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 2F2569B3-B0A2-4192-8A51-A3EF30119F83) with original publication details: Amer. Midl. Naturalist 2 146 1911.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23652-2.
This name was in version 1 of The Plant List, record gcc-104653.