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Genus :


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Species of this Genus


Annual or perennial, monoecious or dioecious, robust herbs, armed with stinging hairs. Stem sympodial, zigzag, 5-angled. Leaves alternate, stipules intrapetiolar, foliaceous; petiolate; leaf blade 3-nerved, margins dentate or lobed, cystoliths punctiform. Inflorescence solitary or in axillary pairs, paniculate cymes or spikes, unisexual; male inflorescence often long, flowers clustered on rachis of spikes, dichotomous cymes or panicles; female glomerules lax or dense on rachis of scorpioid cymes, spikes or panicles. Male flowers: perianth lobes 4 or 5, valvate, filaments inflexed in bud. Female flowers: perianth lobes 4, 2 or 3 lobes connate into a tube, 2-3 toothed; staminodes absent; ovary ovoid, stigmas subulate. Achenes large, slightly oblique, compressed, verrucose. Seeds with thin or without endosperm.