This name is a synonym of Symphyotrichum ericoides var. pansum (S.F.Blake) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 09946BA3-7692-4148-9EF5-8E49EA91C104) with original publication details: Naturaliste Canad. 89 70 1962.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23389-2.
This name was in version 1 of The Plant List, record gcc-58389, and has not been changed.