This name is a synonym of Echinopsis maximiliana subsp. caespitosa (J.A.Purpus) M.Lowry.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Monatsschr. Kakteenk. 27: 120 1917.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:88342-2.
This name was in version 1 of The Plant List, record kew-2783315, and has not been changed.