Perennial herbs of wet habitats, with spreading or ascending leafy shoots rooting at the base, glabrous or very sparsely hairy with simple hairs. Leaves pinnate. Racemes lax in fruit, ebracteate. Flowers small, white. Inner sepals slightly saccate at base. Petals about twice as long as the sepals, spathulate. Stamens 6; filaments not appendaged; anthers short, blunt. Lateral nectar glands horse-shoe shaped, open towards the outer side; middle absent. Ovary oblong, 28-40 (-50)-ovuled; style short with capitate stigma. Siliquae sub-cylindrical, bilocular, dehiscent; valves subconvex, membranous, faintly 1-veined, glabrous, often with prominent ridges caused by seeds when pressed and dried; septum membranous, not veined; seeds 1-2-seriate, each with numerous polygonal depressions.