Sclerocactus whipplei subsp. heilii United States of America, New Mexico, N San Juan County, 7 Aug 1971, Heil 3903A & 3903B (UNM: 49871 & 49872) Isotype: United States of America, New Mexico, N San Juan County, 7 Aug 1971, Heil 3903A & 3903B (UNM: 49874)