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 B2FDA7BB-ACA6-475C-9E4B-547509CEDC7A) with original publication details: Ill. Fl. N. U.S. 3 375 1898.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23805-2.
This name was in version 1 of The Plant List, record gcc-45564.