Equisetum hyemale

Equisetum hyemale L., Sp. Pl. 2: 1062 (1753).

its native range is SE. Greenland, Temp. Eurasia. It is has environmental uses and as a medicine.

Vietnamese name:

Cỏ tháp bút, cây mộc tặc, mộc tặc thảo, bút đầu thái.

Uses: 

Treatment of digestive tract diseases, people with hemorrhoids, eye pain, eye pain