Annual, 20-70(-150) cm tall. Stem usually erect, green-striped, sometimes yellow or tinged with red, rarely with red spots in leaf axils, branched especially in lower parts, branches spreading, fairly short. Leaves fairly thin, glabrous to farinose, greyish green, petiole as long as or shorter than blade; blade 2-5 cm long, elliptic to ovate, usually with a forward-projecting tooth or lobe on both sides near base; middle lobe ± oblong, with several teeth or sometimes subentire, obtuse to truncate at apex. Inflorescence a terminal, much branched rather loose panicle, leafless only in uppermost parts; bracts narrowly lanceolate, usually entire; glomerules small. Perianth segments 5, connate to the middle, slightly keeled on back. Stamens 5. Stigmas 2. Fruits falling with perianth. Pericarp fairly adherent. Seeds horizontal, black, 0.8-1.0 mm, roundish in outline, margin ± obtuse; testa with radial striae and radially elongated fairly shallow pits, with sinuous margins.