Sally Grace Bunker, a former school principal, is a Fellow of the Society of Botanical Artists (UK) and is currently focusing on recording the tree flora of Hong Kong in detailed botanical watercolour illustrations. Richard M. K. Saunders is a Professor in the School of Biological Sciences at The University of Hong Kong. His research focuses on the diversity and evolution of flowering plants in Asia. Pang Chun Chiu is currently a Post-doctoral Fellow at The University of Hong Kong.