1. Shenzhen Key Laboratory of Southern Subtropical Plant Diversity; Fairylake Botanical Garden; Shenzhen and Chinese Academy of Sciences; Shenzhen 518004 China
2. Sino-Africa Joint Research Center; Chinese Academy of Sciences; Wuhan 430074 China
3. National Museum of Kenya; Nairobi; Kenya
4. Shanghai Chenshan Botanical Garden; Shanghai Chenshan Plant Science Research Center; Chinese Academy of Sciences; Shanghai 201602 China
5. Royal Botanic Gardens; Kew; Richmond, TW8 3DS UK
6. Department of Plant Systematics; University of Bayreuth; Germany
7. School of Life Sciences; Sun Yat-Sen University; Guangzhou 510265 China
8. Department of Life Sciences; Natural History Museum; London SW7 5BD UK