De orde Alismatales R.Br. ex Bercht. & J.Presl kent 14 families.
| Alismataceae Vent. | Hydrocharitaceae Juss. | Ruppiaceae Horan. |
| Aponogetonaceae Planch. | Juncaginaceae Rich. | Scheuchzeriaceae F.Rudolphi |
| Araceae Juss. | Maundiaceae Nakai | Tofieldiaceae Takht. |
| Butomaceae L. | Posidoniaceae Hutch. | Zosteraceae Dumort. |
| Cymodoceaceae Vines | Potamogetonaceae Bercht. & J.Presl |
