plantenrijk Haeckel (1866) - plants
   [Division] Protophyta Sachs 1874 - primitive plants
     Class Schizomycetes Nägeli 1857 (Approved Lists 1980) - bacteria and related forms
       Order Eubacteriales Buchanan 1917 (Approved Lists 1980) see Order Clostridiales Prévot 1953 (Approved Lists 1980)
         Family Rhizobiaceae Conn 1938 (Approved Lists 1980)
           Genus Agrobacterium Conn 1942 (Approved Lists 1980) see Genus Rhizobium Frank 1889 (Approved Lists 1980)