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 and as an illegitimate name (record 240338) with original publication details: Pflanzenr. IV, 43: 263 1924.
This name was in version 1 of The Plant List, record kew-240338.