It is a hardy perennial herb native to northern areas of the Northern Hemisphere, including Europe, Asia, and almost all of Canada. The form is upright and is usually 20-45 cm in height, sometimes reaching up to 80 cm. It is a wetland-loving species and grows along fens and shorelines. The blue flowers are 1 to 2 cm long. The flowers are in pairs and are all on the same side of the stem. The flowers do not appear at the top of the stem.
Daugiametis augalas, paplitęs Eurazijoje. Aukštis 20-45 cm. Lapai trumpakočiai, priešiniai, pailgi, negiliai karbuotai dantyti, tamsiai žali. Žiedai melsvi, 10-20 mm ilgio, žydi liepos-rugsėjo mėnesiais. Auga pelkėtose vietose, vandens telkinių pakrantėse, grioviuose, krūmuose, daugiausia humusinguose arba durpiniuose dirvožemiuose.
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