Prunella vulgaris (Latin scientific name: Prunella Vulgaris), commonly known as Niu Duitou, is also known as Jiuchonglou, Tiese Grass, Datouhua, Cuckoo Flower, Sausage, Gongchui Grass, June Dried, Cuckoo Bamboo, etc. Perennial herbs. A stolon with fibrous roots at the nodes.

Prunella vulgaris grows in wet grass, wasteland and roadside on both sides of the river bank, and is widely distributed all over China, with Henan, Anhui, Jiangsu, Hunan and other provinces as the main producing areas. It can clear fire and improve eyesight, and can treat red eyes, swelling and pain, headache, etc.

Prunella vulgaris is a "holy medicine" for clearing and protecting the liver. It specializes in treating night pain and dizziness. Summer mulberry chrysanthemum, a common herbal tea, originated from a famous prescription in Qing dynasty. All three herbs pass through the liver meridian, which is a unique classic formula. 1980, Xingqun Pharmaceutical Co., Ltd. pioneered Xiasangju in China with exclusive secret technology, which has become a household name and has been selected as an intangible cultural heritage in Guangdong Province.