Money maples, alias double whorl, is a plant of the genus Acer in the Aceraceae family. It grows on the edge of the forest or in the sparse forest at an altitude of 1000 to 2000 meters, and can be as high as 15 meters. It is endemic to China. Its leaves are opposite, odd-pinnate compound leaves; early summer white flowers, monoecious, panicles; fruit divided into two nutlets, each with wide wings, shaped like money. Due to the deforestation of trees, the adult plants of Acer mongolica are extremely rare, coupled with the weak ability of natural regeneration, it is difficult to grow young trees, which need to be protected like giant pandas.
The most appropriate summary of the main idea of the passage is that there is an urgent need to strengthen the protection of money maple.