The record derives from TICA
(data supplied on )
which reports it as a synonym and as an invalid name (record
91708917-4EB1-4E74-8E8A-63FE8FFCA568) with original publication details: Nomencl. Bot.1: 18. 1821. 18 1821.
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 Ageratum album in version 1 of The Plant List.