| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Hydrocharitaceae | Blyxa | Blyxa |  (c) Rainforest, Wairambar - CC-BY | ||
| Hydrocharitaceae | Egeria | South American Waterweed |  (c) Cressler, Alan M. | ||
| Hydrocharitaceae | Elodea | Waterweed |  (c) McNitt, Timothy - CC-BY | ||
| Hydrocharitaceae | Halophila | Seagrass |  (c) Fuller, Richard - CC0 | ||
| Hydrocharitaceae | Hydrilla | Hydrilla |  (c) Horn, Jay | ||
| Hydrocharitaceae | Hydrocharis | Frog's-bit |  (c) Danielson, Erik | ||
| Hydrocharitaceae | Limnobium | Frog's-bit |  (c) Sorrie, Bruce A. - CC-BY | ||
| Hydrocharitaceae | Najas | Naiad, Bushy-pondweed, Water-nymph |  (c) htrommer - CC-BY-NC | ||
| Hydrocharitaceae | Ottelia | Duck-lettuce |  (c) Aravinth - CC-BY | ||
| Hydrocharitaceae | Thalassia | Turtlegrass |  (c) Montes de Oca, Joseph - CC-BY-NC, permission granted to NCBG | ||
| Hydrocharitaceae | Vallisneria | Water-celery, Eelgrass |  (c) Fleming, Gary P. |