Cirsium spinosissimum (Walter) B.L.Rob. & Fernald Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Cirsium species Cirsium horridulum Name Homonyms Cirsium spinosissimum (Walter) B.L.Rob. & Fernald Cirsium spinosissimum (L.) Scop.