This name is a synonym of Dianthus plumarius subsp. regis-stephani (Rapaics) Boksay.
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. 9: 273 1974.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:875781-1.
This name was in version 1 of The Plant List, record kew-2764366, and has not been changed.