This is the second instalment of an annotated index of Mammillaria names, continued from Bradleya 1: 105–128 (1983). The series-name Macrothelae is replaced by Mammillaria in accordance with Art. 22.1 of the 1983 (Sydney) edition of the International Code of Botanical Nomenclature. The species M. heidiae is transferred to subg. Mammillaria ser. Ancistracanthae.