Vigorous woody twiner to 25 m or more, forming large tangles and often completely covering large trees; young branches glabrous or puberulous at nodes. Leaves glossy; petiole 1.5–5 cm long, glabrous; lamina lanceolate to triangular ovate, largest 13–20.5≈4–10.5 cm, apex acuminate, base truncate to cordate, without or with rounded to hastate lobes, margin subentire or with a few large teeth, glabrous, with whitish pustules along major veins above. Flowers in pendulous racemoid cymes to 30 cm long; peduncle to 11 cm long, glabrous, with a pair of leafy sessile bracts to 8≈4.5 cm at base of cyme; pedicels 2–4.5 cm long, glabrous; bracteoles oblong to obovate, 2.5–4≈1–2 cm, subacute to rounded, apiculate, truncate at base, glabrous. Calyx an entire or slightly undulate puberulous rim. Corolla pale mauve to mauve or purple; cylindric tube ± 1 cm long; throat broadly campanulate, 3–4 cm long, 2–3 cm in diameter apically; lobes 3–4≈3–4 cm. Filaments 9–15 and 11–17 mm long, glabrous; anthers narrowly oblong, 7–9 mm long, indistinctly apiculate, bearded at base and almost to apex along one side with long hairs with small lateral spinules; all thecae spurred, spurs 4–5 mm long, flattened. Capsule subglobose, 13–15 mm in diameter, glabrous, beak 25–30 mm long, parallel-sided. Seed 8–12 mm in diameter.
