This name is a synonym of Acokanthera rotundata (Codd) Kupicha.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 2172) with original publication details: Bothalia 7: 449 1961.
This name was in version 1 of The Plant List, record kew-2172, and has not been changed.