This name is a synonym of Plantago sericea Ruiz & Pav..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25200107) with original publication details: Notizbl. Bot. Gart. Berlin-Dahlem 10: 833 1929.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:201327-2.
This name was in version 1 of The Plant List, record tro-25200107.