This name is a synonym of Gongylanthus liebmannianus (Lindenb. & Gottsche) Stephani.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 35187110) with original publication details: 1863.
This name was in version 1 of The Plant List, record tro-35187110, and has not been changed.