Erect, annual herb 0.3-0.6 m tall; stems solitary with conspicuous patent bristles along the upper part. Leaves petiolate; blade membranous, ovate, 35-70 x 20-35 mm, subglabrous, apex acute, base obtuse to cuneate or attenuate on the petiole, margin coarsely toothed. Inflorescences produced mainly after the leaves are shed, terminal and from the nodes often from near the base to the apex of the plant, racemose, 40-120 mm long, simple or branched; flowers numerous, solitary or occasionally in pairs on slender pedicels, opposite or alternate. Calyx 2 mm long at flowering, increasing to 10 mm in fruit, tubular and slightly curved; upper tooth ovate, erect; lower 4 teeth lanceolate-subulate, horizontal. Corolla yellow, 4-5 mm long, slightly geniculate and expanding near the base. Stamens free or shortly united at the base.
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