Melocactus zehntneri (Britton & Rose) Leutzelb. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Cactaceae genus Melocactus species Melocactus zehntneri Name Homonyms Melocactus zehntneri (Britton & Rose) Backeb. Melocactus zehntneri (Britton & Rose) Leutzelb. Melocactus zehntneri (Britton & Rose) Luetzelb.