Herbs, 5-40 cm tall. Rhizomes slender, ca. 5 mm in diam, usually with small globose nodules. Stems hollow, erect, subquadrangular, glandular hairy. Petiole to 2 cm; leaf blade ovate, 1-3 cm, abaxially densely hairy, adaxially glabrous or sparsely hairy, base rounded to subcordate, margin subentire to irregularly coarsely toothed. Cymes 1-or 2-flowered, solitary in upper axils or in a subterminal and narrow inflorescence; peduncle 1-2.5 cm, glandular hairy. Pedicel shorter than peduncle, glandular hairy. Calyx 4-5 mm, glandular hairy; lobes oblong-ovate to ovate-lanceolate, apex obtuse to acute. Corolla greenish white, ca. 1 cm; tube subglobose; lower lip lobes rotund; upper lip conspicuously longer than lower lip, lobes obovate. Stamens shorter than lower lip; staminode subglobose. Ovary slightly shorter than style. Style 4-5 mm. Capsule ovoid, ca. 8 mm. Fl. and fr. May-Aug.
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