living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Embryobionta Cronquist, Takht. & W.Zimm.
         Division Magnoliophyta Cronquist, Takht. & Zimmerm. (1966) see Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996)
           Class Liliopsida Batsch (1802) see Class Magnoliopsida Brongn. (1843)
             Subclass Commelinidae Takht. (1967) see Order Commelinales Mirb. ex Bercht. & J.Presl (1820)
               Order Hydatellales Cronquist (1980) see Order Nymphaeales Salisb. ex Bercht. & J.Presl (1820)
                 Family Hydatellaceae U.Hamann (1976)
                   1 Genus Hydatella Diels, in Diels & Pritzel (1904)
                   2 Genus Trithuria Hook.f. (1858)