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 B3DA5DA2-74F6-4B2D-81CF-69671BEBF134) with original publication details: Bull. Torrey Bot. Club 31 654 1904.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:181910-1.
This name was in version 1 of The Plant List, record gcc-78550.