This name is a synonym of Petunia axillaris (Lam.) Britton, Sterns & Poggenb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 29600084) with original publication details: Pap. Michigan Acad. Sci. 13: 213 1931.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:282566-2.
This name was in version 1 of The Plant List, record tro-29600084.