Family Posidoniaceae Hutchinson 1895
Angiospermae - Alismatales - Posidoniaceae
Alternative spelling: Posidonioideae
Parent taxon: Alismatales according to The Angiosperm Phylogeny Group 2016
See also den Hartog 1970 and Mabberley 2000
Sister taxa: Alismataceae, Aponogetonaceae, Butomaceae, Cymodoceaceae, Hydrocharitaceae, Juncaginaceae, Maundiaceae, Pennipollis, Potamogetonaceae, Ruppiaceae, Scheuchzeriaceae, Thalassocharis, Tofieldiaceae, Zannichelliaceae, Zosteraceae
Ecology: "photoautotroph"
Distribution: