Hydrocharitaceae is a plant family that includes a number of aquatic plant species, broadly called the Tape-grasses, and includes the well known Canadian Waterweed, Frog's Bit, Elodea, Hydrilla, and Egeria.
The family includes both fresh and marine aquatics. They are found throughout the world in a wide variety of habitats, but most are primarily tropical.
The following genera are usually included in the Hydrocharitaceae.