Herbs, slender, to 20 cm tall, unbranched. Rhizomes slender, sometimes with small globose nodules. Stems hollow, narrowly winged, striate. Leaves on lower nodes scalelike, otherwise leaf blade broadly ovate, 0.2-3 cm, adaxially glabrous or sparsely pubescent, base truncate to subcordate, margin with few irregular large teeth or double toothed. Cymes mostly from upper leaf axils, 1-flowered, rarely 2-flowered. Pedicel slender, more than 2.5 cm, puberulent to subglabrous. Calyx ca. 3 mm; lobes ovate-oblong, apex subobtuse to acute. Corolla white, subcampanulate, ca. 8 mm; lower lip lobes narrow; upper lip almost as long as lower lip, lobes broadly rounded, with overlapping margins. Stamens slightly longer than corolla tube; staminode small, narrowly spatulate. Ovary 1.5-2 mm. Style 5-6 mm. Fruit unknown. Fl. Jun-Jul.
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