Chlorobiota Kendrick et Crane
   Pteridobiotina [Britton & A. Br. (1896)]
     Cycadophytanae [Doweld (2001)]
       IX †Progymnospermophyta Bold et al.
       X †Pteridospermatophyta [Meyen]
       XI Cycadophyta [Bessey (1907)]
       Ginkgophyta [Bessey (1907)] [monotypic]
         Gnetophyta [Bessey (1907)] [monotypic]
           Pinophyta [Cronquist, Takht. & Zimmerm. ex Reveal (1996)] [monotypic]
             XV Magnoliophyta Cronq., Takht. et Zimerm. ex Reveal