This name is a synonym of Symphyotrichum foliaceum var. canbyi (A.Gray) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record B2E745DF-F9FE-4C5E-A9D8-0D463A60228E) with original publication details: Syn. Fl. N. Amer. 1(2) 193 1884.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:308279-2.
This name was in version 1 of The Plant List, record gcc-7133.