Herbs to 1 m tall. Stems 4-angled, basally prostrate and rooting at nodes, sulcate, glabrous. Petiole 2-15 mm, glabrous; leaf blade elliptic to obovate-elliptic, 3-10 × 1.2-4.2 cm, apical half broadest, papery, glabrous, secondary veins 5 or 6 on each side of midvein, base cuneate, margin subentire, apex caudate. Spikes axillary, 1-3 cm, interrupted; peduncle 0.5-1.5 cm; rachis sulcate, puberulent, 1-flowered per node; bracts linear-triangular, 3-4 mm, abaxially puberulent, margin ciliate; bracteoles ovate, 2.5-3 mm, margin ciliate. Calyx ca. 4 mm, 5-lobed almost to base; lobes narrowly triangular, outside glabrescent, inside glabrous. Corolla white, ca. 1.1 cm, outside slightly retrorsely pubescent; tube as long as limb; lower lip 3-lobed, lobes ca. 2.5 mm and apex rounded; upper lip ca. 5 mm, apex emarginate. Staminal filaments ca. 3 mm, glabrous; anther thecae superposed, lower one minutely spurred at base. Ovary glabrous; style ca. 5 mm, glabrous. Capsule not seen. Fl. Oct.
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