This name is a synonym of Symphyotrichum molle (Rydb.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 91A4969F-D17B-4529-B0E1-4CC2C4F7F0B7) with original publication details: Bull. Torrey Bot. Club 28 22 1901.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23775-2.
This name was in version 1 of The Plant List, record gcc-41453, and has not been changed.