This name is a synonym of Alternanthera hirtula (Mart.) R.E.Fr..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Bonplandia (Corrientes) 10: 84 2000.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1018601-1.
This name was in version 1 of The Plant List, record kew-2631228, and has not been changed.