Polygonum rugosum Buch.-Ham. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Polygonaceae genus Fagopyrum species Fagopyrum cymosum Name Homonyms Polygonum rugosum Buch.-Ham. ex Endl. Polygonum rugosum Buch.-Ham.