Trees. Up to 18m; down broad oval crown. Branchlets slender drooping. Leaves narrowly lanceolate to linear-lanceolate, long 8 ~ 16cm, amidst growing tip pointed, margin serrulate, green surface, the back of the blue-gray-green; petiole about 1cm; stipule expansion of sickle-shaped, early fall. Male flowers with 2 stamens, 2 glands; belly mask only 1 female ovary glands. Flowering from March to April; fruit ripening 4 to 5 months. 
 Mainly around the south of the Yangtze River and its plains, north, northeast are also cultivated. Vertical distribution at an altitude of 1300m below the water's edge is plain common tree 
 The city's green seedlings in full swing, the rapid urban construction, our living environment is improving. Good moral character, elegant and civilized behavior, and harmonious environmental awareness is an essential quality of modern humans, damage to living environment is tantamount to self-mutilation. We should have a high sense of responsibility to care for beautiful, selfless love to serve our community better do something, take concrete actions to maintain the lofty social civilization. The main provider of green trees are: Sophora japonica, elm, poplar, willow, etc. Let the same with the United States in it, I firmly believe that the power of solidarity is great. 

 http://miaomu88.51eim.com