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 C143E0B7-EF41-4060-9861-B72AB73F1E90) with original publication details: Naturaliste Canad. 89 67 1962.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23384-2.
This name was in version 1 of The Plant List, record gcc-63479.