A perennial herb with segmented thin threadlike rhizomes and underground shoots. Stems erect or ascending from the base, 30-90 cm tall, four-sided, grooved. The leaves are oblong-elliptical or lanceolate-elliptical (bottom — can be almost pinnatifid), are short, and irregularly sinuate-toothed or krupnopilchatye on the edge, both sides covered with short, single-celled or multicellular long hairs, mixed with pieces of iron, especially beneath the veins. The flowers are small, numerous, clustered in dense axillary whorls. Bracts small, linear-lanceolate, running into a barbed wire along the edges ciliate. Calyx campanulate, almost regular, glandular pubescent, cut into five linear-lanceolate teeth with a long subulate end exceeding corolla or equal to it. Corolla four-bladed, yellowish-white, with purple dots on the outside slightly hairy, bell-shaped, with almost equal shares (only one upper wider). Fruitlets truncated obovate, flattened, about 1.5 mm. Blooms in June and October, the fruits ripen in July and October.
Eurasian species, which grows on the Atlantic coast of Europe to Japan and from Scandinavia to the Himalayas. In our country, in the European part, the Caucasus, Dagestan and Siberia. In Central Russia met in all areas frequently.
It grows on the banks of ponds, ditches, wet meadows, wet forests, grassy marshes.