This name is a synonym of Symphyotrichum × finkii (Rydb.) G.L.Nesom.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50069579) with original publication details: Brittonia 1(2): 102 1931.
This name record (from Tropicos) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Aster finkii in version 1 of The Plant List.