Erect or scandent shrubby herb; stems up to 1 m long, glabrous. Leaves opposite; petiole up to 6 cm long; lamina ovate to elliptic, largest 12–15≈5–6 cm, apex acuminate with obtuse to acute tip, base cuneate to attenuate, margin slightly crenate, glabrous or with a few scattered hairs above. Raceme lax, 4–10 cm long, glabrous; peduncle 1.5–5.5 cm long; bracts with orange glands, narrowly oblanceolate to elliptic, 8–13 mm long, glabrous; pedicels 1–2 mm long; bracteoles linear-lanceolate, 4–6 mm long, glabrous. Dorsal and two ventral sepals linear-lanceolate, 4–6 mm long, glabrous; two lateral triangular, ± 1 mm long. Corolla white with 2 purple bosses on lower lip, 17–20 mm long; tube 14–16 mm long, widening gradually near apex, glandular-pubescent outside, puberulous inside and with ring of hairs 3–4 mm above base; upper lip hooded, emarginate, lower lip spreading, lateral lobes lanceolate, 2–3 mm long, median lobe 3–4.5 mm long. Stamens included; filaments 3–4 mm long, sparsely puberulous near base; anthers ± 1 mm long, glabrous; stigma lobes similar. Capsule 5–8 mm long. Seed not seen. Fig. 4, 1–9, p. 22.
