This name is a synonym of Symphyotrichum falcatum var. commutatum (Torr. & A.Gray) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 18A581A9-400F-4EE1-BAAF-4CF957382E2D) with original publication details: Rhodora 80 340 1978.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23420-2.
This name was in version 1 of The Plant List, record gcc-41565.