| Ferocactus cylindraceus |
| Authority | : | (Engelm.) Orcutt, 1926 |
| Synonyms | : | Echinocactus viridescens var. cylindraceus Engelm. 1852 |
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| Beaver dam (Arizona), USA; 5 August 2017. |
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| Bunkerville (Nevada), USA; 5 August 2017. | |
| Ferocactus cylindraceus |
| Authority | : | (Engelm.) Orcutt, 1926 |
| Synonyms | : | Echinocactus viridescens var. cylindraceus Engelm. 1852 |
|
| Beaver dam (Arizona), USA; 5 August 2017. |
|
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| Bunkerville (Nevada), USA; 5 August 2017. | |