This name is a synonym of Glenniea unijuga (Thwaites) Hook.f..
The record derives from WCSP (in review)
(data supplied on 2012-03-26)
which reports it as a synonym with original publication details: J. Ceylon Branch Roy. Asiat. Soc. 9: 20 1885.
This name record (from WCSP (in review)) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Glenniea zeylanica in version 1 of The Plant List.