This name is a synonym of Symphyotrichum × columbianum (Piper) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record CE3D843D-D4FB-4DE3-A0F3-380F8A6C052E) with original publication details: Rhodora 30 227 1928.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23790-2.
This name was in version 1 of The Plant List, record gcc-30300.