Mastixia eugenioides is a tree in the family Nyssaceae. The specific epithet is from the Latin and refers to the resemblance of the leaves to those of the genus Eugenia.
Description Mastixia eugenioides grows as a tree measuring up to tall with a trunk diameter of up to . The smooth bark is greyish to yellowish brown. The ovoid to oblong fruits are green, ripening purple, and measure up to long.
Distribution and habitat Mastixia eugenioides is endemic to Borneo. Its habitat is mixed dipterocarp forests from sea-level to altitude.
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