Echinocactus setispinus var. hamatus (Muehlenpf.) Engelm. in Boston J. Nat. Hist. 6: 102. 1850.

Nomenclatural References

• person : George Engelmann (1809-1884) Based on occurrence of standard abbreviation 'Engelm.' in the authors string.
• person : Philipp August Friedrich Mühlenpfordt (1803-1891) Based on occurrence of standard abbreviation 'Muehlenpf.' in the authors string.
• database : The Plant List version 1.0, record: kew-2782296
• database : The Plant List version 1.1, record: kew-2782296