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Spathellas (spathaceous bracts) in clusters along the stems, ovoid to subspherical, rupturing irregularly at the apex at anthesis; flower inverted (reflexed) within the spathella before anthesis.
Ovary spherical, 1-locular with central placentation, borne on a well developed gynophore and surmounted by 2 free styles; placentas globular, bearing numerous anatropous ovules.
Stamens 2(3); filaments joined for at least half their length; anthers 2-locular, introrse; pollen in monads.
Submerged freshwater herbs; basal part thalloid, foliaceous or ribbon-like.
Capsule smooth, globose, dehiscing into 2 equal caducous valves.
Pedicel long-exserted after anthesis, bearing the flower erect.
Tepals 2, minute, one on each side of the andropodium.
Seeds numerous, small, red-brown, testa reticulate.
Leaves dichotomously branched, segments linear.
Stems long, simple or divaricately branched.