Echinocactus megalothelon Sencke Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Cactaceae genus Gymnocalycium species Gymnocalycium denudatum Name Homonyms Echinocactus megalothelon Sencke ex K.Schum. Echinocactus megalothelon Sencke