Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Pteridobiotina Britton & A. Br. (1896)
     Superdivision Cycadophytanae Doweld (2001) see Superphylum Cycadophytanae Doweld (2001)
       Division †Pteridospermatophyta Meyen
         Class †Moresnetiopsida Doweld (2001)
           Order †Calamopityales Němejc (1963) [monotypic]
             Family †Calamopityaceae D.H.Scott (1909)
               1 Genus †Bostonia W.E. Stein & C.B.Beck (1978)
               2 Genus †Buteoxylon P.D.W.Barnard & A.G. Long (1973)
               3 Genus †Galtiera C.B.Beck & W.E. Stein (1987)
               4 Genus †Kalymma Unger (1856)
               5 Genus †Stenomyelon Kidst. (1909)