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 13007131) with original publication details: Bol. Acad. Nac. Ci. 26(2): 301, pl. 20f 1923.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:299272-2.
This name was in version 1 of The Plant List, record tro-13007131.