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 Rutidae Doweld (2001)
                   Superorder Burseranae Doweld (2001)
                     Order Nitrariales Doweld (2001), nom. inval.
                       Family Peganaceae Takht. ex Doweld (2001), nom. inval. [monotypic] see Family Peganaceae Tiegh. ex Takht. (1987)
                         1 Genus Peganum L. (1753)