Annual to perennial taprooted herbs. Hairs simple or 0. Stems procumbent to ascending. Lvs entire or 1-2-pinnatifid. Racemes ebracteate, lf-opposed. Sepals ± spreading, not saccate. Petals either white and inconspicuous, or 0. Stamens 2, 4, or 6, without appendages. Lateral nectaries 0-4, at bases of lateral stamens; median nectaries 2, one outside each median pair of stamens. Silicle small and broad, emarginate or not, angustiseptate, indehiscent or breaking into two 1-seeded segments; valves warty or prominently veined. Seeds ovoid, not winged.