Herb or soft shrub up to 1.5 m tall, erect, branched; roots tuberous; stems ascending, shortly and densely pubescent. Leaves petiolate; blade ovate-orbicular, 50-100 x 50-90 mm, densely tomentose, under-surface reticulate-veined with whitish gland-dots, apex obtuse, base cordate, margin crenate-dentate; petiole 40-70 mm long. Inflorescence usually with 1 or 2 pairs of branches near the base, racemes up to 200 mm long; flowers in sessile 3-5-flowered cymes forming 6-10-flowered verticils 10-25 mm apart. Calyx 6-7 mm long in fruiting stage, purple-tinged, glandular-hispid. Corolla mauve, not speckled, villous and dotted with white gland-dots on the back, 10-12 mm long; tube deflexed, expanding and spurred near the base, narrowing slightly towards the throat; upper lip 5-6 mm long; lower lip boat-shaped, 5-7 mm long, later deflexed. Stamens free, 2-3 mm long.
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