This name is a synonym of Symphyotrichum novi-belgii (L.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 598C1DEA-35A7-4DEF-B5D8-DB7D1F6BD547) with original publication details: Naturaliste Canad. 69 116 1942.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:24261-2.
This name was in version 1 of The Plant List, record gcc-129090.