Thelocactus bicolor var. pottsii Britton & Rose Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Tracheophyta class Magnoliopsida order Caryophyllales family Cactaceae genus Thelocactus species Thelocactus bicolor Name Homonyms Thelocactus bicolor var. pottsii (Salm-Dyck) Backeb. Thelocactus bicolor var. pottsii Britton & Rose