This name is a synonym of Dioscorea diamantinensis R.Knuth.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 240246) with original publication details: Notizbl. Bot. Gart. Berlin-Dahlem 7: 209 1917.
This name was in version 1 of The Plant List, record kew-240246, and has not been changed.