This name is a synonym of Calystegia silvatica (Kit.) Griseb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8502227) with original publication details: Neues J. Bot. 1(1): 163 1805.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:266986-1.
This name was in version 1 of The Plant List, record tro-8502227.