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Herbs perennial, erect or ascending, rarely prostrate, almost simple or few branched at base, 12-40 cm tall; rootstock often tuberous; branches sometimes with short branchlets, strigillose. Leaves often opposite, sometimes alternate on lower or upper stems; stipules triangular, 2-6 mm; petiole 0.2-1.8 cm; leaf blade ovate or broadly ovate, lanceolate or narrowly lanceolate, usually 1.2-9 × (0.6-)0.8-3 cm, smallest ones on short branchlets, herbaceous, secondary vein 1 or 2 pairs, abaxial surface sparsely or sometimes densely strigillose or strigose along veins, adaxial surface glabrous or sparsely strigillose; base cuneate to rounded, rarely subcordate, margin entire, apex subobtuse, acuminate, or shortly so. Glomerules often bisexual, 2.5-5 mm in diam., bisexual ones in nodes of proximal leaves, female in distal axils; bracts triangular, 2-3 mm, ciliate. Male flowers: perianth lobes 4, narrowly oblong or oblong-oblanceolate, connate to middle, 1.2-1.5 mm, puberulent, apex acute or cuspidate. Female perianth tube ellipsoid or rhombic, 0.8-1 mm, 1.5-1.8 mm in fruit, puberulent, inconspicuously ca. 9-ribbed or 4-winged, apex 2-toothed. Achenes white, light to dark yellow or light brown, ovoid, 1-1.2 mm. Fl. Jul-Aug, fr. Aug-Oct.
A small herb. It keeps growing from year to year. It grows 40-80 cm tall. The base of the plant can creep along the ground and form roots at the nodes. The leaves have leaf stalks and are thinly hairy. The lower leaves occur opposite one another and the higher leaves are alternate. The leaf blade is oval and 3.5 cm long by 1 cm wide. The side veins end at the edge of the leaf. The male and female flowers are in separate round heads in the axils of leaves. The flowers are greenish. The fruit is dry and oval and ribbed.
Plants 1-20 dm, sparsely to moderately covered on all parts with appressed and spreading hairs. Leaf blades 1-5 × 0.6-2 cm, base rounded to broadly cuneate, apex acute or nearly acuminate. Staminate flowers ca. 3 mm across; filaments longer than tepals; pistillode elongate, knoblike. Pistillate flowers ca. 1-1.5 mm, tepals ribbed. Achenes ca. (0.9-)1.2 × ca. 0.6 mm, base truncate.
