passages.id: split_6_test_1741_passage
passages.type: progene_text
passages.text: In order to define the taxonomic position of this new species and include it in the molecular authentication of Ginseng drugs , the 18S ribosomal RNA gene and matK gene sequences of P. vietnamensis were determined and compared with those of its related taxa , P. japonicus var. major and P. pseudo - ginseng subsp. himalaicus , besides previously reported P. ginseng , P. japonicus and P. quinquefolius .