Polynesians used the seed within the nut/fruit of this tree in an variety of ways. A few of the most notable ones are:
- Used the oil from the seeds to protect from sun, wind, and saltwater (as a sunscreen or varnish)
- Chewed them up and spat it out onto water while fishing (to help with visibility)
- Roasted and ground them to produce a delicious flavoring for Poke
- Strung nuts/seeds together to make garlands
However, I will relate its primary use through an old Hawaiian saying:
“Ua lilo i ke koli kukui a maluhi”
Which means, more or less, “Gone lamp-trimming until tired.” It was used to describe someone who’s been out all night.
Because of the high oil content of the seed, Hawaiians would use it as a source of light. One method was to skewer a bunch of them together on slivers of bamboo or palm midribs and burn them. As each seed would burn out, it was removed while the next burned, thus the saying above. Additionally, if the all seeds strung together were of a uniform size, keeping track of how many seeds had burned would provide a relatively consistent measure of time.
This plant is a tree that can grow up to 90 ft tall. The leaves are usually about 8 inches long and are either oval or tri-tipped. The lower epidermis is coated with a silvery substance that gives the tree its pale green appearance. The nuts are 1.5-2.5” in diameter. Young nuts are green and have a leathery texture, while the mature nuts are brown and dried. The seeds within the nut are white when immature, and black when mature. The seeds are 1-1.5" in diameter. The blossoms are small and white.
And the nuts were not the only useful part of this plant; polynesians utilized its wood and leaves as well. Uses ranged from medicine to fishnet floats.
That should be much more info than needed

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Tree:
Leaves, Flowers, Nut/Fruit:
Nuts/Fruits:
Mature Seeds:
Flowers:
ETA: Big hint, in Hawaiian, the name of this plant means "light"
