Perennial herb, 0.5-1 m. Stem and branches densely brownish woolly. Leaves thin-to thick-membranaceous, ovate, broadly ovate or sub-rounded, 2.5-5 by 1.5-3.5 cm, acute or bluntly acute, base rounded or cordate, entire; margin elsewhere coarsely serrate or crenate, sericeous above, densely woolly beneath; petiole 0.2-1 cm, the upper leaves sessile. Flowers 10-20 in axillary verticillasters, distributed at distant nodes. Bracts linear-lanceolate, 7-10 mm, ciliate. Calyx tubular campanulate, straight, densely silky sericeous outside, 10-12 mm long, in fruit 11-13 mm, including the teeth; teeth 9-10, filiform, unequal, 2-3 mm, ciliate. Corolla tube equalling the calyx, annulate within, lower lip 4-5 mm long, woolly. Nutlets ellipsoid, 1.5-2 by 1 mm, obtuse at the apex, smooth.
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