Echinocactus lewisii (Henn.) K.Schum. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Cactaceae genus Lophophora species Lophophora williamsii Name Homonyms Echinocactus lewisii (Henn.) K.Schum.