This name is a synonym of Artemisia ludoviciana subsp. candicans (Rydb.) D.D.Keck.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 3DF0E25B-60FF-4390-AA2D-94FD9510362B) with original publication details: Bull. Torrey Bot. Club 24 296 1897.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:20574-2.
This name was in version 1 of The Plant List, record gcc-97929, and has not been changed.