Mammillaria meyranii Bravo Mammillaria meyranii Bravo in Cact. Succ. J. Gr. Brit. 18: 84. 1956 sec. Hunt 2016=Mammillaria meyranii var. michoacana Buchenau in Cact. Suc. Mex. 14: 75. 1969 syn. sec. Guzmán & al. 2003