This name is a synonym of Alternanthera pungens Kunth.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 1101342) with original publication details: Syst. Veg. 1: 820 1824.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:434930-1.
This name was in version 1 of The Plant List, record tro-1101342.