Herbs 15-30 cm tall. Stems subterete, basally prostrate and rooting at nodes then erect, sulcate, bifariously pubescent. Petiole 0.5-1.5 cm, pubescent; leaf blade ovate, 4-9 × 2.5-4.5 cm, thinly papery, abaxially pubescent along veins, adaxially glabrous, secondary veins ca. 5 on each side of midvein, base narrowly cuneate, margin shallowly undulate, apex acute. Racemes terminal, spiciform, 17-18 cm, branchless or trifurcate branched, with 3 flowers per node; peduncle 5.5-10 cm, pubescent; bracts subulate, 1.5-2 mm, abaxially pubescent; bracteoles similar to bracts. Pedicel ca. 1 mm, pubescent. Calyx ca. 6 mm, 5-lobed almost to base; lobes narrowly triangular, ca. 5 × 0.6 mm, margin ciliate, apex acuminate. Corolla yellow, ca. 1 cm, outside puberulent; lower lip ca. 3.2 mm, patent, 3-lobed, lobes ovate and apex rounded; upper lip subdeltoid, ca. 2.5 mm. Staminal filaments ca. 3 mm, glabrous; anther thecae ellipsoid, superposed, lower one spurred at base. Ovary glabrous; style ca. 6 mm, glabrous. Capsule not seen. Fl. May-Jun.
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