This name is a synonym of Symphyotrichum tradescantii (L.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 12F81E55-080E-45BC-9085-A51FE329B96A) with original publication details: 21 1818.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:180758-1.
This name was in version 1 of The Plant List, record gcc-105215.