plantenrijk Haeckel (1866) - plants
   [Division] Protophyta Sachs (1874) - primitive plants
     Class Schizomycetes Nägeli 1857 nom. inval. - bacteria and related forms see Class Schizomycetes Nägeli 1857 (Approved Lists 1980) nom. illeg., nom. rej.
       Order Eubacteriales Buchanan 1917 nom. inval. see Order Eubacteriales Buchanan 1917 (Approved Lists 1980)
         Family Rhizobiaceae Conn 1938 nom. inval.
           1 Genus Agrobacterium Conn 1942 nom. inval.
           2 Genus Rhizobium Frank 1889 nom. inval., nom. cons.