The color of Davidia involucrata flowers changes from early flowering to withering. The involucre is light green at first, then milky white, and finally brown and yellow. Davidia involucrata, which opened for the second time, is known as "a wonderful tree" and is mainly distributed in Hubei, Hunan, Sichuan, Guizhou, Yunnan, Gansu and other regions. It belongs to/kloc-tertiary paleotropics more than 0/0 million years ago. The remaining plants, which survived the Quaternary ice age catastrophe, have the reputation of "plant giant panda" and are national first-class protected wild plants.