This name is a synonym of Alternanthera crassifolia (Standl.) Alain.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Proc. Biol. Soc. Wash. 32: 241 1919.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:2480-2.
This name was in version 1 of The Plant List, record kew-2617546, and has not been changed.