This name is a synonym of Dianthus giganteiformis subsp. pontederae (A.Kern.) Soó.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Allg. Bot. Z. Syst. 17: 16 1911.
This name was in version 1 of The Plant List, record kew-2870729, and has not been changed.