Silphium compositum subsp. compositum Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Silphium species Silphium compositum Name Homonyms Silphium compositum f. compositum Silphium compositum subsp. compositum Silphium compositum var. compositum