phyllobacterium leguminum phyllobacterium leguminum phyllobacterium leguminum is a gram-negative bacteria from the genus of phyllobacterium which was isolated from root nodules from the plants argyrolobium uniflorum and astragalus algerianus. phyllobacterium leguminum scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: phyllobacteriaceae genus: phyllobacterium species: p. leguminum binomial name phyllobacterium leguminummantelin et al. 2006 type strain cfbp 6745, lmg 22833, ors 1419