Thelocactus bicolor var. bolaensis (Runge) F. M. Knuth
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose)
Thelocactus bicolor var. bolansis (K. Schum.) F. M. Knuth
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose)
Thelocactus bicolor var. pottsii (Salm-Dyck) Backeb.
Thelocactus bicolor var. schwarzii (Backeb.) E. F. Anderson
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose)