| Ferocactus cylindraceus (Engelm.) Orcutt |
Accepted |
11 |
| Ferocactus echidne (DC.) Britton & Rose |
Accepted |
11 |
| Ferocactus emoryi (Engelm.) Orcutt |
Accepted |
11 |
| Ferocactus fordii (Orcutt) Britton & Rose |
Accepted |
11 |
| Ferocactus glaucescens (DC.) Britton & Rose |
Accepted |
11 |
| Ferocactus gracilis H. E. Gates |
Accepted |
11 |
| Ferocactus histrix (DC.) G. E. Linds. |
Accepted |
11 |
| Ferocactus macrodiscus (Mart.) Britton & Rose |
Accepted |
11 |
| Ferocactus peninsulae var. townsendianus (Britton & Rose) N. P. Taylor |
Accepted |
11 |
| Ferocactus pilosus (Galeotti) Werderm. |
Accepted |
11 |
| Ferocactus viridescens (Nutt.) Britton & Rose |
Accepted |
11 |
| Ferocactus wislizeni (Engelm.) Britton & Rose |
Accepted |
11 |
| Ferocactus pottsii var. alamosanus (Britton & Rose) G. Unger |
Synonym of Ferocactus alamosanus (Britton & Rose) Britton & Rose |
11 |
| Ferocactus acanthodes (Lem.) Britton & Rose |
Synonym of Ferocactus cylindraceus (Engelm.) Orcutt |
11 |
| Ferocactus acanthodes var. lecontei (Engelm.) G. E. Linds. |
Synonym of Ferocactus cylindraceus subsp. lecontei (Engelm.) N. P. Taylor |
11 |
| Ferocactus cylindraceus var. lecontei (Engelm.) Bravo |
Synonym of Ferocactus cylindraceus subsp. lecontei (Engelm.) N. P. Taylor |
11 |
| Ferocactus covillei Britton & Rose |
Synonym of Ferocactus emoryi (Engelm.) Orcutt |
11 |
| Ferocactus fordii var. fordii |
Synonym of Ferocactus fordii (Orcutt) Britton & Rose |
11 |
| Ferocactus gracilis var. gracilis |
Synonym of Ferocactus gracilis H. E. Gates |
11 |
| Ferocactus hamatacanthus var. hamatacanthus |
Synonym of Ferocactus hamatacanthus (Muehlenpf.) Britton & Rose |
11 |
| Ferocactus horridus Britton & Rose |
Synonym of Ferocactus peninsulae (A. A. Weber) Britton & Rose |
11 |
| Ferocactus peninsulae var. peninsulae |
Synonym of Ferocactus peninsulae (A. A. Weber) Britton & Rose |
11 |
| Ferocactus pringlei (Coult.) Britton & Rose |
Synonym of Ferocactus pilosus (Galeotti) Werderm. |
11 |
| Ferocactus stainesii (Hook.) Britton & Rose |
Synonym of Ferocactus pilosus (Galeotti) Werderm. |
11 |
| Echinocactus latispinus var. flavispinus (J. N. Haage) F. A. C. Weber |
Synonym of Ferocactus recurvus (Mill.) Borg |
11 |
| Ferocactus latispinus (Haw.) Britton & Rose |
Synonym of Ferocactus recurvus (Mill.) Borg |
11 |
| Ferocactus viridescens var. viridescens |
Synonym of Ferocactus viridescens (Nutt.) Britton & Rose |
11 |
| Ferocactus wislizeni (Engelmann) Britton & Rose |
Synonym of Ferocactus wislizeni (Engelm.) Britton & Rose |
11 |
| Ferocactus wislizeni Engelm. |
Synonym of Ferocactus wislizeni (Engelm.) Britton & Rose |
11 |
| Ferocactus setispinus (Engelm.) L. D. Benson |
Synonym of Thelocactus setispinus (Engelm.) E. F. Anderson |
11 |
