| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Hydrocharitaceae | Elodea canadensis | Common Waterweed | Rivers, lakes, ponds, stagnant waters of streams. | QC west to SK, south to NC, Panhandle FL, n. AR, OK, NM, and CA, the southern distribution perhaps only introduced. |  |
| Hydrocharitaceae | Elodea nuttallii | Nuttall's Waterweed, Free-flowered Waterweed | Lakes, ponds, stagnant waters of streams. | ME and QC west to MN and ID, south to NC, TN, OK, and NM. |  |
| Hydrocharitaceae | Elodea schweinitzii | Schweinitz's Waterweed | Rivers. | NY, n. NJ, and e. PA; perhaps extinct. |