Discocactus placentiformis subsp. pugionacanthus (Buining & Brederoo) P.J.Braun & Esteves in Kakteen And. Sukk. 46: 64.
Discocactus placentiformis subsp. pugionacanthus in Kakteen And. Sukk. 46: 64. 1995
is new combination for Discocactus pugionacanthus, Discocactus: 61. 1976