Discoid, floating aquatics. Roots short, 3-18, clustered. Thalli solitary or a few cohering temporarily, reniform to rounded or obovate, flat or inflated, often reddish below; nerves 3-15. Budding pouches 2. Inflorescence of 1 female and 2 male flowers enclosed in a membranous spathe. Anther 2-thecous. Seeds longitudinally ribbed or smooth. Worldwide: 4 species, cosmopolitan Botswana: 1 taxon. |
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| Species | FZ divisions | Content |
| polyrrhiza (L.) Schleid. | N |