Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Superphylum Cycadophytanae Doweld (2001)
           Subphylum Magnoliophytinaᵀ Reveal (1996)
             Subfamily Wolffioideae
               3 Genus Pseudowolffia
               4 Genus Wolffiopsis