This name is a synonym of Symphyotrichum oolentangiense (Riddell) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 540AD9C7-141A-43B9-8AA6-7661604718CE).
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 azureus in version 1 of The Plant List.