floating, gregarious, stemless, stoloniferous herbs, with spreading feathery roots.
Leaves sessile, obovate-cuneate, severel in rosette. Inflorescence solitary,
very small. Spathe small, shortly peduncled, tubular below, open above. Spadix
adnate to back of spathe-tube, free above. Male zone : stamens few, beneath
spadix-apex, slits vertical. Neuters : minute, connate in a ring below the
males. Female zone : ovary conico-ovoid, 1-celled, style conical, stigma discoid, ovules numerous, basal or
subparietal, orthotropous. Fruit berry, membranous, few-seeded. Seeds few,
oblong or obovoid, testa rugose.