From the Wikipedia page [1]

Osmanthus fragrans (Sweet Osmanthus; Chinese: 桂花 guìhuā; Japanese: 金木犀 kinmokusei; also known as Sweet Olive, Tea Olive and Fragrant Olive) is a species of Osmanthus native to Asia, from the Himalaya east through southern China (Guizhou, Sichuan, Yunnan) and to Taiwan and to southern Japan. Sweet osmanthus is also the 'city flower' of Hangzhou, China.

In Chinese, the plant is called xī (樨) or guìhuā (桂花), and its flowers, called guì huā (桂花, literally "cinnamon flower" or "cassia flower") are used, infused with green or black tea leaves, to create a scented tea called guì huā chá (桂花茶).

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