This name is a synonym of Symphyotrichum spathulatum var. yosemitanum (A.Gray) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record B8D7E00A-7933-4E2E-9412-A980AAEF97D4) with original publication details: Contr. U. S. Natl. Herb. 16 210 1913.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23880-2.
This name was in version 1 of The Plant List, record gcc-107179, and has not been changed.