Mammillaria fragilis Salm-Dyck, Cact. Hort. Dyck., ed. 1849: 103. 1850
Mammillaria fragilis, Cact. Hort. Dyck., ed. 1849: 103. 1850
is basionym for Chilita fragilis in Cactography 2. 1926
is basionym for Neomammillaria fragilis, Cactaceae 4: 133–134, f. 145. 1923