This name is a synonym of Alternanthera littoralis var. sparmannii (Moq.) Pedersen.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Bull. Jard. Bot. État 18: 115 1946.
This name was in version 1 of The Plant List, record kew-2631271.