This name is a synonym of Ziziphus amole (Sessé & Moc.) M.C. Johnst..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50337733) with original publication details: Repert. Spec. Nov. Regni Veg. 50: 332 1941.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:271233-2.
This name was in version 1 of The Plant List, record tro-50337733.