The root stalks are fleshy and starchy and may be eaten for food, but in general teh family is important as an oxigenator of aquatic systems and a food source for aquatic mammals and birds. Fossils in the Paleocene. Inflorescence an axillary or terminal fleshy spike.
Placentation is basal to marginal.
Fruit an achene or drupe. Seeds with endosperm lacking. Leaves may be submerged or floating and have a stipule like sheathing at the base.