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: Sched. Fl. Exs. Austro-Hung. 2: 539 1882 publ. 1883.
This name was in version 1 of The Plant List, record kew-2764731, and has not been changed.