mesorhizobium amorphae mesorhizobium amorphae mesorhizobium amorphae is a species of root nodule bacteria first isolated from amorpha fruticosa species in china. it is purported to be native to american soil. its genome has been sequenced. its type strain is accc 19665. mesorhizobium amorphae scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: phyllobacteriaceae genus: mesorhizobium species: m. amorphae binomial name mesorhizobium amorphaewang et al. 1999