This name is a synonym of Alternanthera dominii Schinz.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 1100311) with original publication details: Prodr. 13(2): 374 1849.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:61506-1.
This name was in version 1 of The Plant List, record tro-1100311, and has not been changed.