This name is a synonym of Vigna unguiculata subsp. sesquipedalis (L.) Verdc..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13040433) with original publication details: Philipp. J. Sci. 11: 92 (Sect. A) 1916.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:525516-1.
This name was in version 1 of The Plant List, record tro-13040433, and has not been changed.