1. Key Laboratory of Three Gorges Regional Plant Genetics & Germplasm Enhancement (CTGU)/Biotechnology Research Center China Three Gorges University Yichang 443002 Hubei China
2. Department of Botany, National Museum of Natural History Smithsonian Institution PO Box 37012 Washington DC 20013‐7012 USA
3. State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany Chinese Academy of Sciences Beijing 100093 China
4. Key Laboratory of Plant Resources Conservation and Utilization, College of Biology and Environmental Sciences Jishou University Jishou 416000 Hunan China
5. Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 China
6. Magnolia Society International, Magnolian Grove Arboretum 651 Newton Road Pickens SC 29671 USA