This name is a synonym of Calibrachoa scabridula (C.V.Morton) Stehmann.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 29607607) with original publication details: Contr. U.S. Natl. Herb. 29: 73 1944.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:191283-2.
This name was in version 1 of The Plant List, record tro-29607607, and has not been changed.