Kopsia dasyrachis grows as a tree up to 10 metres (30 ft) tall, with a trunk diameter of up to 15 centimetres (6 in). The bark is grey or yellow. Its flowers feature a white corolla. The tree is found in lowland forests from sea-level to 900 metres (3,000 ft) altitude. K. dasyrachis is endemic to Borneo and known only from Sabah.