Mammillaria stenocephala Scheidw. ex Labour. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Cactaceae genus Mammillaria species Mammillaria rhodantha Name Homonyms Mammillaria stenocephala Scheidw. ex Labour. Mammillaria stenocephala Scheidw.