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 5499D363-BB0C-4EB9-8CF5-6996CC772E97) with original publication details: Bot. Explor. St. Lawrence 126 55 1922.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14872-2.
This name was in version 1 of The Plant List, record gcc-53892.