This name is a synonym of Trema orientalis (L.) Blume.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 33300157) with original publication details: Pl. Ut. Afr. Portug. 261 1884.
This name record (from Tropicos) 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 Trema guineensis in version 1 of The Plant List.