Ferocactus acanthodes (Lemaire) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 129-131, pl. 15, f. 1, 2; f. 134-137, 1922
Ferocactus acanthodes v. acanthodesFerocactus acanthodes v. eastwoodiae L.D. Benson, The cacti of Arizona 23, 166-167, 169, 1969
Ferocactus acanthodes v. hertrichiiFerocactus acanthodes v. johnstonianus (Britton & Rose) G. Unger, Die grossen Kugelkakteen Nordamerikas 132, 1992
Ferocactus acanthodes v. lecontei (Engelmann) G.E. Lindsay, Cact. Succ. J. (Los Angeles) 27: 169., 1955Ferocactus acanthodes v. rostii (Britton & Rose) Marshall in Marshall & T. M. Bock, Cactaceae (Berlin) 148., 1941
Ferocactus acanthodes v. tortulispinusFerocactus acanthodes v. tortulospinus (H.E. Gates) G.E. Lindsay, Cactus & Succ. Jour. 27: 168, 1955
Ferocactus alamosanus (Britton & Rose) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 137, f. 145, 1922Ferocactus alamosanus ssp. alamosanus
Ferocactus alamosanus ssp. reppenhagenii (G. Unger) N.P. Taylor, Cactaceae Consensus Initiatives 6: 15, 1998Ferocactus alamosanus v. platygonus G. E. Lindsay, CasJ 14; 139-134, 1942
Ferocactus arizonicus Orcutt, Cactography, 6, 1926Ferocactus bicolor (Galeotti ex Pfeiffer) N.P. Taylor, Cactus and Succulent Journal of Great Britain 41: 30, 1979
Ferocactus bicolor v. bolaensis (Runge) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (2): 30, 1979Ferocactus bicolor v. flavidispinus (Backeberg) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (2): 30, 1979
Ferocactus bicolor v. schwarzii (Backeberg) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (2): 30, 1979Ferocactus californicus (Monville) Borg, Cacti, 235, 1937
Ferocactus chrysacanthus (Orcutt) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 127, 1922Ferocactus chrysacanthus f. rubrispinus (L.M. Ford ex Orcutt) G. Unger, Die grossen Kugelkakteen Nordamerikas 210, 1992
Ferocactus chrysacanthus ssp. chrysacanthusFerocactus chrysacanthus ssp. grandiflorus (G.E. Lindsay) N.P. Taylor, Cactaceae Consensus Initiatives 6: 15, 1998
Ferocactus coloratus H. E. Gates, Cact. & Succ. Journ. Amer. 4. 344., 1933Ferocactus coptonogonus (Lemaire) N.P. Taylor, Cact. Succ. J. Gr. Brit., 42 (4): 108, 1980
Ferocactus corniferusFerocactus corniger De Candolle
Ferocactus coulteri v. rufispinus Y. Ito, The Cactaceae: 499, without type, 1981Ferocactus covillei Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 132-133, f. 138, 139, 1922
Ferocactus crassihamatus (F.A.C. Weber) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 144, f. 151, 1922Ferocactus crispatus (DC.) N.P. Taylor, Cact. Succ. J. Gr. Brit., 42 (4): 108, 1980
Ferocactus cylindraceus (Engelmann) Orcutt, Cactography 5, 1926Ferocactus cylindraceus ssp. cylindraceus
Ferocactus cylindraceus ssp. lecontei (Engelmann) N.P. Taylor, Cactaceae Consensus Initiatives, 6: 16: 1998Ferocactus cylindraceus ssp. tortulispinus (H.E. Gates) N.P. Taylor, Cactaceae Consensus Initiatives, 6: 16: 1998
Ferocactus cylindraceus v. chrysacanthus (Schelle) Y. Ito, The Cactaceae: 490, specific name not validly publ.: 1981Ferocactus cylindraceus v. eastwoodiae (L.D. Benson) N.P. Taylor, Bradleya; Yearbook of the British Cactus and Succulent Society 2: 33, 1984
Ferocactus cylindraceus v. greenwoodiae (Glass) N.P. Taylor, Bradleya 2: 27., 1984Ferocactus cylindraceus v. tortulospinus (Gates) H. Bravo Hollis, Cact. Suc. Mex., 25 (3): 65: 1980
Ferocactus diguetii (F.A.C. Weber) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 131-132, pl. 11, f. 2; pl. 12, f. 3, 1922Ferocactus diguetii v. carmenensis G. E. Lindsay, Cact. Succ. J. (Los Angeles) 27: 167, fig. 156., 1955
Ferocactus diguetii v. diguetiiFerocactus eastwoodiae (L.D. Benson) L.D. Benson, Cacti U. S. & Canada 969, 1982
Ferocactus echidne (DC.) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 135, f. 144, 1922Ferocactus echidne v. aureispina
Ferocactus echidne v. victoriensis (Rose) G.E. Lindsay, Cactus and Succulent Journal [U. S. ] 27: 168, 1955 Ferocactus emoryi (Engelmann) Orcutt, Cactac. Handb. Kak1eenk. 5. 2717, 1961Ferocactus emoryi ssp. emoryi
Ferocactus emoryi ssp. rectispinus (Engelmann) N.P. Taylor, Cactaceae Consensus Initiatives, 6: 16: 1998Ferocactus falconeri Orcutt, Cactography, 6, 1926
Ferocactus flavovirens (Scheidweiler) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 138, 13, f. 1, 1922Ferocactus fordii (Orcutt) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 126-127, f. 132, 1922
Ferocactus fordii v. fordiiFerocactus fordii v. grandiflorus G. E. Lindsay, Cact. Succ. J. (Los Angeles) 27: 164, fig. 154., 1955
Ferocactus gatesii G. E. Lindsay, Cact. & Succ. Journ. Amer. 27. 151., 1955Ferocactus gen. Bisnaga Orcutt
Ferocactus glaucescens (DC.) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 137, 1922Ferocactus glaucescens v. nudum
Ferocactus glaucus (K.Schum.) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979Ferocactus gracilis H. E. Gates, Cact. & Succ. Journ. Amer. 4. 323., 1933
Ferocactus gracilis ssp. coloratus (H.E. Gates) N.P. Taylor, Cactaceae Consensus Initiatives 6: 16, 1998Ferocactus gracilis ssp. gatesii (G.E. Lindsay) N.P. Taylor, Cactaceae Consensus Initiatives, 6: 16: 1998
Ferocactus gracilis ssp. gracilisFerocactus grandiflorus hyb. (G.E. Lindsay) G. Unger, Die grossen Kugelkakteen Nordamerikas 242, 1992
Ferocactus guirocobensis Schwarz ex Backeberg, Die Cactaceae, V; 2743, 1961Ferocactus haematacanthus (Monville) H. Bravo Hollis & F. M. Knuth, Kaktus-ABC, 352, 1935
Ferocactus hamatacanthus (Muehlenpf.) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 144-146, pl. 16, f. 1; f. 152, 1922Ferocactus hamatacanthus ssp. hamatacanthus
Ferocactus hamatacanthus ssp. sinuatus (A. Dietrich) N.P. Taylor, Cactaceae Consensus Initiatives, 5: 13: 1969Ferocactus hamatacanthus v. crassispinus (Engelm.) L. Benson, Cact. Succ. J. (U. S. A.), 46 (2): 80, 1974
Ferocactus hastifer (Werdermann & Boedeker) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979Ferocactus herrerae Ortega, Mex. For. 5. 53; Ortega in Bol. Pro-Cult. Reg. S. C. L. Nos. 14, 15 (Fam. Cact. [25]) (1930). 1927
Ferocactus hertrichii WeingFerocactus heterochromus (A. Weber) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979
Ferocactus histrix (DC) G. Lindsay, Cact. & Succ. Journ. Amer. 27. 171, 1828Ferocactus horridus Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 128, 1922
Ferocactus johnsonii (Parry) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 141, f. 149, 1922Ferocactus johnstonianus Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 4: 287, 1923
Ferocactus latispinus (Haworth) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 143-144, pl. 16, f. 3, 1922Ferocactus latispinus ssp. spiralis (Karwinski ex Pfeiffer) N.P. Taylor, Cactaceae Consensus Initiatives, 5: 13: 1998
Ferocactus latispinus v. flavispinus (Haage) Backeberg & F. M. Knuth, Kaktus-ABC 352., 1935Ferocactus latispinus v. greenwoodii (C. Glass) N.P. Taylor, Bradleya, 2: 27: 1984
Ferocactus latispinus v. latispinus (C. F. Forst.) Backeberg & F. M. Knuth, Kaktus-ABC 352., 1935Ferocactus latispinus v. recurvus (Mill.) Lodé, Cact. Aventures, cf. Repert. Pl. Succ. (I. O. S.), 27: 29, without basionym ref; 46: 10 (1995 publ. 1996): 1995
Ferocactus lecontei (Engelmann) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 129, 1922Ferocactus leucacanthus (Zuccarini) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979
Ferocactus lindsayi H. Bravo Hollis, Cact. & Suc. Mexic. 11. 9., 1966Ferocactus macrodiscus (Mart.) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 139-140, f. 147, 1922
Ferocactus macrodiscus ssp. macrodiscusFerocactus macrodiscus ssp. septentrionalis (Meyran) N.P. Taylor, Cactaceae Consensus Initiatives, 5: 13: 1998
Ferocactus macrodiscus v. decolor (Monville) Y. Ito, The Cactaceae: 497, without basionym ref.: 1981Ferocactus macrodiscus v. multiflorus (Mey) Berg
Ferocactus macrodiscus v. spiralis (Karwinski ex Pfeiffer) N.P. TaylorFerocactus mathssonii (Berge ex K.Schum.) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 91, 1979
Ferocactus melocactiformis (De Candolle) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 138-139, f. 146, 1922Ferocactus mesae-verdae (Boissev. & C.Davidson) N.P.Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979
Ferocactus neohaematacanthus Y. Ito, The Cactaceae: 499, nom. nov., without repl. syn. ref.: 1981Ferocactus nobilis (L.) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 141-143, f. 150, 1922
Ferocactus orcuttii (Engelmann ex Orcutt) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 134, 1922Ferocactus parviflorus (Clover & Jotter) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979
Ferocactus peninsulae (F.A.C. Weber) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 133, f. 140, 1922Ferocactus peninsulae v. coloratus (H.E. Gates) G. Unger, Die grossen Kugelkakteen Nordamerikas 202, 2992
Ferocactus peninsulae v. gracilis (H.E. Gates) G. Unger, Die grossen Kugelkakteen Nordamerikas 193, 1992Ferocactus peninsulae v. peninsulae
Ferocactus peninsulae v. santa-maria (Britton & Rose) N.P. Taylor, Bradleya, 2: 30: 1984Ferocactus peninsulae v. townsendianus (Britton & Rose) N.P. Taylor, Bradleya, 2: 28: 1984
Ferocactus peninsulae v. viscainensis (H.E. Gates) G.E. Lindsay, Cactus & Succ. Jour. 27: 169, 1955Ferocactus pfeiffieri (Zuccarini) Britton & Rose, Cactac. Handb. Kak1eenk. 5. 2742, in obs., 1823
Ferocactus phoeniceus Orcutt, Cactography, 6, 1926Ferocactus phyllacanthus (Dietrich & Otto) N.P. Taylor, Cact. Succ. J. Gr. Brit., 42 (4): 108, 1980
Ferocactus piliferus (Lemaire ex Ehrenberg) G. Unger, Kakteen und Andere Sukkulenten 37 (2): 45, 1986Ferocactus piliferus f. flavispinus (hort. ex Schelle) G. Unger, Kakteen und Andere Sukkulenten 37 (2): 45, 1986
Ferocactus piliferus v. stainesii (Salm-Dyck) G. Unger, Kakteen und Andere Sukkulenten 37 (2): 45, 1986Ferocactus pilosus (Galeotti ex Salm-Dyck) Werdermann, Fedde, Repert. Sonder-Beih. C. t. 72, 1933
Ferocactus platygonus (Lindsay) Lindsay ex Backeberg, Die Cactaceae, V; 2741, 1961Ferocactus polyancistrus (Engelmann & J. M. Bigelow) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979
Ferocactus pottsii (Salm-Dyck) Backeberg, Cactac. Handb. Kak1eenk. 5. 2738, 1961Ferocactus pottsii v. alamosanus (Britton & Rose) G. Unger, Kakt. And. Sukk., 22 (10): 187, 1971
Ferocactus pringlei (J.M. Coulter) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 125-126, pl. 11, f. 1; f. 129, 130, 131, 1922Ferocactus pubispinus (Engelmann) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979
Ferocactus rafaelensis (J.A. Purpus) Borg, Cacti, 236, 1937Ferocactus rectispinus (Engelmann) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 134, pl. 14, 2; f. 142, 1922
Ferocactus recurvus (Mill.) Borg, Die grossen Kugelkakteen Nordamerikas: 299: 1992Ferocactus recurvus f. flavispinus (Haage ex C.F. Foerst.) G. Unger, Die grossen Kugelkakteen Nordamerikas 316, 1992
Ferocactus recurvus f. spiralis (Karwinski ex Pfeiffer) G. Unger, Die grossen Kugelkakteen Nordamerikas 294, 1992Ferocactus recurvus v. greenwoodii (C. Glass) G. Unger, Die grossen Kugelkakteen Nordamerikas 229, 1992
Ferocactus recurvus v. latispinus (Haworth) G. Unger, Die grossen Kugelkakteen Nordamerikas 302, 1992Ferocactus reppenhagenii G. Unger, Kakt. And. Sukk., 25 (3): 50., 1974
Ferocactus rhodanthus SchwarzFerocactus robustus (Link & Otto) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 1135-136, f. 141, 143, 1922
Ferocactus rostii Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 146-147, f. 153b, 1922Ferocactus santa-maria Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 131, 1922
Ferocactus scheeri (Salm-Dyck) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979Ferocactus schwarzii G. E. Lindsay, Cact. & Succ. Journ. Amer. 27. 70., 1955
Ferocactus sect. Bisnaga (Orcutt) N.P. Taylor & J.Y. Clark, Bradleya; Yearbook of the British Cactus and Succulent Society 1: 6, 1983Ferocactus sect. Ferocactus
Ferocactus sect. Glaucescenti G. Unger, Die grossen Kugelkakteen Nordamerikas 89, 1992Ferocactus sect. Pottsia G. Unger, Die grossen Kugelkakteen Nordamerikas 88, 1992
Ferocactus sect. Sclerocactus (B. & R.) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979Ferocactus setispinus (Engelmann) L.D. Benson, Cactus and Succulent Journal [U. S. ] 41: 128, 1969
Ferocactus sinuatusFerocactus sinuatus v. papyracanthus
Ferocactus spinosior (Engelmann) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979Ferocactus stainesii (Hooker) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 124-125, f. 128, 1922
Ferocactus stainesii v. haematacanthus (Salm-Dyck) Backeberg, Cactaceae (Backeberg) 5: 2700., 1961Ferocactus stainesii v. pilosus (Gal) Backeberg, Cactaceae (Backeberg) 5: 2702., 1961
Ferocactus stainesii v. pringlei (Coulter) Backeberg, Cactaceae (Backeberg) 5: 2701., 1961Ferocactus subg. Ancistrocactus (K.Schum.) N.P.Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979
Ferocactus subg. Bisnaga (Orcutt) G. Unger, Die grossen Kugelkakteen Nordamerikas 88, 1992Ferocactus subg. Ferocactus
Ferocactus subg. Hamatacanthus H. Bravo Hollis, Cact. Suc. Mex., 21 (3): 66., 1976Ferocactus subg. Stenocactus (K. Schumann) N.P. Taylor, Cact. Succ. J. Gr. Brit., 42 (4): 108, 1980
Ferocactus tiburonensis (Lindsay) Backeberg, Cactac. Handb. Kak1eenk. 5. 2719, 1961Ferocactus tobuschii (W.T. Marshall) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979
Ferocactus tortulospinus H. E. Gates, Cact. & Succ. Journ. Amer. 4. 343., 1933Ferocactus townsendianus Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 127, f. 133; pl. 12, f. 1, 1922
Ferocactus townsendianus v. santa-maria (Britton & Rose) G.E. Lindsay, Cactus & Succ. Jour. 27: 170, 1955Ferocactus townsendianus v. townsendianus
Ferocactus uncinatus (Galeotti) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 146, f. 153, 153a, 1922Ferocactus uncinatus v. wrightii (Engelmann) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (2): 31, 1979
Ferocactus vaupelianus (Werdermann) N.P. Taylor, Cact. Succ. J. Gr. Brit., 42 (4): 108, 1980Ferocactus victoriensis (Rose) Backeberg, Die Cactaceae 5: 1961
Ferocactus viridescens (Torr. & A. Gray) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 140-141, pl. 14, f. 1; f. 148, 1922Ferocactus viridescens v. littoralis G. E. Lindsay, Cact. Succ. J. (Los Angeles) 36: 8, figs., 1964
Ferocactus viridescens v. orcuttii (Engelmann ex Orcutt) G. Unger, Die grossen Kugelkakteen Nordamerikas 105, 1992Ferocactus viscainensis H. E. Gates, Cact. & Succ. Journ. Amer. 4. 324., 1933
Ferocactus whipplei (Engelmann & J. M. Bigelow) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979Ferocactus wislizeni (Engelmann) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 127-128, pl. 12, f. 2; f. 131a, 1922
Ferocactus wislizeni v. albispinus (Toumey) Y. Ito, Cacti (Borg), 105. 1952, 1952Ferocactus wislizeni v. cristata
Ferocactus wislizeni v. herrerae (J. G. Ortega) N.P. Taylor, Bradleya, 2: 34: 1984Ferocactus wislizeni v. phoeniceus (R. E. Kunze) Y. Ito, Cacti (Borg), 105. 1952, 1952
Ferocactus wislizeni v. tiburonensis G. E. Lindsay, Cact. Succ. J. (Los Angeles) 27: 166, fig. 155., 1955Ferocactus wislizeni v. wislizeni
Ferocactus wislizenii v. flalconeri (Orcutt) Y. Ito, The Cactaceae: 495, without basionym ref.: 1981Ferocactus wislizenii v. rosea Y. Ito, The Cactaceae: 495, without type, 1981
Ferocactus wrightiae (L. Benson) N.P. Taylor, Cact. Succ. J. Gr. Brit., 41 (4): 90, 1979
