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 Cornidae Frohne & U. Jensen ex Reveal (1994) see Subclass Asteridae Takht. (1967)
                   Superorder Cornanae Thorne ex Reveal (1996) see Order Cornales Link (1829)
                     Order Grubbiales Doweld (2001) [monotypic]
                       Family Grubbiaceae Endl. ex Meisn. (1841), nom. cons. - Grubbia family
                         1 Genus Grubbia P.J.Bergius (1767)