Melocactus inconcinnus Buining & Brederoo in Kakteen And. Sukk. 26: 193. 1975 sec. Taylor & Zappi 2004
- ≡Melocactus bahiensis f. inconcinnus (Buining & Brederoo) N.P.Taylor in Bradleya 9: 30. 1991 syn. sec. Taylor & Zappi 2004
- =Melocactus heimenii P.J.Braun & Gonç.Brito in Kakteen And. Sukk. 70: 310. 2019 syn. sec. Zappi & Taylor 2020