This name is a synonym of Dioscorea pilcomayensis Hauman.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name (record 240648) with original publication details: Pflanzenr. IV, 43: 108 1924.
This name was in version 1 of The Plant List, record kew-240648, and has not been changed.