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 5108166) with original publication details: Proc. Amer. Acad. Arts 3: 294 1856.
This name was in version 1 of The Plant List, record tro-5108166, and has not been changed.