This name is a synonym of Argemone polyanthemos (Fedde) Ownbey.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Pacif. Railr. Rep. Parke, Bot. 12(2): 40 1860.
This name was in version 1 of The Plant List, record kew-2650512, and has not been changed.