This name is a synonym of Saxifraga oppositifolia subsp. murithiana Braun-Blanq..
The record derives from WCSP (in review)
(data supplied on 2012-03-26)
which reports it as a synonym with original publication details: Ill. Fl. Mitt.-Eur. 4(2): 579 1922.
This name was in version 1 of The Plant List, record kew-2871903, and has not been changed.