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 385F667D-BE84-477F-8C93-FF71F0E79532) with original publication details: Syn. Fl. N. Amer. 1(2) 191 1884.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:304959-2.
This name was in version 1 of The Plant List, record gcc-72624, and has not been changed.