This name is a synonym of Saxifraga oppositifolia subsp. amphibia (Sünd.) 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: Mitt. Bayer. Bot. Ges. 2: 190 1909.
This name was in version 1 of The Plant List, record kew-2583436, and has not been changed.