This name is a synonym of Symphyotrichum praealtum (Poir.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 906F9144-92D8-40DB-B460-9F4A71C53DB3) with original publication details: Rhodora 51 96 1949.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23229-2.
This name was in version 1 of The Plant List, record gcc-60569.