Kostermanthus is a genus of plants in the family Chrysobalanaceae described by British botanist Ghillean Prance in 1979. Species in this genus are large trees native to Malesia.

Description Plants in this genus are large trees with hairless leaves. The inflorescences are unbranched or minimally branched racemes, with hermaphroditic and strongly zygomorphic flowers. The fruits are hard drupes.

Species This genus includes the following species: Kostermanthus heteropetalus Scort. ex King Prance – Peninsular Malaysia, Borneo, Sumatra, Sulawesi, Philippines Kostermanthus malayanus (Kosterm.) Prance – Peninsular Malaysia Kostermanthus robustus Prance – Borneo

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