Annual or perennial taprooted herbs, sometimes woody below. Hairs simple or 0. Stems procumbent to erect, leafy. Lvs simple, toothed or entire, or pinnatifid. Racemes ebracteate, corymbose. Sepals erecto-patent, not saccate. Petals unequal, white, pink or purple, anterior pair > posterior pair. Stamens 6, without appendages. Lateral nectaries 4, paired at bases of lateral stamens; median nectaries 0. Style long; stigma capitate. Silicle oblong to obovate, angustiseptate, deeply notched, dehiscent; valves keeled, usually winged to form a notch at apex, obscurely veined. Seeds ovoid, winged or not, 1 per locule.