Mammillaria barkeri Shurly ex Backeb. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Cactaceae genus Mammillaria species Mammillaria beneckei Name Homonyms Mammillaria barkeri Shurly Mammillaria barkeri Shurly ex Backeb.