People wander through bougainvillea flowers in full blossom at the National Bougainvillea Germplasm Resource Repository of the Xiamen Botanical Garden in Xiamen city, southeast China's Fujian Province. (People's Daily Online/Chen Bo)

Photo shows blooming bougainvillea flowers at the National Bougainvillea Germplasm Resource Repository of the Xiamen Botanical Garden in Xiamen city, southeast China's Fujian Province. (People's Daily Online/Chen Bo)

Photo shows blooming bougainvillea flowers at the National Bougainvillea Germplasm Resource Repository of the Xiamen Botanical Garden in Xiamen city, southeast China's Fujian Province. (People's Daily Online/Chen Bo)

Photo shows blooming bougainvillea flowers at the National Bougainvillea Germplasm Resource Repository of the Xiamen Botanical Garden in Xiamen city, southeast China's Fujian Province. (People's Daily Online/Chen Bo)

A butterfly sucks nectar from a bougainvillea flower at the National Bougainvillea Germplasm Resource Repository of the Xiamen Botanical Garden in Xiamen city, southeast China's Fujian Province. (People's Daily Online/Chen Bo)