Echinocactus horizonthalonius f. curvispinus (Salm-Dyck) Schelle, Handb. Kakteenkult.: 146. 1907
Echinocactus horizonthalonius f. curvispinus, Handb. Kakteenkult.: 146. 1907
is new combination for Echinocactus horizonthalonius var. curvispinus, Cact. Hort. Dyck., ed. 1849: 146. 1850