This name is a synonym of Dioscorea nipponica Makino.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 240570) with original publication details: Acta Phytotax. Sin. 17(3): 70 1979.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:879860-1.
This name was in version 1 of The Plant List, record kew-240570.