This name is a synonym of Calibrachoa serrulata (L.B.Sm. & Downs) Stehmann & Semir.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 29606675) with original publication details: Phytologia 10: 440 1964.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:191285-2.
This name was in version 1 of The Plant List, record tro-29606675, and has not been changed.