Koa is one of the forest's most prized gems. Koa is a fast growing tree native to Hawaii and because of over-harvesting, now comes largely from dead or dying trees on private land. The tree ordinarily grows to 50 feet tall but larger specimens have been found. The veneer is often known for the curly figure which is present in much of the koa that is harvested today. Wikipedia has a great article where you can learn more about the koa tree.