This name is a synonym of Ludwigia longifolia (DC.) H.Hara.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Descr. Fis. Econ. Parag. 13 1910.
This name was in version 1 of The Plant List, record kew-2333186, and has not been changed.