This name is a synonym of Ipomoea nil (L.) Roth.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8501538) with original publication details: Syn. Fl. N. Amer. (ed. 2) 1(2): 433 1886.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:129381-2.
This name was in version 1 of The Plant List, record tro-8501538.