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 25200121) with original publication details: Prodr. 13(1): 711 1852.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:685440-1.
This name was in version 1 of The Plant List, record tro-25200121.