This name is a synonym of Senecio leucanthemifolius subsp. vernalis (Waldst. & Kit.) Greuter.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record B18F418B-2EFE-433F-BD7D-8C5AF04B3827) with original publication details: 60 1956.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:245047-1.
This name was in version 1 of The Plant List, record gcc-94164.