Rheum crassinervium Fisch. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Polygonaceae genus Rheum species Rheum spiciforme Name Homonyms Rheum crassinervium Fisch. ex Lindl. Rheum crassinervium Fisch.