Stems ca. 20 cm, base trailing, tinged purple-red, retrorse pilose. Petiole 2-3 mm; leaf blade spatulate, 1-2.5 cm × 7-10 mm, papery, adaxially sparsely minutely hispid, abaxially sparsely spreading ciliate, base cuneate, margin 2-6-crenate-serrate, apex acute to obtuse. Verticillasters 2-8-flowered, ca. 1.5 cm in diam. after anthesis, in upper axils, slightly crowded; peduncle 1-2 mm; floral leaves gradually reduced, bractlike; bracts needlelike, 2-2.5 mm, shorter than pedicels, ribbed. Calyx tubular-campanulate after anthesis, ca. 5 × 2 mm, tinged purple-red, veins and throat sparsely white ciliate, base slightly swollen on 1 side; upper teeth reflexed, triangular, apex acuminate; lower teeth straight, awned. Corolla nearly included in bud, puberulent. Nutlets yellow-brown, subglobose, ca. 0.9 mm in diam. Fr. Nov.
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