This name is a synonym of Sedum maximum subsp. ruprechtii (Jalas) Soó.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Novosti Sist. Vyssh. Rast. 6: 115 1970.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:276111-1.
This name was in version 1 of The Plant List, record kew-2489096, and has not been changed.