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Two Gram-stain-negative strains, RCAM04680 T and RCAM04685, were isolated from root nodules of the relict legume Caragana jubata (Pall.) Poir. originating from the south-western shore of Lake Khuvsgul (Mongolia). The 16S rRNA gene ( rrs ) sequencing data showed that these novel isolates belong to the genus Bosea and are phylogenetically closest to the type strains Bosea lathyri LMG 26379 T , Bosea vaviloviae LMG 28367 T , Bosea massiliensis LMG 26221 T and Bosea lupini LMG 26383 T (the rrs -similarity levels were 98.7-98.8 %). The recA gene of strain RCAM04680 T showed the highest sequence similarity to the type strain B. lupini LMG 26383 T (95.4 %), while its atpD gene was closest to that of B. lathyri LMG 26379 T (94.4 %). The ITS, dnaK and gyrB sequences of this isolate were most similar to the B. vaviloviae LMG 28367 T (86.8 % for ITS, 90.4 % for the other genes). The most abundant fatty acid was C 18 : 1 ω7 c (40.8 %). The whole genomes of strains RCAM04680 T and RCAM04685 were identical (100 % average nucleotide identity). The highest average nucleotide identity value (82.8 %) was found between the genome of strain RCAM04680 T and B. vaviloviae LMG 28367 T . The common nod ABC genes required for legume nodulation were absent in both strains; however, some other symbiotic nol , nod , nif and fix genes were detected. Based on the genetic study, as well as analyses of the whole-cell fatty acid compositions and phenotypic properties, a new species, Boseacaraganae sp. nov. (type strain RCAM04680 T (=LMG 31125 T ), is proposed.