This name is a synonym of Sonchus megalocarpa (Hook.f.) J.M.Black.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record EA1241E7-8A1F-40C7-A32B-2A0E3698A80E) with original publication details: Telopea 1: 130 (1976) 130 1976.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:174946-1.
This name was in version 1 of The Plant List, record gcc-22726.