Oxygonum dregeanum var. dregeanum Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Polygonaceae genus Oxygonum species Oxygonum dregeanum Name Homonyms Oxygonum dregeanum subsp. dregeanum Oxygonum dregeanum var. dregeanum