Domain Bacteria Woese et al. 1990
   Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
     Class "Alphaproteobacteria" Garrity and Holt 2001 nom. nud. see Class Alphaproteobacteria Garrity et al. 2006
       Order "Rhizobiales" see Order Rhizobiales Kuykendall 2006
         Family "Bradyrhizobiaceae" Garrity et al. 2001 nom. ined. see Family Bradyrhizobiaceae Garrity et al. 2006
           Genus Afipia Brenner et al. 1992
           Genus Agromonas Ohta and Hattori 1985 see Genus Bradyrhizobium Jordan 1982
           Genus Blastobacter Zavarzin 1961 (Approved Lists 1980)
           Genus Bosea Das et al. 1996
           Genus Nitrobacter Winogradsky 1892 (Approved Lists 1980)
           Genus Oligotropha Meyer et al. 1994
           Genus Rhodopseudomonas Czurda and Maresch 1937 (Approved Lists 1980)
           1 Genus Bradyrhizobium Jordan 1982