Mastixia trichotoma is a tree in the family Nyssaceae. The specific epithet trichotoma is from the Greek meaning “three parts”, referring to the three-branched inflorescence.

Mastixia trichotoma grows as a tree measuring up to 40 metres (130 ft) tall with a trunk diameter of up to 50 centimetres (20 in). The smooth to fissured bark is yellowish grey to grey-brown. The flowers are green to yellowish green. The ovoid to ellipsoid fruits measure up to 3 cm (1 in) long.

Distribution and habitat
Mastixia trichotoma grows naturally in the Andaman and Nicobar Islands, Thailand, Sumatra, Peninsular Malaysia, Java, Borneo, Sulawesi, the Moluccas and Mindanao. Its habitat is mixed dipterocarp forests from sea-level to 1,800 metres (6,000 ft) altitude.