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Sinorhizobium americanum is an aerobic gram-negative bacterium that nodulates and fixes nitrogen with Acacia spp., Leucaena leucocephala and Phaseolus vulgaris.Sinorhizobium americanum belongs to the genus Sinorhizobium/Ensifer (Bacteria, Proteobacteria, Alphaproteobacteria, Rhizobiales, Rhizobiaceae). Ensifer is the earlier heterotypic synonym of Sinorhizobium (it was named first) and thus takes priority. This means that all Sinorhizobium spp. must be renamed as Ensiferspp. according to the Bacteriological code. However, this bacterium is still not yet formally renamed as Ensifer and technically the correct name is still Sinorhizobium americanum. The type strain of this species is strain CFNEI 156T. The species S. americanum was described as a natural symbiont of Acacia spp. in Mexico and P. vulgaris in Tunisia. The symbiotic genes harbored by this species are specific of symbiovar mediterranense which is also found with Ensifer meliloti and Ensifer fredii.