This name is a synonym of Dioscorea soso Jum. & H.Perrier.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 453422) with original publication details: Notul. Syst. (Paris) 14: 135 1951.
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 soso in version 1 of The Plant List.