This name is a synonym of Symphyotrichum novi-belgii (L.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record E9BF26C2-96BF-43A3-9E3F-9423CF370FA2) with original publication details: Fl. Montaub. 147 1789.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:176157-1.
This name was in version 1 of The Plant List, record gcc-97552.