This name is a synonym of Symphyotrichum hallii (A.Gray) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 9191F71A-2582-43F1-912A-8B0CAE7B5724) with original publication details: 1884.
This name was in version 1 of The Plant List, record gcc-93596, and has not been changed.