This name is a synonym of Symphyotrichum cusickii (A.Gray) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record A6DED6C2-D772-4F9E-B8A8-4BBAFEDA7E09).
This name record (from TICA) 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 cusickii in version 1 of The Plant List.