Melocactus praerupticola Holotype: Dominican Republic, Cordillera Central, Prov. La Vega, 2 km SW of Constanza, on steep rocky cliffs of Rio Pantuflas, ca. 800 m downstream from the pumping station, 13 May 1991, Areces-Mallea 5801 (JBSD: 0000129, isotype: NY barcode 00380567)