Mammillaria formosa subsp. microthele
Mammillaria formosa subsp. microthele, Mammillaria Postscripts 6: 9. 1997 sec. Hunt 20161
- ≡Mammillaria microthele in Jahrb. Deutsch. Kakteen-Ges.: 135. 1936 syn. sec. Hunt 20161
- ≡Mammillaria formosa var. microthele, Cact. Hort. Dyck., ed. 1849: 87. 1850 syn. sec. ???
- =? Cactus bispinus in Contr. U.S. Natl. Herb. 3(2): 101. 1894 syn. sec. Britton & Rose 19233