Discocactus heptacanthus var. semicampaniflorus (Buining & Brederoo) P.J.Braun & Esteves in Kakteen And. Sukk. 44: 103.
Discocactus heptacanthus var. semicampaniflorus in Kakteen And. Sukk. 44: 103. 1993
is new combination for Discocactus semicampaniflorus in Cact. Succ. J. (Los Angeles) 47: 122. 1975