Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
       Subkingdom Pteridobiotina Britton & A. Br. (1896)
         Superphylum Cycadophytanae Doweld (2001)
           Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
             Subphylum Magnoliophytina Reveal (1996)
               Class Magnoliopsida Brongn. (1843)
                 Subclass Winteridae Doweld (2001)
                   Superorder Trimenianae Doweld (2001) [monotypic]
                     Order Trimeniales Doweld (2000) [monotypic] see Order Austrobaileyales Takht. ex Reveal (1992)
                       Family Trimeniaceae Gibbs (1917), nom. cons.
                         1 Genus Trimenia Seem. (1873)