the root (no rank)
Bacteria (domain)
Proteobacteria (phylum)
Alphaproteobacteria (class)
Rhizobiales (order)
Rhizobiaceae (family)
Rhizobium (genus)
[hide inferior taxa]
Rhizobium capacia (species)
Rhizobium etli (species)
Rhizobium galegae (species)
Rhizobium leguminosarum (species)
Rhizobium radiobacter (species)
Rhizobium sp. (species)
Rhizobium sullae (species)
Rhizobium tropici (species)