This name is a synonym of Antennaria howellii subsp. canadensis (Greene) R.J.Bayer.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 41020259-8564-4D5E-AAF1-D29792A36C77).
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 Antennaria canadensis in version 1 of The Plant List.