Photo taken on May 12, 2014 shows alsophila spinulosa, also known as tree ferns, in Medog County of Nyingchi Prefecture, southwest China's Tibet Autonomous Region. The warm current from the Indian Ocean and its special geographical condition make Medog a natural botany museum, where almost all varieties of trees living from tropical to frigid zones in the Northern Hemisphere can be found. (Xinhua/Purbu Zhaxi)
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