Asclepias brachystephana Engelm. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Gentianales family Apocynaceae genus Asclepias species Asclepias brachystephana Name Homonyms Asclepias brachystephana Engelm. ex Torr. Asclepias brachystephana Engelm.