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 58F133E2-6F7A-45A2-8AC9-96DE0DF0DCCE) with original publication details: Amer. Midl. Naturalist 2 148 1911.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23355-2.
This name was in version 1 of The Plant List, record gcc-98788.