This name is a synonym of Symphyotrichum defoliatum (Parish) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 8E0406AD-1E56-496D-A614-27CD2C0B6481) with original publication details: Contr. Gray Herb. 56: 36 36 1918.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23307-2.
This name was in version 1 of The Plant List, record gcc-21529, and has not been changed.