Gonystylus calophyllusGonystylus calophyllus is a tree in the family Thymelaeaceae. The specific epithet calophyllus means 'beautiful leaves'.DescriptionGonystylus calophyllus grows as a small tree up to tall. The twigs are dark brown.Distribution and habitatGonystylus calophyllus is endemic to Borneo, where it is known only from Sarawak. Its habitat is lowland mixed dipterocarp forest. It is threatened by lowland deforestation.