This name is a synonym of Ageratina deltoidea (Jacq.) R.M.King & H.Rob..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 4C31CBAA-83F9-4056-B809-7B1F7631FE02) with original publication details: 164 1836.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:206140-1.
This name was in version 1 of The Plant List, record gcc-86533.