Helianthus grandiflorus Juss. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Helianthus species Helianthus decapetalus Name Homonyms Helianthus grandiflorus Wood Helianthus grandiflorus Wender. ex Steud. Helianthus grandiflorus Juss. ex Pers. Helianthus grandiflorus Wender. Helianthus grandiflorus Juss.