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 13012883) with original publication details: Anales Ci. Parag. 9: 16 1911.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:265184-2.
This name was in version 1 of The Plant List, record tro-13012883, and has not been changed.