Lapathum occidentale Michx. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Polygonaceae genus Rumex species Rumex occidentalis Name Homonyms Lapathum occidentale (S.Watson) Lunell Lapathum occidentale Michx. Lapathum occidentale Michx. ex Lam.