This name is a synonym of Plantago australis Lam..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50298662) with original publication details: Bot. Texana 60: 50 1964.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:201210-2.
This name was in version 1 of The Plant List, record tro-50298662.