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Herbs annual, 20-100 cm tall, not farinose (but young leaves and inflorescence rachis sometimes slightly tomentose). Stem erect, branched or unbranched, striate, ± stout, ribbed. Petiole 2-4 cm; leaf blade concolorous, triangular or rhombic-ovate, 3-8 cm (lower ones sometimes to 15 cm), narrower than or as wide as long, slightly succulent, base subtruncate or broadly cuneate, margin irregularly serrate, apex acute or acuminate. Glomerules few or many flowered, forming axillary or terminal, erect, spikelike panicles. Flowers bisexual and female. Perianth segments 3-5. Filaments slightly shorter than perianth; anthers oblong. Utricle lenticular; pericarp brown. Seed horizontal, oblique, or vertical, red-brown to black, sublustrous, 0.5-1 mm in diam., obscurely or obviously pitted, rim margin obtuse or acute. Fl. and fr. Jul-Oct.
Erect annual 3–10 dm; lvs on short or long petioles, triangular to rhombic-ovate or lanceolate, acute, sharply and coarsely toothed, truncate or cuneate at base, shining above, usually slightly white-mealy beneath when young, to 8 × 5 cm; cal smooth or white-mealy, its 5 segments rounded on the back; seeds horizontal, shiny dark brown, rounded at the margin, 1.0–1.2 mm wide; 2n=18, 36. Native of Europe, sparingly intr. in waste places in our range.
