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 F2597AFB-7CB8-48F8-A9E6-49AEA41B99E0) with original publication details: Hort. Kew. 3: 205 (1789) 205 1789.
This name was in version 1 of The Plant List, record gcc-39711.