This name is a synonym of Alternanthera aquatica (Parodi) Chodat.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: J. Wash. Acad. Sci. 5: 74 1915.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:2494-2.
This name was in version 1 of The Plant List, record kew-2617593, and has not been changed.