京郊门头沟区全区面积１４５５平方公里，其中山地占全区面积的９８．５％。广阔的山山岭岭，遍布着无患子科落叶乔木栾树。栾树又名灯笼树，摇钱树。要说栾树当地人知者甚少，当地人称木兰树。为什么叫木兰树呢？当地流传着一个民间故事。据传昔日花木兰替父从军，带兵作战， Mentougou District of Beijing covers an area of ​​1455 square kilometers, of which 98.5% of the total area of ​​the mountain. The vast mountain ridge, covered with Sapindaceae deciduous trees Golden Luan trees. Luan tree, also known as lanterns tree, money tree. Luan tree to say that there are very few locals, locals call Magnolia tree. Why Magnolia tree? There is a folk story circulating in the area. It is said that in the past, Mulan replaced his father from army and sent troops to fight.