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 9D6D1571-B8D0-4033-B945-C77F7D266BD9) with original publication details: Rhodora 23 296 1922.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14818-2.
This name was in version 1 of The Plant List, record gcc-65532.