[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)
             Genus Rhizobium Frank 1889 (Approved Lists 1980)
               01 Rhizobium leguminosarum (Frank 1879) Frank 1889 (Approved Lists 1980)
               02 Rhizobium daejeonense Quan et al. 2005
               03 Rhizobium etli Segovia et al. 1993
               04 Rhizobium galegae Lindström 1989
               05 Rhizobium gallicum Amarger et al. 1997
               06 Rhizobium giardinii Amarger et al. 1997
               07 Rhizobium hainanense Chen et al. 1997
               08 Rhizobium huautlense Wang et al. 1998
               09 Rhizobium indigoferae Wei et al. 2002
               10 Rhizobium loessense Wei et al. 2003
               11 Rhizobium larrymoorei (Bouzar and Jones 2001) Young 2004
               12 Rhizobium lupini (Schroeter 1886) Eckhardt et al. 1931 (Approved Lists 1980)
               13 Rhizobium mongolense Van Berkum et al. 1998
               14 Rhizobium phaseoli Dangeard 1926 (Approved Lists 1980)
               15 Rhizobium radiobacter (Beijerinck and van Delden 1902) Young et al. 2001
               16 Rhizobium rhizogenes (Riker et al. 1930) Young et al. 2001
               17 Rhizobium rubi (Hildebrand 1940) Young et al. 2001
               18 Rhizobium sullae Squartini et al. 2002
               19 Rhizobium trifolii Dangeard 1926 (Approved Lists 1980)
               20 Rhizobium tropici Martínez-Romero et al. 1991
               21 Rhizobium undicola (de Lajudie et al. 1998) Young et al. 2001
               22 Rhizobium vitis (Ophel and Kerr 1990) Young et al. 2001
               23 Rhizobium yanglingense Tan et al. 2001