Ageratum houstonianum f. houstonianum Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Ageratum species Ageratum houstonianum Name Homonyms Ageratum houstonianum f. houstonianum Ageratum houstonianum subsp. houstonianum