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 F92A009C-9A83-437C-A240-EE05FA6D134A) with original publication details: Phytologia 23 60 1972.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14786-2.
This name was in version 1 of The Plant List, record gcc-70428.