This name is a synonym of Symphyotrichum pilosum var. pringlei (A.Gray) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 9483141B-83E6-400D-BB93-EC60F0FB9C98) with original publication details: 29 1818.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:182007-1.
This name was in version 1 of The Plant List, record gcc-136511.