This name is a synonym of Senecio leucanthemifolius subsp. caucasicus (DC.) Greuter.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 2E263337-17D7-480A-AC8F-646BA55609C6) with original publication details: 89 1957.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:247658-1.
This name was in version 1 of The Plant List, record gcc-76318, and has not been changed.