Annual to short-lived perennials, small to medium-sized with taproot. Hairs simple, or forked, or branched. Sepals somewhat spreading, not saccate. Petals white, sometimes reddish or yellowish, ± clawed, rarely absent. Stamens 6; Ovary dorsiventrally flattened, obovate in outline, with 10-40 ovules in each locule. Fruit a silicula, dehiscent, flat, with narrow septum, obtriangular to obcordate, valves keeled. Seeds numerous, not mucilaginous.
Asia-Tropical: Europe: present world: present
About 5 spp., mainly Europe; doubtfully congeneric species in other parts of the world; in Malesia introduced.