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 545C5A4B-C3AD-481F-8C01-295C6C8EEF6D) with original publication details: 863 1991.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1121741-2.
This name was in version 1 of The Plant List, record gcc-22352.