This name is a synonym of Alternanthera spinosa (Hornem.) Schult..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym and as an invalid name with original publication details: Syn. Pl. 1: 866 1839.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:59124-1.
This name was in version 1 of The Plant List, record kew-2631084, and has not been changed.