Castanopsis foxworthyi is a tree in the family Fagaceae. It is named for the botanist Frederick William Foxworthy.
Description Castanopsis foxworthyi grows as a tree up to tall with a trunk diameter of up to . The smooth bark is blackish brown. The coriaceous leaves measure up to long. Its ovoid nuts measure up to long.
Distribution and habitat Castanopsis foxworthyi grows naturally in Peninsular Malaysia and Borneo. Its habitat is dipterocarp, peat swamp and kerangas forests from sea-level to elevation.
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