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 3CB61E0C-9271-4D7A-A99A-CD8F2FDB9DBA) with original publication details: Proc. U. S. Natl. Mus. 23 710 1901.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14817-2.
This name was in version 1 of The Plant List, record gcc-66285.