Metrosideros macropus, the lehua mamo or 'ohi'a, is a species of tree in the eucalyptus family, Myrtaceae.

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. polymorpha) and the flowers are usually yellow.

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