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 8502353) with original publication details: Prodr. 9: 390 1845.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:269483-1.
This name was in version 1 of The Plant List, record tro-8502353.