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: Folia Geobot. Phytotax. 19: 214 1984.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:923204-1.
This name was in version 1 of The Plant List, record kew-2764848, and has not been changed.