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 AF43A795-1DBC-4DDB-90F1-55C7436C6FBD) 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:14762-2.
This name was in version 1 of The Plant List, record gcc-46278.