Echinocactus pringlei J.M.Coult., 1896 species synonym

Echinocactus stainesii Hook. species synonym

Echinocactus robustus Otto ex Pfeiff. species synonym

Echinocactus piliferus Lem. ex Ehrenb., 1848 species synonym

Echinocactus trollietii Rebut species synonym

Ferocactus haematacanthus (Muehlenpf.) Britton & Rose species accepted

Echinocactus peninsulae F.A.C.Weber species synonym

Echinofossulocactus cornigerus var. elatior Lawr. variety synonym

Echinocactus diguetii A.A.Weber species synonym

Echinocactus viridescens Nutt. species synonym

Echinofossulocactus cornigerus var. angustispinus Lawr. variety synonym

Echinocactus pilosus Galeotti species homotypic synonym

Echinocactus peninsulae A.A.Weber species synonym

Hamatocactus uncinatus (Galeotti) Galeotti species homotypic synonym

Echinocactus mathssonii A.Berger ex K.Schum. species synonym

Ferocactus cylindraceus var. cylindraceus variety synonym

Glandulicactus mathssonii (K.Schum.) Wozniak species homotypic synonym

Ferocactus viridescens var. viridescens variety synonym

Thelocactus uncinatus (Galeotti) Buxb. species heterotypic synonym

Echinocactus uncinatus Galeotti species heterotypic synonym

Ferocactus pilifer (Lem.) G.Unger species synonym

Ferocactus pilifer f. flavispinus (Schelle) G.Unger form synonym

Echinocactus agglomeratus Karw. ex Pfeiff. species synonym

Ferocactus pilifer var. stainesii (Salm-Dyck) G.Unger variety synonym

Echinocactus subulifer Link & Otto species synonym

Hamatocactus haematacanthus (Muehlenpf.) F.M.Knuth species synonym

Ferocactus acanthoides var. johnstonianus (Britton & Rose) G.Unger variety homotypic synonym

Cactus multiangularis Voigt ex Steud. species synonym

Echinocactus haematacanthus Muehlenpf. species synonym

Ferocactus acanthoides (Lem.) Britton & Rose species synonym

Brittonia davisiae Houghton species synonym

Brittonia davisiae C.A.Armstr. species synonym

Ferocactus acanthoides var. eastwoodiae L.D.Benson variety synonym

Echinocactus acanthoides Lem. species synonym

Hamatocactus hamatocanthus var. davisiae (Houghton) W.T.Marshall variety synonym

Echinocactus haematacanthus var. longihamatus (Galeotti ex C.F.Först.) J.M.Coult. variety synonym

Cactus multiangularis Voigt species homotypic synonym

Echinocactus haematacanthus var. brevispinus (Engelm.) J.M.Coult. variety synonym

Echinocactus cornigerus var. latispinus (Haw.) Voss variety synonym

Ferocactus emoryi (Engelm.) Orcutt species accepted

Ferocactus cylindraceus (Engelm.) Orcutt species accepted

Ferocactus viridescens (Torr. & A.Gray) Britton & Rose species accepted

Ferocactus wislizeni (Engelm.) Britton & Rose species accepted

Sclerocactus uncinatus (Galeotti) N.P.Taylor species synonym

Echinocactus pilosus f. stainesii (Salm-Dyck) Voss form synonym

Echinocactus pilosus var. pringlei J.M.Coult. variety synonym

Echinocactus pilosus var. flavispinus Schelle variety synonym

Echinocactus piliferus Lem. ex Labour. species synonym

Echinocactus peninsulae Engelm. ex J.M.Coult. species synonym

Sclerocactus uncinatus var. wrightii (Engelm.) N.P.Taylor variety synonym

Sclerocactus uncinatus var. crassihamatus N.P.Taylor variety synonym

Echinocactus johnstonianus (Britton & Rose) Fosberg species synonym

Pediocactus uncinatus var. wrightii (Engelm.) Halda variety synonym

Pediocactus uncinatus var. crassihamatus (F.A.C.Weber) Halda variety synonym

Echinocactus crassihamatus F.A.C.Weber species synonym

Echinocactus bicolor f. pottsii (Salm-Dyck) Voss form synonym

Echinocactus ancylacanthus Monv. ex Labour. species synonym

Ferocactus pottsii (Salm-Dyck) Backeb. species accepted

Hamatocactus wrightii (Engelm.) Orcutt species synonym

Hamatocactus uncinatus var. wrightii (Engelm.) Bravo variety synonym

Hamatocactus uncinatus subsp. crassihamatus (N.P.Taylor) Glass subspecies synonym

Hamatocactus hamatocanthus var. davisii (Houghton) W.T.Marshall variety synonym

Hamatocactus crassihamatus (F.A.C.Weber) Buxb. species synonym

Echinofossulocactus robustus (Otto ex Pfeiff.) Lawr. species synonym

Thelocactus uncinatus var. wrightii (Engelm.) H.P.Kelsey & Dayton variety synonym

Thelocactus pottsii (Salm-Dyck) Britton & Rose species synonym

Ancistrocactus uncinatus subsp. wrightii (Engelm.) Doweld subspecies synonym

Ancistrocactus uncinatus subsp. crassihamatus (F.A.C.Weber) Doweld subspecies synonym

Ancistrocactus mathssonii (A.Berger ex K.Schum.) Doweld species synonym

Thelocactus bicolor var. pottsii (Salm-Dyck) Backeb. variety synonym

Glandulicactus wrightii (Engelm.) D.J.Ferguson species synonym

Glandulicactus uncinatus subsp. wrightii (Engelm.) U.Guzmán subspecies synonym

Glandulicactus mathssonii (A.Berger ex K.Schum.) D.J.Ferguson species synonym

Glandulicactus crassihamatus (F.A.C.Weber) Backeb. species synonym

Echinocactus wrightii (Engelm.) Small species synonym

Ferocactus uncinatus var. wrightii (Engelm.) N.P.Taylor variety synonym

Ferocactus townsendianus var. santa-maria (Britton & Rose) G.E.Linds. variety synonym

Ferocactus stainesii var. pringlei (J.M.Coult.) Backeb. variety synonym

Ferocactus stainesii var. pilosus (Galeotti ex Salm-Dyck) Backeb. variety synonym

Echinocactus uncinatus var. wrightii Engelm. variety synonym

Ferocactus santa-maria Britton & Rose species accepted

Ferocactus robustus (Karw. ex Pfeiff.) Britton & Rose species accepted

Ferocactus pringlei (J.M.Coult.) Britton & Rose species synonym

Ferocactus pilosus (Salm-Dyck) Werderm. species accepted

Ferocactus piliferus var. stainesii (Salm-Dyck) G.Unger variety synonym

Ferocactus piliferus f. flavispinus (Schelle) G.Unger form synonym

Ferocactus peninsulae var. townsendianus (Britton & Rose) N.P.Taylor variety synonym

Ferocactus peninsulae subsp. santa-maria (Britton & Rose) Pilbeam & Bowdery subspecies synonym

Echinocactus subuliferus Link & Otto species synonym

Ferocactus neohaematacanthus Y.Itô, 1981 species accepted

Ferocactus mathssonii (Berge ex K.Schum.) N.P.Taylor species accepted

Ferocactus lindsayi Bravo species accepted

Ferocactus johnstonianus Britton & Rose species accepted

Echinocactus stainesii Hook. ex Salm-Dyck species synonym

Ferocactus horridus Britton & Rose species synonym

Ferocactus cylindraceus var. tortulospinus (H.E.Gates) Bravo variety synonym

Ferocactus crassihamatus (F.A.C.Weber) Britton & Rose species synonym

Ferocactus acanthodes var. johnstonianus (Britton & Rose) G.Unger variety synonym

Echinocactus santa-maria Rose ex Schick species synonym

Echinocactus robustus var. prolifer Pfeiff. variety synonym

Echinocactus robustus var. monstruosus Pfeiff. variety synonym

Echinocactus recurvus var. tricuspidatus Salm-Dyck variety synonym

Echinocactus pringlei (J.M.Coult.) Rose species synonym

Echinocactus pottsii Salm-Dyck species synonym

Ancistrocactus uncinatus (Galeotti) L.D.Benson species synonym

Echinocactus pilosus Galeotti ex Salm-Dyck species synonym

Pediocactus uncinatus (Galeotti) Halda species synonym

Hamatocactus uncinatus (Galeotti) Orcutt species synonym

Hamatocactus hamatocanthus (Houghton) W.T.Marshall species synonym

Echinomastus uncinatus (Galeotti) F.M.Knuth species synonym

Glandulicactus uncinatus (Galeotti) Backeb. species synonym

Glandulicactus uncinatus subsp. uncinatus subspecies synonym

Ferocactus townsendianus Britton & Rose species accepted

Ferocactus stainesii (Hook. ex Salm-Dyck) Britton & Rose species synonym

Ferocactus piliferus (Lem. ex Labour.) G.Unger species synonym

Ferocactus peninsulae (F.A.C.Weber) Britton & Rose species accepted

Ferocactus peninsulae var. peninsulae variety synonym

Ferocactus macrodiscus (Matt.) Britton & Rose species accepted

Ferocactus latispinus (Haw.) Britton & Rose species accepted

Ferocactus gracilis H.E.Gates species accepted

Ferocactus gracilis var. gracilis variety synonym

Ferocactus fordii (Orcutt) Britton & Rose species accepted

Ferocactus fordii var. fordii variety synonym

Ferocactus diguetii (F.A.C.Weber) Britton & Rose species accepted

Ferocactus diguetii var. diguetii variety synonym

Ferocactus coulteri species accepted

Ferocactus chrysacanthus (Orcutt) Britton & Rose species accepted

Echinocactus robustus Otto species synonym

Echinocactus uncinatus Galeotti ex Pfeiff. & Otto species synonym

Echinofossulocactus cornigerus var. rubrospinus Lawr. variety synonym

Echinocactus pilifer Lem. species synonym

Hamatocactus uncinatus (Galeotti) Galeotti ex Borg species synonym

Melocactus prolifer Otto & A.Dietr. species synonym

Melocactus besleri-affinis Pfeiff. species synonym

Echinocactus mathssonii Berge species homotypic synonym

Ferocactus cylindraceus (Engelm.) Y.Itô species doubtful

Echinocactus wrightii J.M.Coult. species synonym

Echinocactus longihamatus Galeotti ex C.F.Först. species synonym

Echinocactus peninsulae L.Weber species synonym

Hamatocactus uncinatus var. wrightii (Engelm.) Borg variety synonym

Ferocactus wislizeni var. wislizeni variety synonym

Echinocactus crassihamatus F.A.C.Weber ex Britton & Rose species synonym

Cactus bicolor Berland. ex Engelm. species heterotypic synonym

Echinocactus agglomeratus Karw. species homotypic synonym

Thelocactus crassihamatus (F.A.C.Weber) W.T.Marshall species synonym

Ancistrocactus crassihamatus (F.A.C.Weber) L.D.Benson species synonym

Thelocactus uncinatus (Galeotti) W.T.Marshall species synonym

Echinocactus piliferus Lem. species homotypic synonym

Echinocactus peninsulae Engelm. species homotypic synonym

Echinocactus ancylacanthus Monv. species homotypic synonym

Echinocactus santa-maria Rose species homotypic synonym

Echinocactus longihamatus Galeotti species synonym

Echinocactus pilosus var. stainesii Salm-Dyck variety synonym

Sclerocactus uncinatus subsp. wrightii (Engelm.) N.P.Taylor subspecies synonym

Sclerocactus uncinatus subsp. crassihamatus (N.P.Taylor) N.P.Taylor subspecies synonym

Echinocactus bicolor var. pottsii Salm-Dyck variety synonym

Echinomastus uncinatus var. wrightii (Engelm.) F.M.Knuth variety synonym

Ancistrocactus uncinatus var. wrightii (Engelm.) L.D.Benson variety synonym

Glandulicactus uncinatus var. wrightii (Engelm.) Backeb. variety synonym

Ferocactus uncinatus (Galeotti) Britton & Rose species accepted

Echinocactus uncinatus f. wrightii (Engelm.) Schelle form synonym

Ferocactus peninsulae subsp. townsendianus (Britton & Rose) Pilbeam & Bowdery subspecies synonym

Ferocactus peninsulae var. santa-maria (Britton & Rose) N.P.Taylor variety synonym