This beauty is a Nutmeg Flower. There are many different varieties of nutmeg. This one hails from Jamacia. The nuts and seed hulls from this plant can be ground and used as a spice, though according to internet sources, it is inferior to the Spice Islands nutmeg.
There were few flowers on the tree, but plenty of black, withered leaves. Further inspection revealed that the black “leaves” didn’t resemble the green leaves. that’s when it dawned on me that the tree was covered in dead flowers! Inside that withered black shell, a nutmeg fruit is forming. Maybe when Jientje is here, we can go back to the garden and there will be fruit on the tree.
UPDATE: My Amoeba looked at this post and told me there likely won’t be any fruit on the tree when Jientje gets here. He says the flowers are all black and dried up because they were never pollinated. This tree is pollinated by a specific beetle, and that beetle doesn’t live in Hawaii.