This name is a synonym of Smilax riparia A.DC..
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 288914) with original publication details: Bot. Mag. (Tokyo) 65: 168 1952.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:541821-1.
This name was in version 1 of The Plant List, record kew-288914.