Annual to perennial taprooted herbs. Hairs simple or 0. Stems procumbent to erect, leafy. Lvs simple, the upper amplexicaul. Racemes ebracteate. Sepals erect or spreading, not saccate. Petals white to purple. Stamens 6, without appendages. Lateral nectaries 4, paired beside bases of lateral stamens; median nectaries 0. Silicle obcordate, angustiseptate, dehiscent; valves keeled and usually winged, sometimes the wings extended to form an apical notch to the silicle. Style long or short; stigma capitate to somewhat 2-lobed. Seeds ovoid, not winged, 1-8 per locule.