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 FE1F077B-BE7A-4B76-904E-D3BF8DB5870C) with original publication details: Rhodora 35 345 1933.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14783-2.
This name was in version 1 of The Plant List, record gcc-67053.