The genus Xanthomonas contains a set of diverse bacterial strains, most of which are known for their pathogenicity on annual crops and fruit trees causing economically important plant diseases. Recently, five Xanthomonas strains were isolated from Agrobacterium -induced crown gall tissues of amaranth ( Amaranthus sp.) and weeping fig ( Ficus benjamina ) plants in Iran. Phenotypic characteristics ( i.e . biochemical tests and pathogenicity features) and whole genome sequence-based core-genome phylogeny followed by average nucleotide identity and digital DNA–DNA hybridization calculations suggested that these gall-associated strains belong to two new species within the genus Xanthomonas . In this study, we provide a formal species description for these new species where Xanthomonas bonasiae sp. nov. is proposed for the strains isolated from weeping fig with FX4 T (=CFBP 8703 T =DSM 112530 T ) as type strain. The name Xanthomonas youngii sp. nov. is proposed for the strains isolated from amaranth with AmX2 T (=CFBP 8902 T =DSM 112529 T ) as type strain.