| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Hydrocharitaceae | Blyxa | Blyxa | |||
| Hydrocharitaceae | Egeria | South American Waterweed |  | ||
| Hydrocharitaceae | Elodea | Waterweed |  | ||
| Hydrocharitaceae | Halophila | Seagrass | |||
| Hydrocharitaceae | Hydrilla | Hydrilla |  | ||
| Hydrocharitaceae | Hydrocharis | Frog's-bit |  | ||
| Hydrocharitaceae | Limnobium | Frog's-bit | |||
| Hydrocharitaceae | Najas | Naiad, Bushy-pondweed, Water-nymph |  | ||
| Hydrocharitaceae | Ottelia | Duck-lettuce | |||
| Hydrocharitaceae | Thalassia | Turtlegrass | |||
| Hydrocharitaceae | Vallisneria | Water-celery, Eelgrass |  |