This name is a synonym of Syzygium cordifolium subsp. spissum (Alston) P.S.Ashton.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 132297) with original publication details: Sp. Pl. 472 1753.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:599585-1.
This name was in version 1 of The Plant List, record kew-132297, and has not been changed.