Mammillaria dioica f. verhaertiana (Boed.) Neutel. in Succulenta (Netherlands) 65: 119, 198. 1986
Mammillaria dioica f. verhaertiana in Succulenta (Netherlands) 65: 119, 198. 1986
is new combination for Mammillaria verhaertiana in Monatsschr. Kakteenk. 22: 152. 1912