Kostermanthus heteropetalus is a tree in the family Chrysobalanaceae. The specific epithet is from the Greek meaning 'uneven or unequal petals'.
Description Kostermanthus heteropetalus grows up to tall with a trunk diameter of up to . The fissured bark is grey-brown. The flowers are pink, tinged white. The ovoid fruits measure up to long.
Distribution and habitat Kostermanthus heteropetalus grows naturally in Sumatra, Peninsular Malaysia, Borneo, the Philippines and Sulawesi. Its habitat is mixed dipterocarp forests from sea-level to elevation.
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