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: Ann. Bot. Soc. Zool.-Bot. Fenn. "Vanamo" 26: 33 1954.
This name was in version 1 of The Plant List, record kew-2871611, and has not been changed.