Timothy M. A. Utteridge is a botanist in the Asia Team at the Royal Botanic Gardens, Kew. His research focuses on the taxonomy and systematics of various woody plant groups in South-East Asia, especially members of the tropical Primulaceae, and on the floristics and conservation of New Guinea and Borneo. He is the Editor-in-Chief of Kew Bulletin and co-author of The Kew Tropical Plant Families Identification Handbook and A Guide to the Alpine and Subalpine Flora of Mount Jaya. Laura V. S. Jennings is a botanist in the Asia Team at the Royal Botanic Gardens, Kew. Her research is focussed geographically on the Lesser Sunda Islands and New Guinea, and covers the taxonomy of Malvaceae-Grewioideae, analysis of ecological traits and floristics.