Reading this: Barrett, Russell L. (2006 April 28) A review of _Planchonia_ (Lecythidaceae) in Australia. Australian Systematic Botany 19 (2) : 147–153 . → https://doi.org/10.1071/SB05008
Including considering different genera in this botanical family Lecythidaceae and three spp. in this genus _Planchonia_, including the New Guinea known species _Planchonia papuana_ which this article's introduction says has green petals like these photographs, rather than white petals in _Planchonia careya_ and _Planchonia rupestris_ . .
Confirmation of this identification, for me, comes with this section of the article linked above: – quotation: " Both Australian species have obscurely ciliate calyx lobes, entire in all other species. _P. papuana_ Kunth. is probably the most closely related species, clearly distinguished by the buttressed trunks, much larger leaves (to 19 × 8 cm) with prominent midribs below; green (v. white) petals, and long staminal tube 10–15mm (v. 4–11 mm) long. " .
Furthermore not a species of the genus _Barringtonia_ .
Note: • We can see the cilia along the margins of the calyx lobes in looking closely at this sighting's photographs in their full resolution . • The outer sides of the petals of all three species may have green or green-ish colour; yet the Au _Planchonia careya_ and _Planchonia rupestris_ have white insides of the petals. (In these three photographs we don't see the insides of the petals).