This name is a synonym of Echinopsis mamillosa Gürke.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Kakteen 16: Gen. C v a Feb. 1961.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:132697-1.
This name was in version 1 of The Plant List, record kew-2783475, and has not been changed.