Annual herb up to 1.5 m tall, often much branched. Leaves petiolate; blade ovate or rhombic-ovate, 30-60 x 20-28 mm, variously pubescent, usually paler and softly tomentose beneath, apex acute, base cuneate to truncate, margin crenate-serrate; petiole 15-25 mm long. Inflorescence of lax racemose panicles; flower clusters (paired cymes) relatively small, glomerate, spaced up to 20 mm apart; bracts much reduced upwards; bracteoles ovate to oblong. Calyx 4-5 mm long in fruit, hispidulous. Corolla pale mauve to purple, 5-6 mm long.
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