This name is a synonym of Symphostemon insolitus (C.H.Wright) Hiern.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 45972) with original publication details: Ann. Soc. Sci. Bruxelles, Sér. B 49: 94 1929.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:446033-1.
This name was in version 1 of The Plant List, record kew-45972, and has not been changed.