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 3060AAD6-2402-4227-97D0-1C4993E3682C) with original publication details: 213 1899.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14793-2.
This name was in version 1 of The Plant List, record gcc-15280.