This name is a synonym of Cynanchum blandum (Decne.) Sundell.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 2610283) with original publication details: Bol. Mus. Bot. Munic. 45: 6 1981.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:250135-2.
This name was in version 1 of The Plant List, record tro-2610283.