This name is a synonym of Symphyotrichum grandiflorum (L.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record CB81E0AE-6E65-4E81-9FF2-8430BF642A28) with original publication details: 1022 1980.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:135661-2.
This name was in version 1 of The Plant List, record gcc-90507, and has not been changed.