This name is a synonym of Popowia greveana (Baill.) Ghesq..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 1600872) with original publication details: Consp. Fl. Afr. 3 1898.
This name was in version 1 of The Plant List, record tro-1600872.