This name is a synonym of Psophocarpus tetragonolobus (L.) DC..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13057316) with original publication details: Revis. Gen. Pl. 1: 162 1891.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:482116-1.
This name was in version 1 of The Plant List, record tro-13057316, and has not been changed.