Climber to ± 15 m., perennial, glabrous throughout; stem stout, 4-angled, winged. Leaf-blades entire, broadly ovate to elliptic, 9–20 by 6–15 cm., base rounded to subcordate, apex abruptly acute or shortly acuminate-mucronate; margin entire, pinninerved, membranous; petiole 2–5 cm. Glands on petiole 3 pairs, wart-like; blade-glands absent. Stipules ovate or elliptic, 2–5 cm. long, acute to mucronate, narrowed at base, entire. Inflorescences 1-flowered, the peduncle (pedicel) 1.5–3 cm., inserted beside a simple tendril 10–20 cm.; bracts and bracteoles subovate, base cordate, apex acute-acuminate, 3–5.5 cm., entire, distinct, forming an involucre. Flowers 8–10 cm. in diameter, whitish or pinkish, corona threads purplish and pinkish banded and mottled. Hypanthium shallowly cup-shaped, ±1.5 cm. wide. Sepals ovate to ovate-oblong, 3–4 cm., concave, cucullate, corniculate. Petals ovate-oblong to oblong-lanceolate, 3–4.5 cm., obtuse. Corona composed of 5 series, outside 2 series of threads 3–5 cm., inward a series of tubercles and one of short threads, the innermost membranous, lacerate; operculum membranous, 4–6 mm. long, inward curved, denticulate; disk (limen) annular. Androgynophore 12–14 mm., thickened and provided with 2 annuli towards base (trochlea); filaments ± flattened, 7–8 mm.; anthers ± 7 mm. Ovary ellipsoid-oblong, 8–10 mm., glabrous; styles 10–12 mm. Fruit oblong-ovoid, 20–30 cm. long, fleshy with thick rind, terete or 3-grooved. Seeds many, broadly obcordate or suborbicular, 7–10 mm.
