This name is a synonym of Vachellia caven (Molina) Seigler & Ebinger.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50103100) with original publication details: Ann. Missouri Bot. Gard. 79(4): 964 1992.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:303587-2.
This name was in version 1 of The Plant List, record tro-50103100.