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Barringtonia acutangula
Found all over the floor in Danum Valley, Borneo. Smells a little like Jasmine. Our guide said it was "berriconia" but my searches for that, and various other spellings of that sound, have turned up nothing.
The colour of your flower looks more like Barringtonia asiatica but the pendulous habit resembles acutangula .. This is only my suggestion so check both