Plants annual, (0.5-)1-7(-13) dm; roots also often arising from proximal nodes; rhizomes and stolons absent. Stems procumbent, decumbent, ascending, or erect, simple or branched, without obvious ribs, glabrous or appressed-pubescent. Leaves: ocrea light brown, cylindric, 4-10(-15) mm, chartaceous, base inflated, margins truncate, ciliate with hairs 1-3.5(-5) mm, surface glabrous or strigose, rarely with spreading hairs, not glandular-punctate; petiole 0.1-0.8 cm, glabrous or strigose, leaves sometimes sessile; blade often with dark triangular or lunate blotch adaxially, lanceolate to narrowly ovate, (1-)5-10(-18) × (0.2-)1-2.5(-4) cm, base tapered or cuneate, margins antrorsely strigose, apex acute to acuminate, faces glabrous or strigose, especially along midveins, sometimes glandular-punctate abaxially. Inflorescences terminal and axillary, erect, usually uninterrupted, 10-45(-60) × 7-12 mm; peduncle 10-50 mm, glabrous or, rarely, pubescent; ocreolae overlapping or sometimes interrupted proximally, margins ciliate with bristles 0.2-1.3(-2) mm. Pedicels ascending, 1-2.5 mm. Flowers 4-14 per ocreate fascicle, homostylous; perianth greenish white proximally and roseate distally or entirely roseate, not glandular-punctate, scarcely accrescent; tepals 4-5, connate ca. 1/ 3 their length, obovate, 2-3.5 mm, veins prominent, not anchor-shaped, margins entire, apex obtuse to rounded; stamens 4-8, included; anthers yellow or pink, ovate; styles 2-3, connate proximally. Achenes included or apex exserted, brownish black to black, discoid or biconvex to 3-gonous, (1.9-)2-2.7 × (1.5-) 1.8-2.2 mm, shiny, smooth. 2n = 44.
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A slender annual herb. It grow 1 m tall. The leaves usually have purple mark near the centre of the leaf blade. The flowers are pink or red.
Damp shady places. A common weed of cultivated land, avoiding shade. Weedy, moist semiwaste to cultivated area. Streamsides, wet areas, field margins; at elevations from 100-1,800 metres.
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