Perennials. Primary root slender and long. Stems diffuse, pubescent, rooting from nodes. Petiole 1.5-6.5 cm, densely pubescent. Basal leaves rosulate, rotund, ovate-orbicular, or elliptic, 1-6 X 0.8-4 cm, pubescent, base abruptly cuneate and decurrent, margin repand and crenate. Stem leaves opposite or alternate, similar to basal leaves. Peduncle slender, densely pubescent. Calyx broadly campanulate, 3-5 mm, deeply 5-lobed, outside densely villous; lobes ovate, 2-2.5 mm, veins conspicuous. Corolla white or light red; tube 6-8 mm; lower lip middle lobe 7-9 mm, lateral lobes 5.5-7.5 mm; upper lip erect, 4-6 mm, lobes apically subtruncate and with few irregular small teeth. Ovary rotund, with dense clavate glandular hairs. Stigma unequally 2-lobed. Capsule ovoid. Fl. Jun-Jul, fr. Aug-Sep.
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