Ambrosia psilostachya var. psilostachya Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Asterales family Asteraceae genus Ambrosia species Ambrosia psilostachya Name Homonyms Ambrosia psilostachya var. psilostachya Ambrosia psilostachya subsp. psilostachya