This name is a synonym of Dioscorea cayennensis subsp. rotundata (Poir.) J.Miège.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 240844) with original publication details: Encycl. Suppl. 3: 139 1813.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:318525-1.
This name was in version 1 of The Plant List, record kew-240844, and has not been changed.