Stems 14-30(-40) cm, erect, brownish to whitish puberulent, glabrescent. Normal leaves sessile or with petiole to 7 mm; leaf blade whitish to green or purplish, oblique, ovate to ovate-oblong, 3.2-13 X 1-4.5 cm, adaxially sparsely puberulent, abaxially sparsely puberulent along veins, base strongly oblique, cuneate on narrow side, subcordate to broadly cuneate on other, margin indistinctly or distinctly denticulate to serrate, seldom dentate, apex acute to acuminate; reduced leaf blade broadly ovate, 4-14 mm. Cymes axillary; peduncle 3-4.5(-6) cm, glandular puberulent. Calyx 5-sect from base; segments ovate, 3-4(-5) X 1.5-3 mm, outside glabrescent to sparsely puberulent. Corolla white to purplish or reddish, 1-1.8 cm, outside glabrous, inside sparsely puberulent basally and below abaxial lip; tube subtubular, 0.8-1.2 cm X 4-8 mm; adaxial lip 2-4.5 mm; abaxial lip ca. 4.8 mm. Filaments 2-5 mm, puberulent; anthers ca. 0.7 mm wide; staminode linear, ca. 0.8 mm. Pistil 3-6 mm, glabrous. Style 1-4 mm; stigma 1, elliptic. Capsule ca. 4 mm in diam. Fl. Jul-Sep, fr. Sep-Oct.
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