2. Onion: Alias onion, onion, jade onion, onion, Dutch onion, bark tooth, etc. , a biennial herb of Amaryllidaceae and Allium;
3. Onions are widely distributed in China, and cultivated in both north and south. They are one of the main vegetables cultivated in China.
4. Onion producing areas in China mainly include Fujian, Shandong, Gansu, Inner Mongolia, Xinjiang and other places;
5. Onion is a biennial or perennial herb;
6. String-shaped, dark green cylindrical hollow leaves with waxy surface;
7. The leaf sheaths are thick and scaly, and form bulbs around the shortened stems;
8. Umbrella, small white flowers;
9. The rhizome is covered with a thin layer of skin, usually white or light yellow.