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 A0E8C83E-539C-41A0-A16B-D72E57E62633) with original publication details: Rhodora 16 59 1914.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:308460-2.
This name was in version 1 of The Plant List, record gcc-127246.