This name is a synonym of Symphyotrichum oblongifolium (Nutt.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record C3FC056A-AF3D-41EC-9FBE-5A49B3CC76BE) with original publication details: Castanea 10 72 1945.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23846-2.
This name was in version 1 of The Plant List, record gcc-48736.