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Erect herb to 40 cm high, annual. Indumentum uncoloured. Stems with sparse sessile and stalked stellate trichomes. Stipules linear-lanceolate, 0.8–1 mm long, entire. Leaf lamina elliptic to oblanceolate, 5–22 mm long, 4–18 mm wide; base cordate to truncate; margins crenate, with 4–7 teeth; tip acute to obtuse; venation palminerved with 5 veins at base and 2 or 3 lateral veins per side of midrib, tertiary reticulate veins obscure; lower surface pale green, venation weakly visible, with sparse sessile & stalked stellate trichomes; extrafloral nectaries 2 at top of petiole, ellipsoid, sessile. Male flowers: pedicels c. 0.3 mm long; sepals lanceolate-ovate, 0.9–1 mm long; petals obovate, c. 0.8 mm long; stamens 9–12. Styles 3, bifid once. Fruit trilobate, globose, 4–5 mm long, 4–5 mm diam., with sparse sessile and stalked stellate trichomes.
Annual, 2–6 dm, roughly stellate-hairy; lvs narrowly oblong to oblong-ovate, 3–7 cm, coarsely serrate, with 1 or 2 large glands at the summit of the petiole; staminate fls with 4 sep, 4 pet, and 7–9 stamens; pistillate fls with 5 sep and no pet, each of the 3 styles bifid nearly to the base; 2n=16. Dry or sandy soil; widespread in trop. and subtrop. Amer., n. to Va., Ind., Io., and Neb., and adventive farther north. Ours have been called var. septentrionalis Müll. Arg.
