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 6A09E809-B84F-423A-B6AD-923A6631AD0E) with original publication details: Rhodora 16 133 1914.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14820-2.
This name was in version 1 of The Plant List, record gcc-58901.