This name is a synonym of Pyrrocoma hirta (A.Gray) Greene.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 0AF2D715-094F-448E-9202-3FB50610C5E3).
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 Haplopappus hirtus in version 1 of The Plant List.