Large woody climber into forest canopy. Branchlets glabrous. Leaves opposite; petiole 5-8 mm long, glabrous or minutely papillose-puberulent, bases meeting across stems to form a slight interpetiolar ridge; blade ovate, oblong or elliptic, often remarkably different shapes on the same branch, (3.1-)5.3-21 by (2.4-)2.7-8.7 cm, 1.1-4.7 times as long as wide, apex acuminate with a blunt apex, or very rarely obtuse or rounded (but on the same plant where leaves have acuminate apices), base rounded to cuneate, glabrous above, glabrous to minutely papillose-puberulent on midrib beneath, 15-28 pairs of secondary veins, straight to weakly ascending, anastomosing into a weakly looped intramarginal vein, tertiary venation reticulate. Inflorescence a robust terminal panicle, occasionally also axillary, 4-12 cm long, many-flowered; flowers fragrant; peduncle 0-4 cm long, minutely and sparsely puberulent; pedicels 1.2-8 mm long, densely puberulent. Sepals oblong, 2.1-3.6 by 1.7-2.8 mm, 1-1.8 times as long as wide, apex rounded, glabrous or puberulent at base, ciliate. Corolla white or white with a yellowish throat; bud head ovoid, apex acute to obtuse; tube 8-21 mm long, 3.8-6.5 times as long as sepals, 1.3-2.9 times as long as lobes, minutely and densely pubescent outside, densely pubescent inside from just below stamens to over half way up tube but glabrous at top of tube and in throat; lobes axe-shaped, projection rounded to acute, 3.5-13 by 4.7-13.5 mm, 0.6-1 times as long as wide, pubescent on part of lobes exposed in bud outside, glabrous inside; corona of 10 free lobes, paired in each sinus, glabrous, 1.5-2.5 mm long. Stamens inserted at 3-5.3 mm from corolla base which is 0.2-0.3 of tube length; filament 1-1.8 mm long; anthers 1.6-2.6 by 0.5-0.6 mm. Ovary 1.5-2 mm high; style 1.2-2.5 mm long; style head 1.6-2.5 mm long. Fruit globose, 6-7 cm across, green or brown. Seeds 7.3-8 by 5-5.2 by 2.1-2.4 mm.
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Liane. Leaves with petiole 3–7 mm long; lamina elliptic-oblong to elliptic-lanceolate, 4.5–21 cm long, 2–8 cm wide, rounded at base, acute or short-to long-acuminate; secondary veins 18–20 each side of midrib; tertiary venation reticulate, prominent. Inflorescence dichasially branched, to 10 cm long. Flowers 13–18 mm long, 8–13 mm diam.; pedicels 0.8–2 mm long. Sepals ovate, 2–2.6 mm long. Corolla cream; tube 10–13 mm long, 1–2 mm diam.; lobes obovate, 5–11 mm long, 4–10 mm wide. Corona of 5 club-like lobes 2.4–2.5 mm long, adnate to base of corolla lobes. Fruit not seen.
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