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 73A43E97-34A0-4D94-A581-7123F173F354) with original publication details: 649 1981.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:909825-1.
This name was in version 1 of The Plant List, record gcc-82042, and has not been changed.