This name is a synonym of Dioscorea quinquelobata Thunb..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 240804) with original publication details: Fl. Jap. 150 1784.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:318493-1.
This name was in version 1 of The Plant List, record kew-240804, and has not been changed.