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 B7D8B5A7-1944-484E-AB35-F5A1E034870C) with original publication details: Amer. Midl. Naturalist 29 462 1943.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23198-2.
This name was in version 1 of The Plant List, record gcc-71365, and has not been changed.