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 50265029) with original publication details: Bull. Torrey Bot. Club 28: 119 1901.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:201460-2.
This name was in version 1 of The Plant List, record tro-50265029, and has not been changed.