Echinocactus macdowellii Rebut Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Cactaceae genus Thelocactus species Thelocactus macdowellii Name Homonyms Echinocactus macdowellii Rebut Echinocactus macdowellii Rebut ex Quehl Echinocactus macdowellii Orcutt