Family: Equisetaceae

English name: Horse Tail.

Description of the plant:
Stem scrambling, from a perennial creeping rootstock, often attaining 3 m among bushes. Branches long, slender, few, often only 2-3 in a whorl. Internodes 3.8-10 cm long. Leaf teeth 1.75-3 mm long, subulate-acuminate, black. Cone 8-18 mm long.

Using information:
The plant is administered as a cooling medicine; given for the treatment of gonorrhoea and bone fracture (Yusuf et al. 2009).

Chemical constituents:
Various species of Equisetum contain flavonoids, glycoside, sterols, phenolic acids, large amounts of silicic acid and silicates. They also contain lipids containing triacontanedioic (equisetolic) and octacosanedioic acids, rhodoxanthin, silicon compounds and polyphenols, polyphenolic acids including caffeic and protocatechuic acids. Equisetum debile also contains alkaloids including nicotine. Silicon-containing compounds have been extracted from this plant for medical application (Ghani, 2003).

Chittagong and Jessore, mostly in shady hills and stream banks.