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 13B14F22-F43E-4CDC-A86E-96A92E941139) with original publication details: Phytologia 23 59 1972.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14711-2.
This name was in version 1 of The Plant List, record gcc-98687.