Cynanchum nigrum (L.) R.Br. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Gentianales family Apocynaceae genus Vincetoxicum species Vincetoxicum nigrum Name Homonyms Cynanchum nigrum (L.) Pers. Cynanchum nigrum Cav. Cynanchum nigrum (L.) R.Br.