This name is a synonym of Ziziphus mistol Griseb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 27500138) with original publication details: Trans. Linn. Soc. London, Bot. 4: 339, pl. 24 1895.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:271221-2.
This name was in version 1 of The Plant List, record tro-27500138, and has not been changed.