This name is a synonym of Antennaria howellii subsp. petaloidea R.J.Bayer.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 4D795FB1-FA72-4FAF-A1C3-36D82EE58A26) with original publication details: Pittonia 3: 175. 1897 175 1897.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:272197-2.
This name was in version 1 of The Plant List, record gcc-29673.