Herbs, erect, 2-4 dm; branches opposite to subopposite or clearly alternate. Stems often red striped, weakly angular. Leaves: petiole 2-15(-25) mm; blade triangular-or lance-hastate, 5-70(-80) × 3-50 mm, ± lobed or dentate to entire, distal ones lanceolate and entire but with short hastate lobes. Flowers in interrupted spicate inflorescences, terminal on main stem and branches, and axillary glomerules loose and widely spaced, with linear or lance-linear bracts. Bracteoles becoming yellow brown in age, sessile or the axillary bracteoles with a stipe 2-5+ mm, ovate-triangular to ovate, 5-7 mm, margin with lateral angles not clearly produced, entire or with a single tooth, apex acuminate, faces smooth, sparsely scurfy, rarely with 2 thin, weak tubercles. Seeds dimorphic: brown, round, 2.5-3.5(-4) mm wide, with radicle basal to subbasal and divaricate most abundant, or black, round, 2-3 mm, with radicle basal and divaricate. 2n = 36.
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