This name is a synonym of Symphyotrichum oblongifolium (Nutt.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 53E1A9CC-93C0-4AAD-9217-2FE55656CC6E) with original publication details: Amer. Midl. Naturalist 26 418 1941.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23845-2.
This name was in version 1 of The Plant List, record gcc-25920.