Erect herb, 0.5-1 m high. Stem and branches finely puberulous. Leaves thin-membranaceous, ovate to broadly ovate, 6-12 by 4-6 cm, acute, base truncate or cuneate, entire, margin elsewhere remotely crenate, very sparsely pubescent on the main and secondary veins on both surfaces; petiole 1-4.5 cm. Flowers in terminal panicles, 10-15 cm long, the lower branches 5-6 cm. Bracts ovate, acute, 2-3 mm long, caducous. Calyx obliquely campanulate, 2-2.5 mm long, in fruit 6-7 mm, shortly hirsute and sparingly gland-dotted, unequally 5-toothed; upper tooth broadly ovate, subrounded; two lateral teeth shorter (about ¾ than the lower teeth (later almost equal in fruit); two lower teeth subulate, connate beneath. Pedicels 3-4 mm long, glandular-puberulent. Corolla boat-shaped, pinkish purple, 7-8(-10) mm long, puberulent, tube decurved, only slightly gibbous near the base, upper lip short, erect, lower lip concave, enclosing the stamens and style. Stamens in 2 pairs; filaments free from each other from the point of attachment to the corolla tube. Nutlets oblong ovoid, black, 1 mm long.
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