Pentachlaena betamponensis is a tree in the family Sarcolaenaceae. It is endemic to Madagascar. It is named for the Betampona Reserve where the species is found.
Description Pentachlaena betamponensis grows as a tree of unknown height. Its coriaceous leaves are obovate in shape and coloured brown above and greenish brown below. They measure up to long. The inflorescences bear up to 10 flowers, each with five sepals and five petals. Fruits are unknown.
Distribution and habitat Pentachlaena betamponensis is known only from the eastern region of Atsinanana, where it confined to the Betampona Reserve. Its habitat is humid forest from altitude.
Conservation Pentachlaena betamponensis has been assessed as critically endangered on the IUCN Red List. It has only one known subpopulation. The species is threatened by logging and cyclones.
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