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 240647) with original publication details: Ann. New York Acad. Sci. 7: 240 1893.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:318389-1.
This name was in version 1 of The Plant List, record kew-240647, and has not been changed.