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 6C8902DC-DEB3-4D29-A484-76A48AE17EDC) with original publication details: Bull. Torrey Bot. Club 32 611 1905.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23435-2.
This name was in version 1 of The Plant List, record gcc-84470.