This name is a synonym of Alternanthera ramosissima (Mart.) Chodat & Hassl..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 1100526) with original publication details: Nov. Gen. Sp. Pl. 2: 34 1826.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:60932-1.
This name was in version 1 of The Plant List, record tro-1100526.