This name is a synonym of Artemisia ludoviciana subsp. redolens (A.Gray) D.D.Keck.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 31A4C0B0-BA28-4936-96A1-56818A3206C4) with original publication details: Proc. Amer. Acad. Arts 21 393 1886.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:20743-2.
This name was in version 1 of The Plant List, record gcc-46669.