This name is a synonym of Antennaria howellii subsp. neodioica (Greene) R.J.Bayer.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record AC41EEBD-F6FA-4194-9EF8-B23B163B5C93) with original publication details: Phytologia 23 61 1972.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:14858-2.
This name was in version 1 of The Plant List, record gcc-111030.