Ferocactus herrrerae (J. G. Ortega 1927) Its main differences are the number of ribs, which are usually 13, the shorter, sturdier, and flatter central spine, and the radial spines, which are somewhat finer, flatter, and twisted.
Ferocactus wislizeni ((Engelmann) Britton & Rose 1922) Etymology: Dedicated to Dr. Wislizenus, the first collector of this species, who sent the collected specimens to Dr. Engelmann.