Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
   Class Magnoliopsida Brongn. (1843)
     Subclass Lamiidae Takht. ex Reveal (1993) see [unranked] lamiids
       Superorder Loasanae R.Dahlgren ex Reveal (1996) see Order Cornales Link (1829)
         Order Loasales Bessey (1907) see Order Cornales Link (1829)
           Family Loasaceae Juss. (1804), nom. cons. - Loasa family
             Subfamily Gronovioideae (Rchb.) M. Roem.
               1 Genus Petalonyx A.Gray (1855)
               2 Genus Cevallia Lag. (1805)
               3 Genus Gronovia L. (1753)
               4 Genus Fuertesia Urban (1911)