Perennials, to 40 cm tall. Stems 1 or 2, subquadrangular, hollow, apically puberulent to lanose when young, glabrescent. Petiole 1-2 cm; leaf blade ovate to elliptic, 4-6 cm, abaxially glabrous or puberulent, base obtuse, margin serrate or occasionally double serrate. Thyrses terminal, spikelike, 4-10 cm, capitate; cymes opposite or whorled; lower whorls 2-5 cm apart; peduncle short; rachis, peduncle, and pedicel densely puberulent. Calyx ca. 4 mm; lobes ovate-orbicular. Corolla yellow-green, ca. 8 mm; tube subglobose, ca. 4 mm; lower lip middle lobe smaller than lateral lobes; upper lip ca. 2 mm longer than lower lip, lobes obovate, with overlapping margins. Stamens slightly shorter than lower lip; staminode ca. 0.5 mm, obovate. Ovary ca. 3 mm. Style ca. 4 mm. Capsule globose-ovoid, ca. 8 mm. Fl. Jun-Jul, fr. Jul-Aug.
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