The ouput of a collaborative research project between the Forest Research Institute Malaysia (FRIM), the Forestry Department of Sabah and the Forest Department of Sarawak. The project aims to provide detailed and up-to-date botanical and ecological information on the tree resources of Sabah and Sarawak and is an important reference for foresters, botanists and all those involved in the timber and wood-based industries. The Project also aims to develop plant taxonomists through the provision of training at all levels to staff assigned to assist in the preparation of manuscripts on the different tree families.