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 49DC8E07-7536-45AB-95B7-5BBC491D5593) with original publication details: Rhodora 16 132 1914.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14787-2.
This name was in version 1 of The Plant List, record gcc-49497.