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 D531D26D-2A7E-482F-A0E2-20D14FE244EE) with original publication details: Pittonia 3: 275. 1898 275 1898.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:272182-2.
This name was in version 1 of The Plant List, record gcc-17775.