This name is a synonym of Pachypodium namaquanum (Wyley ex Harv.) Welw..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 3028) with original publication details: Thes. Cap. 2: 11 1863.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:76367-1.
This name was in version 1 of The Plant List, record kew-3028, and has not been changed.