Mastixia glauca is a tree in the family Nyssaceae. The specific epithet is from the Greek meaning "bluish-grey", referring to the colour of the leaf underside.
Description Mastixia glauca grows as a tree measuring up to tall with a trunk diameter of up to . The pale green fruits are oblong-ovoid and measure up to long.
Distribution and habitat Mastixia glauca is endemic to Borneo and confined to Malaysia's Sarawak state where it is known only from Mount Santubong. Its habitat is mixed dipterocarp forests at around altitude.
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