Sclerocactus Britton & Rose, Cactaceae. Jahrbucher der Deutschen Kakteen-Gesellschaft (Berlin) 3: 212, 1922

Sclerocactus blainei S.L. Welsh & K.H. Thorne, Great Basin Naturalist 45 (3): 553-555, f. 1, 1985

Sclerocactus brevihamatus (Engelmann) D.R. Hunt, Bradleya; Yearbook of the British Cactus and Succulent Society 9: 91, 1991

Sclerocactus brevihamatus ssp. brevihamatus  

Sclerocactus brevihamatus ssp. tobuschii (W.T. Marshall) N.P. Taylor, Piante Grasse 15 (1): 8, 1995

Sclerocactus brevispinus K.D. Heil & J.M. Porter, Haseltonia 2: 26, 1994

Sclerocactus busekii  

Sclerocactus cloverae K.D. Heil & J.M. Porter, Haseltonia 2: 31, 1994

Sclerocactus cloverae ssp. brackii K.D. Heil & J.M. Porter, Haseltonia 2: 33, 1994

Sclerocactus cloveriae K. D. Heil & J. M. Porter, Haseltonia 2: 31-32., 1994

Sclerocactus cloveriae ssp. brackii K. D. Heil & J. M. Porter, Haseltonia 2: 33., 1994

Sclerocactus contortus K.D. Heil, Cactus and Succulent Journal [U. S. ] 51: 25, 1979

Sclerocactus cowperi HK 1002, Koehres cat. 1989 

Sclerocactus erectocentrus (J.M. Coulter) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 5: 94, 1987

Sclerocactus franklinii J. W. Evans, Cact. & Succ. Journ., Amer. 11. 74., 1939

Sclerocactus glaucus (K. Schumann) L.D. Benson, Cactus and Succulent Journal [U. S. ] 38 (2-3): 53-54, 1966

Sclerocactus glaucus franklinii  

Sclerocactus gradyi 

Sclerocactus havasupaiensis Clover, American Journal of Botany 29: 172, 1942

Sclerocactus havasupaiensis v. roseus Clover, Amer. J. Bot. 29: 173, fig. 3, 4., 1942

Sclerocactus heilii  

Sclerocactus heilii v. gradyi  

Sclerocactus heilii v. multiflorus 

Sclerocactus heilii v. reevesii 

Sclerocactus intermedius Peebles, Leaflets of Western Botany 5 (12): 191-192, 1949

Sclerocactus intertextus (Engelmann) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 5: 94, 1987

Sclerocactus intertextus v. dasyacanthus (Engelmann) N.P. Taylor, Bradleya, 5: 94: 1987

Sclerocactus johnsonii (Engelmann) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 5: 94, 1987

Sclerocactus mariposensis (Hester) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 5: 94, 1987

Sclerocactus mesae-verdae (Boissev. & C. Davidson) L.D. Benson, Cactus and Succulent Journal [U. S. ] 38: 54, 1966

Sclerocactus nevadensis  

Sclerocactus nyensis F. Hochstätter, Succulenta (Netherlands) 71 (6): 253, 1992

Sclerocactus papyracanthus (Engelmann) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 5: 91, 1987

Sclerocactus parviflorus Clover & Jotter, Bulletin of the Torrey Botanical Club 68: 419, 1941

Sclerocactus parviflorus f. macrospermus F. Hochstätter, Cactaceae Rev., cf. Repert. Pl. Succ. (I. O. S.), et in Piante Grasse, 1 (1): 11-12; 49: 24 (1998 publ. 1999); 19 (1): 9 (1999), without latin descr., 1998

Sclerocactus parviflorus f. terrae-canyonae Sclerocactus parviflorus f. variiflorus

F. Hochstätter, Cactaceae Rev., cf. Repert. Pl. Succ. (I. O. S.), et in Piante Grasse, 1 (1): 8-10; 49: 24 (1998 publ. 1999); 19 (1): 8 (1999), without latin descr., 1998

Sclerocactus parviflorus ssp. havasupaiensis (Clover) F. Hochstaetter, Succulenta (Netherlands) 74 (1): 38, 1995

Sclerocactus parviflorus ssp. intermedius (Peebles) K.D. Heil & J.M. Porter, Haseltonia 2: 27, 1994

Sclerocactus parviflorus ssp. parviflorus  

Sclerocactus parviflorus ssp. terrae-canyonae (K.D. Heil) K.D. Heil & J.M. Porter, Haseltonia 2: 27, 1994

Sclerocactus parviflorus v. blessingiae W. Earle, Saguaroland Bulletin 34: 29, 1980

Sclerocactus parviflorus v. contortus 

Sclerocactus parviflorus v. gradyi 

Sclerocactus parviflorus v. heilii 

Sclerocactus parviflorus v. intermedius

Sclerocactus parviflorus v. reevesii 

Sclerocactus polyancistrus (Engelmann & J. M. Bigelow) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 213-215, pl. 23, f. 3; f. 224, 1922

Sclerocactus pubispinus (Engelmann) L.D. Benson, Cactus and Succulent Journal [U. S. ] 38: 103, 1966

Sclerocactus pubispinus ssp. pubispinus 

Sclerocactus pubispinus v. sileri L.D. Benson, The cacti of Arizona 23, 179, 1969

Sclerocactus pubispinus v. spinosior (Engelm.) S.L. Welsh, Great Basin Nat., 44 (1): 67: 1984

Sclerocactus pygmaeus 

Sclerocactus scheeri (Salm-Dyck) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 5: 94, 1987

Sclerocactus schlesseri K. D. Heil & S. L. Welsh, Great Basin Naturalist 46: 677-678, 1986

Sclerocactus sect. Coloradoa (Boissev. & C. Davidson) A.B. Doweld, Sukkulent (Moscow), 1999 (2): 27: 1999

Sclerocactus sect. Mesae-verdae F. Hochstätter, Piante Grasse, 19 (1): 18., 1999

Sclerocactus sect. Parviflori F. Hochstätter, Piante Grasse, 19 (1): 17., 1999

Sclerocactus sileri (L.D. Benson) K.D. Heil & J.M. Porter, Haseltonia 2: 39, 1994

Sclerocactus spinosior (Engelmann) D. Woodruff & L.D. Benson, Cactus and Succulent Journal [U. S. ] 48 (3): 131, 1976

Sclerocactus spinosior ssp. blainei (S.L. Welsh & K.H. Thorne) F. Hochstätter, Succulenta, 74 (1): 43: 1995

Sclerocactus spinosior v. blainei

Sclerocactus spinosior v. schlesseri (K.D. Heil & S.L. Welsh) F. Hochstätter, Succulenta, 71 (6): 259, without basionym ref.: 1992

Sclerocactus terrae-canyonae K.D. Heil, Cactus and Succulent Journal [U. S. ] 51: 26, 1979

Sclerocactus uncinatus (Galeotti) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 5: 94, 1987

Sclerocactus uncinatus ssp. crassihamatus (F.A.C. Weber) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 5: 94, 1987

Sclerocactus uncinatus ssp. uncinatus 

Sclerocactus uncinatus ssp. wrightii (Engelmann) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 5: 94, 1987

Sclerocactus uncinatus v. crassihamatus

Sclerocactus uncinatus v. wrightii

Sclerocactus unguispinus (Engelmann) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 5: 94, 1987

Sclerocactus unguispinus v. durangensis (Runge) N.P. Taylor, Bradleya, 5: 94: 1987

Sclerocactus warnockii (L.D. Benson) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 5: 94, 1987

Sclerocactus wetlandicus F. Hochstätter, Succulenta, 68 (6): 123, 125, 1989

Sclerocactus wetlandicus ssp. ilseae

(F. Hochstätter) F. Hochstätter, Genera Pediocactus, Navajoa, Toumeya Revised: 141, without exact basionym page: 1995

Sclerocactus wetlandicus v. ilseae

Sclerocactus whipplei (Engelmann & J. M. Bigelow) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 213, pl. 16, f. 2, 1922

Sclerocactus whipplei ssp. busekii F. Hochstätter, Succulenta, 74 (3): 136, 1995

Sclerocactus whipplei subvar. aztecia 

Sclerocactus whipplei v. glaucus (K. Schumann) S.L. Welsh, Great Basin Nat., 44 (1): 68: 1984

Sclerocactus whipplei v. heilii E.F. Castetter, P. Pierce & K.H. Schwerin, Cactus and Succulent Journal [U. S. ] 48: 79, 1976

Sclerocactus whipplei v. intermedius (Peebles) L. D. Benson, Cact. Succ. J. (Los Angeles) 38: 102., 1966

Sclerocactus whipplei v. pygmaeus Peebles, Leaflets of Western Botany 5 (12): 192, 1949

Sclerocactus whipplei v. reevesii E.F. Castetter, P. Pierce & K.H. Schwerin, Cactus and Succulent Journal [U. S. ] 48: 80, 1976

Sclerocactus whipplei v. roseus (Clover) L. D. Benson, Cact. Succ. J. (Los Angeles) 38: 101., 1966

Sclerocactus whipplei v. spinosior Engelmann, Trans. Acad. Sci. St. Louis 2: 199., 1863

Sclerocactus whipplei v. tutemdius 

Sclerocactus wrightiae L.D. Benson, Cactus and Succulent Journal [U. S. ] 38: 55, 1966