This name is a synonym of Opuntia macrorhiza subsp. pottsii (Salm-Dyck) U. Guzmán & Mandujano.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 5108165) with original publication details: Cact. Hort. Dyck. [ed. 1849] 239 1849.
This name was in version 1 of The Plant List, record tro-5108165, and has not been changed.