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Robust annual or short-lived perennial herb, monoecious. Stems soft, erect or decumbent, up to 2 m long, with sparse to dense stinging hairs when young, glabrescent, stiff hairs sometimes present. Leaves broadly lanceolate to ovate, 100-160 x 58-104 mm, apical tooth longer than broad, base cordate, margin with 25-40 pairs of small close-set teeth, surface often bullate, with dense or sparse stinging hairs scattered on upper surface and concentrated along veins on lower surface, stiff hairs sparse, usually on lower surface; petiole 40-125 mm long, with both stinging and stiff hairs; stipules deciduous, linear-lanceolate to lanceolate, 3-8 x ±2.5 mm, with long-acuminate apex, with bristly hairs. Inflorescences loosely branching panicles, with clusters of flowers; female in upper axils, up to 180 mm long; male in axils below female ones, up to 100 mm long. Female flowers with pedicels broadly, laterally winged, stinging hairs dense to sparse, bristly hairs usually in two lines along peduncle or sometimes over whole peduncle. Male flowers 4-merous, usually with stinging hairs, stiff hairs present, ±0.5-1.0 mm in diameter. Achenes shortly stipitate, laterally compressed, ±2 mm in diameter, centre of flattened sides irregularly rugose and pale brown, margin smooth and black-brown, dispersed without perianth.
Annual or perennial herb, 0.5-1.5 m high; monoecious, stinging hairs. Leaves alternate, ovate, stinging hairs above, stiff hairs along veins below, base cordate, apex acuminate, margins coarsely serrate, up to 40 teeth; petioles up to 125 mm long; stipules lanceolate, up to 15 mm long. Inflorescence of loosely branched panicles; male inflorescence in axils of lower leaves, ± 100 mm long; female inflorescence in axils of upper leaves, ± 180 mm long. Male flowers pedicellate, in clusters up to 1 mm in diam., 4-merous, usually with stinging hairs. Female flowers with broadly winged pedicels, stinging hairs dense to sparse; stigma filiform. Flowering time Jan.-Mar. Fruit shortly stipitate achenes, ± 1 mm long, pale brown, centre of flattened side irregularly rugose.
Leaves usually fallen from lower part of the stem at anthesis, 8–15 x 4–8 cm., ovate; apex acuminate; base cuneate, rounded or subcordate; margin coarsely serrate with 25–35 teeth per side less than 5 mm. long; upper surface of lamina with stinging hairs and a few stiff hairs, lower surface pubescent.
Inflorescences unisexual, much branched panicles; male inflorescences up to 10 cm. long, usually in the axils of the lower leaves; female inflorescences up to 20 cm. long, usually in the axils of the upper leaves, on peduncles 4–9 cm. long.
A herb. It grows 50 cm tall. The leaves are alternate and oval. They taper tot he tip and are rounded at the base. They are 9 cm long by 6 cm wide. The flowers are in compound groups. There are hairs on the leaf and flower stalks.
Annual or short-lived perennial herbs to 1.5 m. tall, monoecious, with numerous stinging hairs on all aerial parts, but without glandular hairs; stems soft but somewhat woody at the base, erect or decumbent.
Erect, annual or short-lived perennial herb, up to 2 m high. Leaf margin with 28-40 pairs of teeth. Male flowers with 4 tepals. Achene laterally compressed, margin smooth and blackish brown. Perianth green.
Female flowers with broadly winged pedicels, wings broadening to c. 1.3 mm. in fruit; flowers in fan-shaped clusters, perianth tepals unequal, stigma filiform.
Achene slightly stipitate, c. 1 mm. long, laterally compressed with the centre of the flattened sides irregularly rugose, shed with the perianth.
Male flowers pedicellate, in clusters 2–3 mm. in diam., perianth 4-merous, mostly with stinging hairs.
Stipules up to 1.5 cm. long, lanceolate, fused for more than half of their length.
A robust perennial herb, to 3 ft. high
Petiole 5–10(12) cm. long.
