This name is a synonym of Echinopsis pugionacantha Rose & Boed..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50138405) with original publication details: Succulenta (Netherlands) 53(4): 62 1974.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:142802-2.
This name was in version 1 of The Plant List, record tro-50138405.