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Koa Fabaceae Endemic to the Hawaiian Islands Hālawa Valley, Oʻahu  Early Hawaiians: Medicinally, koa leaves were placed under a pile of lau hala mats if a person had been in a sick bed for a long time. Leaves were placed on top and spread evenly over the mat to make to person comfortable.The heat that came from the body and the leaves would make the person sweat.   More uses can be found at...  NPH00012 nativeplants.hawaii.edu/plant/view/Acacia_koa