Carduus horridulus subsp. elliottii Torr. & A.Gray Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Cirsium species Cirsium horridulum Name Homonyms Carduus horridulus subsp. elliottii Torr. & A.Gray