Name This Tree

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This tree is widely planted in U.S. cities due to its hardiness and fall foliage, but is native to China. It can reach a height of over 50 ft. and is a living fossil with some specimens more than 2,500 years old. It is extremely resistant to disease and insects. This tree is dioecious and fertilization occurs similar to ferns, mosses, and algae. The tree has been used for medicinal purposes, particularly as a dietary supplement to enhance cognitive functions, to treat Alzheimer’s disease, and to treat high blood pressure. What is this tree?