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 50319840) with original publication details: Bot. Tidsskr. 73(2): 111 1978.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:201546-2.
This name was in version 1 of The Plant List, record tro-50319840.