Herbs, sometimes subshrubs, often prostrate, 50-100(-160) cm, monoecious or dioecious. Stems 4-angled distally, pubescent. Leaves opposite, stipules broadly ovate, ca. 2.5 mm; petiole 1-4 mm; leaf blade narrowly lanceolate, rarely narrowly ovate or elliptic, (1.2-)3-10 × (0.7-)1.2-2.8 cm, herbaceous or thinly papery, 3(or 5)-veined, adaxial surface sparsely strigillose or subglabrous, abaxial surface sparsely pubescent along veins or subglabrous, base subcordate or rounded, apex acuminate or acute. Glomerules often bisexual or sometimes unisexual, 2-9 mm in diam. Male flowers: pedicel 1-5 mm; buds ca. 2 mm in diam.; perianth lobes 5, oblanceolate, 2-2.5 mm, apex acute. Female flowers sessile; perianth tube ovoid, ca. 1.6 mm, longitudinally 10-winged, apex 2-toothed. Achene white to black, ovoid, ca. 1.4 mm. Fl. May-Jul, fr. Aug-Sep.
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A herb that keeps growing from year to year. It is a creeping shrub. It can grow 1 m tall. The leaves are more than 1 cm wide and about 3 cm long. They are opposite and thin. The leaves can be 2-12 cm long and 1-4 cm wide.
It is a subtropical plant. It grows in wet places at low to medium altitudes in Taiwan. In Northeastern India it grows between 1,900-2,200 m above sea level. In Sichuan and Yunnan.
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Sunny stream banks in valleys and weed patches alongside woodlands. Weedy places, thickets by ditches and rice fields at elevations of 100-1000, occasionally to 2700 metres.
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