This name is a synonym of Symphyotrichum martii (Baker) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 14823CAF-7A41-45E2-AFE1-C7265C50D597) with original publication details: Fl. Bras. (Martius) 6(3) 23 1882.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:305862-2.
This name was in version 1 of The Plant List, record gcc-120291, and has not been changed.