Annual or biennial, tall glabrous glaucous herbs, sometimes hairy below with forked somewhat stiff hairs. Radical leaves oblong-obovate, shortly stalked; cauline leaves oblong-ovate, saggitate-amplexicaul, glabrous. Racemes many flowered. Flowers mediocre, white or pale yellow; pedicel usually erect, somewhat appressed in fruit. Siliquae long, slender, erect, somewhat terete-compressed, bilocular dehiscent; valves with a conspicuous mid-rib; septum with deep depressions caused by seeds, not veined; seeds many, 1-2 seriate; radicle sometimes obliquely accumbent.