1. CAS Key Laboratory for Plant Biodiversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, People's Republic of China
2. University of Chinese Academy of Sciences, Beijing 10049, People's Republic of China
3. College of Forestry, Southwest Forestry University, Kunming, Yunnan 650224, People's Republic of China