This name is a synonym of Plantago insularis var. scariosa (E. Morris) Jeps..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50141111) with original publication details: Bull. Torrey Bot. Club 27(3): 117 1900.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:298768-2.
This name was in version 1 of The Plant List, record tro-50141111.