[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Alphaproteobacteria Garrity et al. 2006
         Order Rhizobiales Kuykendall 2006
           Family Rhizobiaceae Conn 1938 (Approved Lists 1980)
             1 Genus Rhizobium Frank 1889 (Approved Lists 1980)
             1.0.1 Genus Agrobacterium Conn 1942 (Approved Lists 1980) see Genus Rhizobium Frank 1889 (Approved Lists 1980)
             1.0.2 Genus Allorhizobium de Lajudie et al. 1998 see Genus Rhizobium Frank 1889 (Approved Lists 1980)
             2 Genus Sinorhizobium Chen et al. 1988
             3 Genus Carbophilus Meyer et al. 1994
             4 Genus Ensifer Casida 1982
             5 Genus Kaistia Im et al. 2005