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 E3B7559B-D105-4D3D-926C-C7DAABE3FD14) with original publication details: Rhodora 1 73 1899.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14819-2.
This name was in version 1 of The Plant List, record gcc-65577.