| Thelocactus (K.Schum.) Britton & Rose (Genus) |
| | | | | | | | B | | details |
| Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose (Species) |
| | | | I | | | | B | sB | details |
| Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose var. bicolor (Galeotti ex Pfeiff.) Britton & Rose (Variety) |
| | | | | | | | B | | details |
| Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose var. bolaensis (Ruenge) A.Berger (Variety) |
| | | | | sI | | | | sB | details |
| Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose var. flavidispinus Backeb. (Variety) |
| | | | | | | | | | details |
| Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose var. pottsii (Salm-Dyck) Backeb. (Variety) |
| | | | | sI | | | | sB | details |
| Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose var. tricolor (K.Schum.) F.M.Knuth (Variety) |
| | | | | sI | | | B | sB | details |
| Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose ssp. bicolor (Subspecies) |
| | | | | sI | | | | sB | details |
| Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose ssp. flavidispinus (Backeb.) N.P.Taylor (Subspecies) |
| | | | | | | | | sB | details |
| Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose ssp. schwarzii (Backeb.) N.P.Taylor (Subspecies) |
| | | | | | | | | sB | details |