Notocactus mueller-melchersii var. winkleri (Vliet) N.Gerloff & Neduchal in Internoto 25: 112. 2004
Notocactus mueller-melchersii var. winkleri in Internoto 25: 112. 2004
is new combination for Notocactus winkleri in Succulenta (Netherlands) 54: 136. 1975