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 †Pentoxylopsida D.D.Pant (1959) [monotypic] Order †Pentoxylales Pilg. & Melchior (1954) [monotypic] Family †Pentoxylaceae Pilg. & Melchior (1954) [monotypic] 1 Genus †Pentoxylon B.P.Srivast. (1944)