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 D7A794AA-D8C7-4410-9B23-F9231FC71BEE) with original publication details: Syst. Bot. 7 309 1982.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:920512-1.
This name was in version 1 of The Plant List, record gcc-71833.