aquatics, free floating or submerged. Fronds either solitary, or coherent
together in groups of 2-10, round or oblong, daughter fronds budding from
lateral pouches, connected to mother frond by a thin, white stipe, budding
pouches 2, one on either side of the axis. Inflorescence 1, consisting of 1
female and 2 male flowers, enclosed by membranous spathe, anther bilocular.
Female flowers superior, lateral to the two male flowers, ovary globular, style
1, ovule1. Fruit symmetric or
asymmetric. Seeds longitudinally ribbed.