Erect caulescent herb or subshrub to 1 m tall. Stems woody at the base where sometimes shortly decumbent and branching; young stems densely pilose with glandular and eglandular hairs, reddish-tinged. Leaves opposite, pairs subequal to slightly unequal; blade elliptic, 6–11.5 cm long, 3–5 cm wide, often reddish-purple beneath, base asymmetric, shortly attenuate, margin entire, apex shortly acuminate, densely pilose above, less dense beneath except along the principal nerves; lateral nerves 7–12 pairs, obscured above; petiole 2–3 cm long, densely pilose. Inflorescences axillary to the upper leaves, solitary, lax, 2–16-flowered; peduncles 4.5–12 cm long, glandular-pilose, peduncles of old inflorescences often persisting at lower axils, then glabrescent and straw-coloured; pedicels 6–10 mm long, densely glandular- and eglandular-pilose; bracts lanceolate, ± 1.5 mm long, caducous. Calyx lobes lanceolate, 4.5–8 mm long, densely glandular- and eglandular-pubescent. Corolla blue-violet, paler at the mouth and within the tube, 40–60 mm long; tube narrowly cylindric, 25–37 mm long, ± 2 mm deep, sparsely pilose outside and around the open mouth; limb bilabiate, oblique; upper lip of two erect, rounded lobes, 7–8 mm long, 5.5–7 mm wide; lower lip 20–25 mm long, lateral lobes rounded-obovate, 10–11 mm long, 11–12 mm wide, median lobe obovate, 11–13.5 mm long, 10–13.5 mm wide, palate with two parallel dark violet streaks. Stamens arising near the apex of the corolla tube; filaments 2.5–4.5 mm long, pubescent; anthers purple, suborbicular, 2–2.5 mm wide, held at the corolla mouth, thecae indistinct. Ovary narrowly cylindric, 12–17 mm long, densely glandular- and eglandular-pubescent, narrowing into the style, 1.2–2.5 mm long, pubescent; stigma bilobed, 0.6–1.2 mm wide. Capsule 35–100 mm long, 2.5–3 mm diameter, glabrescent. Seeds ± 0.9 mm long, verruculose along longitudinal ridges.
