Glyptostrobus pensilis is one of the state key protected wild plants listed in Class I, mainly distributed in South and Southeast China, and also found in Vietnam and Laos. It was very common in the Pearl River Delta Region previously but decreased quickly in the past 50 years because of serious disturbance from dramatic human activities, rapid habitat loss and its own physiological defects. It has been now evaluated as Critically Endangered category according to IUCN criteria. Our field investigation to th...