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 6160CCE3-5E43-416D-8D01-892FAEC73A9E) with original publication details: Contr. U. S. Natl. Herb. 11 604 1906.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14649-2.
This name was in version 1 of The Plant List, record gcc-92700.