This name is a synonym of Conyza maxima Zoll. & Mor..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 305B47B7-9B20-46C5-B7D8-F0E80EC499DB) with original publication details: 248 1900.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:185628-1.
This name was in version 1 of The Plant List, record gcc-138583, and has not been changed.