Nawatbhrist Kitudom, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Xishuangbanna, China, Sophie Fauset, University of Leeds, School of Geography, Leeds, United Kingdom, Yingying Zhou, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, China and Hua Lin, Xishuangbanna Tropical Botanical Gardens, Kunming, China