This name is a synonym of Porophyllum ruderale (Jacq.) Cass..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 8FC47EE0-DFB3-480F-91A9-E7BEA2FA39B9) with original publication details: 1738 1804.
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 Kleinia porophyllum in version 1 of The Plant List.