Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
   Class Magnoliopsida Brongn. (1843)
     Subclass Caryophyllidae Takht. (1967) see Order Caryophyllales Juss. ex Bercht. & J.Presl (1820)
       Superorder Caryophyllanae Takht. (1967)
         Order Caryophyllales Juss. ex Bercht. & J.Presl (1820)
           Suborder Portulacineae Engl. (1898) see Order Caryophyllales Juss. ex Bercht. & J.Presl (1820)
             Family Cactaceae Juss. (1789), nom. cons. - cactus family
               Subfamily Opuntioideae K. Schumann
                 1 Genus Pereskiopsis N.L. Britton & Rose (1907)
                 2 Genus Quiabentia Britton & Rose
                 3 Genus Tacinga N.L. Britton & Rose (1919)
                 4 Genus Opuntia Mill. (1754)
                 5 Genus Pterocactus K. Schumann (1897)