This name is a synonym of Amphilophium crucigerum (L.) L.G.Lohmann.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50006042) with original publication details: Ann. Missouri Bot. Gard. 66: 784 1979.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:110381-1.
This name was in version 1 of The Plant List, record tro-50006042.