This name is a synonym of Artemisia laciniata subsp. parryi (A.Gray) W.A.Weber.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record E8C33241-5813-4185-922D-5B6030FF197E) with original publication details: Proc. Amer. Acad. Arts 7 361 1868.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:272702-2.
This name was in version 1 of The Plant List, record gcc-49332, and has not been changed.