1. School of Life Sciences, East China Normal University, Shanghai 200241, P.R. China
2. School of Biological Sciences, the University of Hong Kong, Hong Kong, P.R. China
3. Shanghai Chenshan Botanical Garden, Shanghai 201602, P.R. China
4. Division of Forest Biology, Taiwan Forestry Research Institute, Taipei 100, Taiwan
5. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, P.R. China