Herbs to 50 cm tall, perennial. Stems basally slightly decumbent then erect; young branches 4-angled, sulcate and striate, bifariously pubescent, glabrescent. Petiole 3-8 mm; leaf blade ovate to rarely lanceolate, (1-)3-9 × (0.5-)1.5-4 cm, papery, both surfaces glabrous, secondary veins 4 or 5 on each side of midvein, base slightly oblique and cuneate to subrounded, margin subentire, apex shortly acuminate. Spikes axillary, ca. 1 cm, (1-)3-5-flowered; bracts lanceolate, 1-3 mm, glabrous; bracteoles linear, ca. 1.5 mm. Calyx ca. 4 mm, 5-lobed; lobes lanceolate, outside glabrous except pubescent along midvein. Corolla white or greenish white, 8-9 mm, outside pubescent; lower lip elliptic, 3-lobed, lobes ovate with an obtuse apex; upper lip narrowly triangular, 2-lobed. Ovary slightly hirsute at tip; style basally hirsute. Capsule ca. 7 cm, glabrous. Seed light yellow, papillate. Fl. Aug-Sep, fr. Nov-Jan.
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