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 9D9A9EAD-98F3-4CEE-8B75-2AD117169DE4) with original publication details: 14 1922.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14631-2.
This name was in version 1 of The Plant List, record gcc-23130.