This name is a synonym of Dioscorea japonica Thunb..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 240190) with original publication details: Enum. Pl. 5: 402 1850.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:318012-1.
This name was in version 1 of The Plant List, record kew-240190.