreading at right-angles or slightly ascending, 8-11 mm long; siliques erect, torulose, 1.5-2.5 cm long.