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 50E7CE45-6DB7-41E7-B8CA-37A14224E08A) with original publication details: Rhodora 73 303 1971.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23844-2.
This name was in version 1 of The Plant List, record gcc-74216.