This name is a synonym of Plantago patagonica var. oblonga (Morris) Shinners.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50265031) with original publication details: Bull. Torrey Bot. Club 55(7): 411 1928.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:201566-2.
This name was in version 1 of The Plant List, record tro-50265031, and has not been changed.