Lehua mamo or 'ohi'a (Metrosideros macropus), is a species of tree in the eucalyptus family, Myrtaceae. It is endemic to the island of Oʻahu in the Hawaiian Islands. It is closely related to the widespread and highly variable ʻōhiʻa lehua (M. polymorpha), found throughout the islands. Lehua mamo, however, is only found in the Koʻolau mountains. It is distinguished from M. polymorpha by the elongate leaf petioles (1/3-1/2 as long as the leaf blades, compared to less than 1/4 as long in M.