Xanthium spinosum f. precosius Bitter Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Xanthium species Xanthium spinosum Name Homonyms Xanthium spinosum f. precosius Bitter ex Widder Xanthium spinosum f. precosius Bitter