Botany: herbs; aquatics, marshes.
The order of the Alismatales in the Monocots consists mostly of water plants.
In the Plant theory the Araceae, the Arum family, an early diverging lineage, is split off in this treatment and has been placed in its own order Arales. The Subphases are tentative.
3. Zosteraceae, including Cymodoceaceae, Posidoniaceae, Potamogetonaceae, Ruppiaceae
5. Scheuzeriacea, Aponogetonaceae