This name is a synonym of Scorzonera humilis L..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 1A8E7488-5850-421D-B8CA-0D8F704BEBBB).
This name record (from TICA) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Scorzonera plantaginea in version 1 of The Plant List.