Helianthus subtuberosus (Britton) Britton Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Helianthus species Helianthus giganteus Name Homonyms Helianthus subtuberosus (Britton) Britton Helianthus subtuberosus (Britton) Bourg. ex A.Gray Helianthus subtuberosus Bourg.