This name is a synonym of Symphyotrichum lentum (Greene) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 8B949333-DAC2-4F83-98E5-2F0E6A6CBA33) with original publication details: 566 1901.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23200-2.
This name was in version 1 of The Plant List, record gcc-25490, and has not been changed.