This name is a synonym of Symphyotrichum laurentianum (Fernald) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 7CD91E0B-3CB0-40C7-9954-3F0C03558735) with original publication details: 9 1996.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:993504-1.
This name was in version 1 of The Plant List, record gcc-33989.