This name is a synonym of Symphyotrichum lateriflorum var. spatelliforme G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record F07F9DD1-8EDC-4820-8CCA-477D19C5CED9) with original publication details: Phytologia 55 379 1984.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23642-2.
This name was in version 1 of The Plant List, record gcc-38526, and has not been changed.