This name is a synonym of Erigeron elmeri (Greene) Greene.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 1F64D061-A1B0-4545-B7DF-985C23FA577B) with original publication details: Pittonia 2 170 1891.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23365-2.
This name was in version 1 of The Plant List, record gcc-99435, and has not been changed.