Appertiella C.D.K.Cook & L.Triest genus accepted

Blyxa Noronha ex Thouars genus accepted

Elodea Michx. genus accepted

Enhalus Rich. genus accepted

Halophila Thouars genus accepted

Hydrilla Rich. genus accepted

Hydrocharis L. genus accepted

Lagarosiphon Harv. genus accepted

Najas L. genus accepted

Nechamandra Planch. genus accepted

Ottelia Pers. genus accepted

Stratiotes L. genus accepted

Thalassia Banks & Sol. ex K.D.Koenig genus accepted

Vallisneria P.Micheli ex L. genus accepted