Echinocactus horizonthalonius var. centrispinus Engelm. in Proc. Amer. Acad. Arts 3: 276. 1856
Echinocactus horizonthalonius var. centrispinus in Proc. Amer. Acad. Arts 3: 276. 1856
is basionym for Echinocactus horizonthalonius f. centrispinus, Kakteen: 186. 1926