Annual, 10-150 cm, usually erect, variously branched, ± grey farinose. Stems yellowish to green, green-striated, sometimes reddish or with red spots at leaf axils. Lower and medium leaves petiolate, blade usually 2-6(-10) cm, variously trullate, rhombic-ovate to lanceolate, clearly longer than broad, base narrowly to broadly cuneate, margins irregularly serrate to entire, often somewhat 3-lobed, teeth mostly acute, often unequal in size; uppermost leaves lanceolate, usually entire. Inflorescence a variable spiciform or cymosely branched panicle, mostly terminal. Perianth segments 5, dorsally keeled. Perianth falling with fruit. Pericarp thin, ± adherent. Seeds horizontal, black, 1.1-1.5 mm in diameter, somewhat ovate, margin weakly acute; testa with faint radial striae, otherwise almost smooth.