Photo taken on May 24, 2015 shows wild azalea in Danba County, southwest China's Sichuan Province. A scientific investigation on wild azalea in the Hengduan Mountains concluded on Tuesday, in which researchers has found, recognized and taken photos of 15 kinds of wild azalea in four days on an altitude of 2,000 to 4,000 meters on Hengduan Mountains of Sichuan Province. (Photo: Xinhua/Wei Rongping)