Herbs perennial, monoecious. Rhizomes woody. Stems branched, to 150 cm tall; stems, at least when old, and petioles sparsely armed with stinging and setulose hairs. Stipules dark brownish, interpetiolar, connate, oblong, 7-14 mm, herbaceous, with several ribs, appressed puberulent abaxially, apex obtuse; petiole 1.5-4.5 cm; leaf blade black or dark brownish when dry, narrowly ovate to lanceolate, 5-15 × 2-6 cm, herbaceous, 5-veined, lateral basal veins reaching middle, secondary veins 3 or 4 on each side, anastomosing before margin, adaxial surface glabrescent, abaxial surface setulose, base rounded or cordate, margin dentate or doubly denticulate, apex acuminate; cystoliths punctiform, rarely botuliform. Inflorescences containing male and female flowers, paniculate, with few short branches, longer than petioles. Male flowers subsessile, in bud ca. 1 mm; perianth lobes connate 1/2 of length, sparsely puberulent. Female flowers: perianth lobes connate at base, dorsal-ventral lobes broadly ovate, setulose, lateral lobes ovate, ca. 1/4 as long as dorsal ones. Achene light brownish, broadly ovoid, slightly compressed, ca. 1 mm, verrucose, invested by persistent perianth lobes. Fl. Jul-Aug, fr. Sep-Nov.
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A shrub. It keeps growing from year to year. The rhizomes are woody. The stems are branched. It grows 1.5 m tall. It has some stinging hairs. The leaf blade is narrowly oval and 5-15 cm long by 2-6 cm wide. There are teeth around the edge.
It is a subtropical plant. It grows in open or slightly shady places in forests. In south China it grows near streams between 2,400-2,700 m above sea level. In Yunnan. In India it is recorded up to 5,940 m above sea level.
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