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 E4F5E2C7-EF54-4D57-B1AF-CD9D35A35824) with original publication details: Rhodora 23 296 1922.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14779-2.
This name was in version 1 of The Plant List, record gcc-66295.