Ephedra americana subsp. humboldtii Stapf Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Plantae phylum Tracheophyta class Gnetopsida order Ephedrales family Ephedraceae genus Ephedra species Ephedra breana Name Homonyms Ephedra americana var. humboldtii Stapf Ephedra americana subsp. humboldtii Stapf