This name is a synonym of Erigeron robustior (Cronquist) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 724C65B0-4C32-4EAB-93A4-6A4A641A62A4) with original publication details: Brittonia 6 174 1947.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:93701-2.
This name was in version 1 of The Plant List, record gcc-53972, and has not been changed.