Cynanchum flavescens Siebold Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Gentianales family Apocynaceae genus Vincetoxicum species Vincetoxicum japonicum Name Homonyms Cynanchum flavescens Siebold ex Lindl. & Paxton Cynanchum flavescens Siebold