1. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden The Chinese Academy of Sciences Wuhan 430074 China
2. Center of Conservation Biology, Core Botanical Gardens The Chinese Academy of Sciences Wuhan 430074 China
3. University of Chinese Academy of Sciences Beijing 100049 China
4. Sino‐Africa Joint Research Center The Chinese Academy of Sciences Wuhan 430074 China
5. Department of Botany Jomo Kenyatta University of Agriculture and Technology Nairobi 62000‐00200 Kenya
6. Laboratory of Plant Conservation Science, Faculty of Agriculture Meijo University Aichi 468‐8502 Japan