1. Research and Collections Center; Illinois State Museum; 1011 East Ash Street Springfield IL 62703 USA
2. School of Geography; University of Nottingham; Nottingham UK
3. Flora Conservation Department; Kadoorie Farm & Botanic Garden; Lam Kam Road Tai Po New Territories Hong Kong
4. Department of Renewable Resources; University of Alberta; Edmonton Alberta T6G 2H1 Canada
5. Nanjing Institute of Environmental Sciences; Ministry of Environmental Protection; 8 Jiangwangmiao Street Nanjing 210042 China