Soft-wooded aromatic shrub to nearly 3 m high, densely clothed in glandular hairs. Young shoots and young lvs white-tomentose and with sessile glands, viscid. Petiole to c. 4 cm long. Lamina 6-20 × 4-13 cm, broad-ovate or elliptic-ovate, with abundant sessile glands beneath, fewer glands above when mature, ± dentate-serrate; base narrow-cuneate; apex ± rounded. Infl. racemose with remote whorls, sometimes with short lateral branches; rachis to c. 50 cm long, often purple; rachis, pedicels, bracts and calyx with viscid glands. Pedicels < bracts, 5 mm long, declinate; fls in whorls of 4-10. Calyx 5-8 mm long, accrescent; tube ± = limb, with long white hairs towards base; upper lip broad-ovate; lower 4 teeth lanceolate-subulate. Corolla 2-2.5 cm long, deep blue, ± hairy outside; tube ± = limb; upper lip ± erect, ovate, with lateral lobes small; lower lip longer, c. 1.5 cm long, horizontal to slanting downwards or deflexed, boat-shaped. Stamens declinate in lower lip, united below bend. Style exserted. Nutlets c. 1.7 mm diam., suborbicular, somewhat laterally compressed.