| Ferocactus acanthodes (Lem.) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus acanthodes var. eastwoodiae L.D.Benson |
Accepted |
 |
WCSP (in review) |
| Ferocactus acanthodes var. johnstonianus (Britton & Rose) G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus acanthodes var. lecontei (Engelm.) G.E.Linds. |
Synonym |
 |
WCSP (in review) |
| Ferocactus acanthodes var. rostii (Britton & Rose) W.T.Marshall |
Synonym |
 |
WCSP (in review) |
| Ferocactus alamosanus (Britton & Rose) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus alamosanus var. platygonus G.E.Linds. |
Synonym |
 |
WCSP (in review) |
| Ferocactus alamosanus subsp. reppenhagenii (G.Unger) N.P.Taylor |
Accepted |
 |
WCSP (in review) |
| Ferocactus arizonicus (R.E.Kunze) Orcutt |
Synonym |
 |
WCSP (in review) |
| Ferocactus bicolor (Galeotti ex Pfeiff.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus bicolor var. bolaensis (Runge) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus californicus (Monv. ex Labour.) Borg |
Synonym |
 |
WCSP (in review) |
| Ferocactus chrysacanthus (Orcutt) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus chrysacanthus subsp. grandiflorus (G.E.Linds.) N.P.Taylor |
Accepted |
 |
WCSP (in review) |
| Ferocactus chrysacanthus f. rubrispinus (Ford ex Orcutt) G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus coloratus H.E.Gates |
Synonym |
 |
WCSP (in review) |
| Ferocactus coptonogonus (Lem.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus covillei Britton & Rose |
Synonym |
 |
WCSP (in review) |
| Ferocactus crassihamatus (A.A.Weber) Britton & Rose |
Unresolved |
 |
WCSP (in review) |
| Ferocactus crispatus (DC.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus cylindraceus (Engelm.) Orcutt |
Synonym |
 |
WCSP (in review) |
| Ferocactus cylindraceus var. eastwoodiae (L.D.Benson) N.P.Taylor |
Synonym |
 |
WCSP (in review) |
| Ferocactus cylindraceus subsp. eastwoodiae (L.D.Benson) N.P.Taylor |
Synonym |
 |
WCSP (in review) |
| Ferocactus cylindraceus var. greenwoodiae (Glass) N.P.Taylor |
Synonym |
 |
WCSP (in review) |
| Ferocactus cylindraceus var. lecontei (Engelm.) Bravo |
Synonym |
 |
WCSP (in review) |
| Ferocactus cylindraceus subsp. lecontei (Engelm.) N.P.Taylor |
Synonym |
 |
WCSP (in review) |
| Ferocactus diguetii (A.A.Weber) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus diguetii var. carmenensis G.E.Linds. |
Synonym |
 |
WCSP (in review) |
| Ferocactus diguetii subsp. carmenensis (G.E.Linds.) F.Wolf & R.Wolf |
Synonym |
 |
WCSP (in review) |
| Ferocactus eastwoodiae (L.D.Benson) L.D.Benson |
Synonym |
 |
WCSP (in review) |
| Ferocactus echidne (DC.) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus echidne var. rhodanthus G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus echidne var. victoriensis (Rose) G.E.Linds. |
Synonym |
 |
WCSP (in review) |
| Ferocactus emoryi (Engelm.) Orcutt |
Accepted |
 |
WCSP (in review) |
| Ferocactus emoryi var. rectispinus (Engelm.) N.P.Taylor |
Synonym |
 |
WCSP (in review) |
| Ferocactus emoryi subsp. rectispinus (Engelm.) N.P.Taylor |
Accepted |
 |
WCSP (in review) |
| Ferocactus falconeri (Orcutt) Orcutt |
Synonym |
 |
WCSP (in review) |
| Ferocactus flavovirens (Scheidw.) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus fordii (Orcutt) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus fordii var. grandiflorus G.E.Linds. |
Unresolved |
 |
WCSP (in review) |
| Ferocactus gatesii G.E.Linds. |
Synonym |
 |
WCSP (in review) |
| Ferocactus glaucescens (DC.) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus glaucus (K.Schum.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus gracilis H.E.Gates |
Accepted |
 |
WCSP (in review) |
| Ferocactus gracilis var. coloratus (H.E.Gates) G.E.Linds. |
Synonym |
 |
WCSP (in review) |
| Ferocactus gracilis subsp. coloratus (H.E.Gates) N.P.Taylor |
Accepted |
 |
WCSP (in review) |
| Ferocactus gracilis subsp. gatesii (G.E.Linds.) N.P.Taylor |
Accepted |
 |
WCSP (in review) |
| Ferocactus × grandiflorus (G.E.Linds.) G.Unger |
Unresolved |
 |
WCSP (in review) |
| Ferocactus haematacanthus (Monv. ex Salm-Dyck) Bravo ex Backeb. & F.M.Knuth |
Accepted |
 |
WCSP (in review) |
| Ferocactus hamatacanthus (Muehlenpf.) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus hamatacanthus subsp. hamatacanthus |
Accepted |
 |
TRO |
| Ferocactus hamatacanthus var. sinuatus (A.Dietr) L.D.Benson |
Synonym |
 |
WCSP (in review) |
| Ferocactus hamatacanthus subsp. sinuatus (A.Dietr.) N.P.Taylor |
Accepted |
 |
WCSP (in review) |
| Ferocactus hastifer (Werderm. & Boed.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus herrerae J.G.Ortega |
Accepted |
 |
WCSP (in review) |
| Ferocactus heterochromus (A.A.Weber) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus histrix (DC.) G.E.Linds. |
Accepted |
 |
WCSP (in review) |
| Ferocactus histrix Lindsay |
Unresolved |
 |
TRO |
| Ferocactus horridus Britton & Rose |
Synonym |
 |
WCSP (in review) |
| Ferocactus johnsonii (Parry ex Engelm.) Britton & Rose |
Unresolved |
 |
WCSP (in review) |
| Ferocactus johnstonianus Britton & Rose |
Synonym |
 |
WCSP (in review) |
| Ferocactus latispinus (Haw.) Britton & Rose |
Synonym |
 |
WCSP (in review) |
| Ferocactus latispinus var. flavispinus (J.N.Haage) Backeb. & F.M.Knuth |
Synonym |
 |
WCSP (in review) |
| Ferocactus latispinus var. greenwoodii (Glass) N.P.Taylor |
Synonym |
 |
WCSP (in review) |
| Ferocactus latispinus subsp. greenwoodii (Glass) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus latispinus var. spiralis (Karw. ex Pfeiff.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus latispinus subsp. spiralis (Karw. ex Pfeiff.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus lecontei (Engelm.) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus leucacanthus (Zucc. ex Pfeiff.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus lindsayi Bravo |
Accepted |
 |
WCSP (in review) |
| Ferocactus macrodiscus (Mart.) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus macrodiscus var. septentrionalis J.Meyrán |
Synonym |
 |
WCSP (in review) |
| Ferocactus macrodiscus subsp. septentrionalis (J.Meyrán) N.P.Taylor |
Accepted |
 |
WCSP (in review) |
| Ferocactus mathssonii (A.Berger ex K.Schum.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus melocactiformis (DC.) Britton & Rose |
Unresolved |
 |
WCSP (in review) |
| Ferocactus mesae-verdae (Boissev. & C.Davidson ex Marshall & Bloc) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus nobilis (L.) Britton & Rose |
Synonym |
 |
WCSP (in review) |
| Ferocactus orcuttii (Engelm. ex Orcutt) Britton & Rose |
Synonym |
 |
WCSP (in review) |
| Ferocactus parviflorus (Clover & Jotter) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus peninsulae (A.A.Weber) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus peninsulae var. coloratus (H.E.Gates) G.Unger |
Unresolved |
 |
WCSP (in review) |
| Ferocactus peninsulae var. gracilis (H.E.Gates) G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus peninsulae var. santa-maria (Britton & Rose) N.P.Taylor |
Accepted |
 |
WCSP (in review) |
| Ferocactus peninsulae subsp. santa-maria (Britton & Rose) Pilbeam & Bowdery |
Synonym |
 |
WCSP (in review) |
| Ferocactus peninsulae var. townsendianus (Britton & Rose) N.P.Taylor |
Accepted |
 |
WCSP (in review) |
| Ferocactus peninsulae subsp. townsendianus (Britton & Rose) Pilbeam & Bowdery |
Unresolved |
 |
WCSP (in review) |
| Ferocactus peninsulae var. viscainensis (H.E.Gates) G.E.Linds. |
Synonym |
 |
WCSP (in review) |
| Ferocactus peninsulae subsp. viscainensis (H.E.Gates) F.Wolf & R.Wolf |
Synonym |
 |
WCSP (in review) |
| Ferocactus pfeifferi (Zucc.) Backeb. [Invalid] |
Synonym |
 |
WCSP (in review) |
| Ferocactus phoeniceus (R.E.Kunze) Orcutt |
Synonym |
 |
WCSP (in review) |
| Ferocactus phyllacanthus (Mart.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus piliferus (Lem. ex Labour.) G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus piliferus f. flavispinus (Schelle) G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus piliferus var. stainesii (Salm-Dyck) G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus pilosus (Galeotti ex Salm-Dyck) Werderm. |
Accepted |
 |
WCSP (in review) |
| Ferocactus polyancistrus (Engelm. & J.M.Bigelow) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus pottsii (Salm-Dyck) Backeb. |
Accepted |
 |
WCSP (in review) |
| Ferocactus pottsii var. alamosanus (Britton & Rose) G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus pringlei (Coult.) Britton & Rose |
Synonym |
 |
WCSP (in review) |
| Ferocactus pubispinus (Engelm.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus rafaelensis (J.A.Purpus) Borg |
Synonym |
 |
WCSP (in review) |
| Ferocactus rectispinus (Engelm.) Britton & Rose |
Synonym |
 |
WCSP (in review) |
| Ferocactus recurvus (Mill.) Borg |
Accepted |
 |
WCSP (in review) |
| Ferocactus recurvus f. flavispinus (Haage ex C.F.Först.) G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus recurvus var. greenwoodiae Glass |
Synonym |
 |
WCSP (in review) |
| Ferocactus recurvus subsp. greenwoodiae (Glass) Pilbeam & Bowdery |
Synonym |
 |
WCSP (in review) |
| Ferocactus recurvus var. latispinus (Haw.) G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus recurvus f. spiralis (Karw. ex Pfeiff.) G.Unger |
Unresolved |
 |
WCSP (in review) |
| Ferocactus reppenhagenii G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus robustus (Karw. ex Pfeiff.) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus rostii Britton & Rose |
Synonym |
 |
WCSP (in review) |
| Ferocactus santa-maria Britton & Rose |
Synonym |
 |
WCSP (in review) |
| Ferocactus scheeri (Salm-Dyck) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus schwarzii G.E.Linds. |
Accepted |
 |
WCSP (in review) |
| Ferocactus setispinus (Engelm.) L.D.Benson |
Unresolved |
 |
WCSP (in review) |
| Ferocactus spinosior (Engelm.) N.P.Taylor |
Synonym |
 |
WCSP (in review) |
| Ferocactus stainesii (Hook. ex Salm-Dyck) Britton & Rose |
Synonym |
 |
WCSP (in review) |
| Ferocactus stainesii var. haematacanthus (Salm-Dyck) Backeb. |
Synonym |
 |
WCSP (in review) |
| Ferocactus stainesii var. pilosus (Galeotti ex Salm-Dyck) Backeb. |
Synonym |
 |
WCSP (in review) |
| Ferocactus stainesii var. pringlei (J.M.Coult.) Backeb. |
Synonym |
 |
WCSP (in review) |
| Ferocactus tiburonensis (G.Lindsay) Backeb. |
Unresolved |
 |
WCSP (in review) |
| Ferocactus tobuschii (W.T.Marshall) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus tortulispinus H.E.Gates |
Accepted |
 |
WCSP (in review) |
| Ferocactus townsendianus Britton & Rose |
Unresolved |
 |
WCSP (in review) |
| Ferocactus townsendianus var. santa-maria (Britton & Rose) G.E.Linds. |
Synonym |
 |
WCSP (in review) |
| Ferocactus uncinatus (Galeotti ex Pfeiff.) Britton & Rose |
Unresolved |
 |
WCSP (in review) |
| Ferocactus vaupelianus (Werderm.) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus victoriensis (Rose) Backeb. |
Synonym |
 |
WCSP (in review) |
| Ferocactus viridescens (Nutt. ex Torr. & A.Gray) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus viridescens var. littoralis G.E.Linds. |
Synonym |
 |
WCSP (in review) |
| Ferocactus viridescens subsp. littoralis (G.E.Linds.) F.Wolf & R.Wolf |
Synonym |
 |
WCSP (in review) |
| Ferocactus viridescens var. orcuttii (Engelm. ex Orcutt) G.Unger |
Synonym |
 |
WCSP (in review) |
| Ferocactus viridescens subsp. orcuttii (Engelm. ex Orcutt) F.Wolf & R.Wolf |
Synonym |
 |
WCSP (in review) |
| Ferocactus viscainensis H.E.Gates |
Synonym |
 |
WCSP (in review) |
| Ferocactus whipplei (Engelm. & J.M.Bigelow) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |
| Ferocactus wislizeni (Engelm.) Britton & Rose |
Accepted |
 |
WCSP (in review) |
| Ferocactus wislizeni var. albispinus (Toumey) Y.Itô |
Synonym |
 |
WCSP (in review) |
| Ferocactus wislizeni var. herrerae (J.G.Ortega) N.P.Taylor |
Synonym |
 |
WCSP (in review) |
| Ferocactus wislizeni subsp. herrerae (J.G.Ortega) Pilbeam & Bowdery |
Synonym |
 |
WCSP (in review) |
| Ferocactus wislizeni var. phoeniceus (R.E.Kunze) Y.Itô |
Synonym |
 |
WCSP (in review) |
| Ferocactus wislizeni var. tiburonensis G.E.Linds. |
Synonym |
 |
WCSP (in review) |
| Ferocactus wislizeni subsp. tiburonensis (G.E.Linds.) Pilbeam & Bowdery |
Synonym |
 |
WCSP (in review) |
| Ferocactus wrightiae (L.D.Benson) N.P.Taylor |
Unresolved |
 |
WCSP (in review) |