This name is a synonym of Dioscorea hamiltonii Hook.f..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 453420) with original publication details: Symb. Sin. 7: 1241 1936.
This name record (from WCSP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Dioscorea persimilis in version 1 of The Plant List.