This name is a synonym of Alternanthera hirtula (Mart.) R.E.Fr..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Bull. Soc. Bot. Genève II, 18: 277 1927.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:10369-2.
This name was in version 1 of The Plant List, record kew-2631231, and has not been changed.