This name is a synonym of Artemisia ludoviciana subsp. incompta (Nutt.) D.D.Keck.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record BF44397C-FFE8-448F-AF6C-CAD11E8F3F51) with original publication details: Vasc. Pl. Pacific NorthW. 5 63 1955.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:20687-2.
This name was in version 1 of The Plant List, record gcc-65937.