1 gen., widespread in fresh water

Ceratophyllum L.

1 species native Aust.; all states and territories except Tas.

*Ceratophyllum demersum L.

Submerged, aquatic, monoecious, perennial herb. Leaves whorled and divided dichotomously into linear denticulate segments; stipules absent. Flowers unisexual, minute, solitary in leaf axils. Sepals 10–15, basally connate. Stamens 10–20 on a flat receptacle. Ovary 1-locular, superior, with a single pendulous ovule. Fruit a nut. Coast. Commonly grown in aquaria and rarely naturalized in the area