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 919288E0-DD0A-41E4-9932-E1C04E7706F2) with original publication details: Leafl. W. Bot. 6 44 1950.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23543-2.
This name was in version 1 of The Plant List, record gcc-68827.