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 42D96460-F99A-43CB-87F9-664922B453E5) with original publication details: Rhodora 47 184 1945.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14768-2.
This name was in version 1 of The Plant List, record gcc-53443.