Helianthus giganteus var. subtuberosus E.S.Burgess Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Helianthus species Helianthus giganteus Name Homonyms Helianthus giganteus var. subtuberosus Britton Helianthus giganteus var. subtuberosus E.S.Burgess Helianthus giganteus subsp. subtuberosus Britton