This name is a synonym of Symphyotrichum fontinale (Alexander) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 2582C5AC-736F-4E2E-9CBD-B97E1083FD58) with original publication details: Rhodora 72 40 1970.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23901-2.
This name was in version 1 of The Plant List, record gcc-63793, and has not been changed.