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Erect annual (or very short-lived perennial) herbs, monoecious or dioecious by abortion, with long stinging hairs on all aerial parts; cystoliths punctiform. Leaves alternate, petiolate, simple or mostly variously divided, margin coarsely serrate; stipules intrapetiolar, fused almost to apex. Inflorescence unisexual, consisting of dense elongated cymes in axils of upper leaves; the ♂ ones thinner and more spike-like than the ♀ ones. Male flowers pedicellate, 4–5-merous, regular, with large rudimentary ovary. Female flowers sessile, with 3 almost completely fused tepals which ± enclose the ovary, sometimes also with 1 minute, membranous, free tepal; staminodes absent; ovary ± asymmetrical, reflexed, laterally compressed, with sessile, filiform stigma. Achene laterally compressed, rugose, released from the perianth.
Female flowers sessile, with 3 almost completely fused tepals ± enclosing the ovary, sometimes also with one minute free tepal; staminodes absent; ovary ± asymmetrical, reflexed, laterally compressed, with a sessile, filiform stigma.
Inflorescences unisexual, consisting of dense, elongate cymes in the axils of upper leaves, male inflorescence thinner and more spike-like than the females.
Erect annual (or short-lived perennial) herbs, monoecious or dioecious by abortion, with long stinging hairs on all aerial parts.
Leaves alternate, petiolate; lamina elliptic to ovate, mostly variously divided, margin coarsely serrate, always triplinerved.
Achene laterally compressed, rugose, released from the perianth.
Male flowers pedicellate, 4–5-merous with a rudimentary ovary.
Stipules intrapetiolar, fused almost to the apex.
Cystoliths dot-like.
