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Brown, "winged" seed structure ~ 3 inches long and ½ wide.
Tropical insular coastal valley.
Spotted in mid-air above Waimea Falls at Waimea Falls Park, along with two others, "helicoptering" down in a manner evocative of maple seeds, from a steep hillside north of Waimea Falls. The seeds landed near a public area at the falls, so I went looking and found one,which I then imaged.
jdc14515 - Thanks for the suggestion. I agree that this spotting is a mahogany tree seed, however, in addition to Swietenia sp. tree, it could as well be from a Toona sp. tree, one of the Asian mahogany species. Individuals of both genera are present in Hawaii. I've edited the spotting to reflect this update.