Bot. Jahrb. Syst. 49: 277. 1913.
Plants annual, 3–5 dm; roots also often arising from proximal nodes. Stems decumbent to ascending, glabrous except for fleshy, retrorse, whitish hairs at nodes. Leaves: ocrea brownish or hyaline, cylindric to funnelform, 4–10 mm, chartaceous, base inflated or not, margins oblique, eciliate, surface glabrous or with bristlelike hairs proximally; petiole 0.1–3 cm, winged to base, leaves sometimes sessile; blade ovate-deltate, 1.5–5 × 1–4 cm, base rounded to truncate, margins glabrous or scabrous, apex acute, faces pilose and glandular-punctate abaxially, glabrous adaxially. Inflorescences terminal and axillary, 5–10 × 5–10 mm; peduncle 2–20 mm, apex stipitate-glandular; ocreolae overlapping, margins eciliate. Pedicels mostly ascending, 0.1–1 mm, flowers sometimes sessile. Flowers 1–2 per ocreate fascicle; perianth white to pink or lavender, urceolate, glabrous, scarcely accrescent; tepals 4(–5), oblong to broadly elliptic, 2.5–3 mm, apex acute to obtuse; stamens (5–)8, filaments distinct, free; anthers purplish black, elliptic; styles 2, connate proximally. Achenes included, dark brown to black, biconvex, 1.5–2 × 1–1.5 mm, dull, minutely punctate.
Phenology: Flowering Jul–Oct.
Habitat: Disturbed sites, gravel bars in lowland zone
Elevation: 0-900 m
Introduced; B.C., Conn., Fla., Mass., N.Y., Pa., Asia, introduced also in Europe, Africa.