This name is a synonym of Symphyotrichum lanceolatum var. hesperium (A.Gray) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 8FE0F072-0E9E-425B-B33F-469A5EB26ED4) with original publication details: Rhodora 35 28 1933.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23231-2.
This name was in version 1 of The Plant List, record gcc-38063.