Richetia collaris is a tree in the family Dipterocarpaceae, native to Borneo. The specific epithet collaris means 'neck' and refers to the calyx of the fruit.
Richetia collaris grows up to 50m (160feet) tall, with a trunk diameter of up to 1.50NaN0. It has buttresses measuring up to 20NaN0 tall. The cracked bark is yellow to brown. The papery leaves are oblong to lanceolate and measure up to 23cm (09inches) long. The inflorescences measure up to 9cm (04inches) long and bear up to eight flowers. The nuts are egg-shaped and measure up to 3cm (01inches) long.
Richetia collaris is endemic to central Sarawak on Borneo. Its habitat is mixed dipterocarp forests up to 1000m (3,000feet) elevation.
Richetia collaris has been assessed as vulnerable on the IUCN Red List. It is threatened by logging, including for its timber. It is also threatened by expansion of land for plantations, including for palm oil and other tree species. The species is not found in any protected areas.