This name is a synonym of Symphyotrichum anticostense (Fernald) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record D35AC252-7F43-4A0B-8B85-570C68EF8A76) with original publication details: Phytologia 23 34 1972.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23541-2.
This name was in version 1 of The Plant List, record gcc-46969.