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Peristrophe sp.
Peristrophe cf. roxburghiana
Growing along a path in coastal mixed lowland equatorial rainforest (freshwater swamp forest/sago swamp).
(Location map marker is approximate)
Thanks Jonathan for the ID suggestion. Did you also have a good informational link on the species? Perhaps I didn't look long enough but I could not find the species mentioned for New Guinea. But there are records for the genus.( http://www.pngplants.org/cgi-bin/RBG ) I don't know if it is invasive or another member of the genus.