| Family | Genus | Species |
|---|---|---|
| Alismataceae | 18 | 142 |
| Aponogetonaceae | 1 | 55 |
| Araceae | 139 | 1794 |
| Butomaceae | 1 | 3 |
| Cymodoceaceae | 6 | 41 |
| Hydrocharitaceae | 15 | 220 |
| Juncaginaceae | 3 | 28 |
| Maundiaceae | 1 | 1 |
| Posidoniaceae | 1 | 11 |
| Potamogetonaceae | 7 | 196 |
| Ruppiaceae | 0 | 1 |
| Scheuchzeriaceae | 1 | 2 |
| Tofieldiaceae | 5 | 22 |
| Zosteraceae | 2 | 27 |