Monoecious annual or biennial, 20-100 cm tall herb, with sparse stinging hairs. Stem quadrangular. Leaves with 2-10 cm long petiole; lamina ovate to broadly ovate, 2-10 cm long, 2-8cm broad, truncate or subcordate-cordate at the base, margin shallow to deeply Serrate, apex acuminate; stipules free lateral, triangular-ovate to lanceolate, 3-6 mm long, membranous. Racemes bisexual, male flowers spiked, female flowers in terminal globose long peduncled head, c. 1 cm in diameter. Achenes broadly ovate, c. 2.5 mm long, c. 2 mm broad, dark brown, enclosed by enlarged dorsal sepals.