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 B8C1408D-1A03-4EA7-A9E0-22EEFA6F434B) with original publication details: Bull. Torrey Bot. Club 37 145 1910.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23928-2.
This name was in version 1 of The Plant List, record gcc-18926.