Perennial herb. Stems and leaves with scattered stinging hairs, so avoid skin contact. Stems mostly die back to a Perennial rootstock each winter, from which new stems emerge in the spring. Leaves are lanceolate, Ovate or triangular with the margins coarsely toothed up to 120 mm by 70 mm on stalks up to 70 mm long. Male and female flowers in separate inflorescences in the Axils of the upper leaves. Individual flowers are small and green.