This name is a synonym of Ziziphus exserta DC..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Nov. Actorum Acad. Caes. Leop.-Carol. Nat. Cur. 19(Suppl. 1): 424 1843.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:851051-1.
This name was in version 1 of The Plant List, record kew-2708259.