Perennial with thick woody root; straight stem up to 1 m high, dressed with 3 leaves in a whorl or opposite; leaves sessile, pointed; flowers at the top, stem and branches are collected in whorls, forming dense intermittent brushes; corollas raspberry, medium-sized, from 6-10 petals; the fruit is a box. Blooms in July-August.
It grows in damp places, along the banks of reservoirs. Occurs quite often.
The roots contain tannins; in seeds alkaloid glycoside, lytrarin; in the grass – glycoside salikarin, traces of essential oil, resin; in flowers – flavones.
The medicinal raw material is the root, in its absence – the grass.
An aqueous decoction is drunk for stomach pains, female diseases, uterine bleeding, as a diuretic, for diseases caused by weight lifting, venereal diseases; bathe emaciated babies; they drink a decoction or eat a root with bread, sour milk when bitten by rabid animals, when bitten by a snake; tincture of roots on vodka is drunk with stomach pains, colds, headaches; make lotions for bruises; a decoction of the whole herb is drunk with noise in the head, epilepsy. Used in homeopathy.
In folk medicine, a tincture or decoction of the herb is drunk for dysentery, chronic intestinal catarrh, as an analgesic and hemostatic agent. Sometimes taken orally for colds and nervous diseases.