Herbs to 1 m tall. Stems purplish black, terete, glabrous; young shoots 4-angled, pubescent at nodes. Petiole 2-4 mm; leaf blade ovate to broadly ovate, 1.5-4 × 1-1.8 cm, thickly paper, both surfaces glabrous, secondary veins ca. 6 on each side of midvein, base cuneate, margin entire or subentire, apex acute to sometimes caudate. Spikes terminal, few flowered; peduncle ca. 1 cm, subglabrous; bracts linear to linear-lanceolate, 1.5-2 mm; bracteoles similar to bracts. Calyx ca. 7 mm, glabrous; lobes lanceolate-linear, apex acuminate. Corolla white, ca. 1 cm; lower lip ca. 4 mm, 3-lobed, lobes ovate and ca. 0.5 × 0.5 mm; upper lip subtriangular, ca. 3.5 mm, 2-lobed. Staminal filaments ca. 2.5 mm, glabrous; anther thecae linear, ca. 3 mm, spurred at base. Ovary ellipsoid, ca. 3 mm, glabrous, ovules 5 or 6 per locule; style ca. 7 mm. Capsule narrowly cylindric, 1-1.5 cm, glabrous. Seeds subglobose, ca. 1 × 1 mm, pubescent. Fl. Aug.
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