This name is a synonym of Symphyotrichum oblongifolium (Nutt.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record A817B2B6-48D8-45BE-85BA-B55879E7E8A8) with original publication details: Prodr. 5: 237 (1836) 237 1836.
This name was in version 1 of The Plant List, record gcc-112401.