Mount Tai lies in the zone of oriental deciduous forest; about 80% of its area is covered with vegetation. The flora is known to comprise almost 1,000 species. Some of the trees in the area are very old and have cultural significance, such as the Han Dynasty Cypresses, which were planted by the Emperor Wu Di, the Tang Chinese Scholartree (about 1,300 years old), the Welcoming-Guest Pine (500 years old) and the Fifth-Rank Pine, which was named originally by the Emperor Qin Shi Huang, but was replanted about 250 years ago.