Ariocarpus retusus Lectotype: [icon] Scheidw. in Bull. Acad. Roy. Sci. Bruxelles 5: fig. of A. retusus. 1838 Neotype: Mexico, San Luis Potosi, 1 mi N of km marker 18 on road San Luis Potosi-Rio Verde, 4 Jul 1958, E. F. Anderson 1082 (POM: 288947) Mexico, Nuevo León, in collibus petrosis, solo calcareo prope Aramberri, 20 Nov 1985, J. J. Halda JJH 85114.3 (PRC)
