This name is a synonym of Amphilophium laxiflorum (DC.) L.G.Lohmann.
The record derives from iPlants
(data supplied on 2012-03-23)
which reports it as a synonym (record 317758) with original publication details: Prodr. 9: 195 1845.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:110383-1.
This name was in version 1 of The Plant List, record kew-317758.