The type of area Wiliwili are typically found in have a dominant tree species of Acacia koa. They are of the pea family.
 Dominant tree species include koa ("Acacia koa"), koai a ("A. koaia"),  akoko ("Euphorbia" spp.) 
Acacia koa is a species of flowering tree in the pea family, Fabaceae. 
 It is typically found in Hawaiian tropical dry forests on leeward island slopes up to an elevation of 600 m . 
