This name is a synonym of Symphyotrichum patens (Aiton) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 78D204D5-8A33-4160-B76E-96AB959652A1) with original publication details: 201 1789.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23900-2.
This name was in version 1 of The Plant List, record gcc-98693.