This name is a synonym of Acokanthera schimperi (A.DC.) Schweinf..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 1805759) with original publication details: Gen. Pl. 2: 696 1873.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:76354-1.
This name was in version 1 of The Plant List, record tro-1805759, and has not been changed.