[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Alphaproteobacteria Garrity et al. 2006
         Order Rhizobiales Kuykendall 2006 see Order Hyphomicrobiales Douglas 1957 (Approved Lists 1980)
           Family Rhizobiaceae Conn 1938 (Approved Lists 1980)
             1 Genus Rhizobium Frank 1889 (Approved Lists 1980) nom. cons.
             1.0.1 Genus Agrobacterium Conn 1942 (Approved Lists 1980) nom. cons.
             1.0.2 Genus Allorhizobium de Lajudie et al. 1998
             2 Genus Sinorhizobium Chen et al. 1988 see Genus Ensifer Casida 1982
             3 Genus Carbophilus Meyer et al. 1994
             4 Genus Ensifer Casida 1982
             5 Genus Kaistia Im et al. 2005