This name is a synonym of Antennaria howellii subsp. neodioica (Greene) R.J.Bayer.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record EB95849F-8A5B-4E2B-8B4A-647247CDE326) with original publication details: Pittonia 3: 184. 1897 184 1897.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:272193-2.
This name was in version 1 of The Plant List, record gcc-76334.