This name is a synonym of Dioscorea convolvulacea subsp. grandifolia (Schltdl.) Uline ex R.Knuth.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 240203) with original publication details: Linnaea 17: 602 1843.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:318024-1.
This name was in version 1 of The Plant List, record kew-240203, and has not been changed.