This name is a synonym of Ethulia conyzoides L.f..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 456B5CBB-74F1-438E-A859-7EEE43477030).
This name record (from TICA) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Ethulia conyzoides in version 1 of The Plant List.