Stout climber, up to 15 m high. Old stem terete, 1.5-2.5 cm ø. Branches subterete or slightly flat, 5-7 mm ø, glabrous. Leaves subcoriaceous, broad-ovate or ovate, 13-19 by 9-15.5 cm; apex acute or short-acuminate; base almost truncate, slightly concave, or rounded; glabrous above, glabrous but papillate in the areolae beneath; nerves palmate, basal nerves 2 pairs, each nerve with a few lateral, oblique branches, the inner pair of nerves reaching the apex, the outer pair much shorter; nerves elevated and prominent beneath, distinct above; veins loosely transverse or reticulate, slightly elevated beneath, faint above; petiole stout, terete, glabrous, 6-12 cm. Bracts linear, 3.5-5 mm long, glabrous. Pedicel and ovary 3-4 cm, glabrous. Flowers cauligerous, fasciculate. Perianth straight, veins loosely reticulate, glabrous outside; utricle ellipsoid or subglobose, 6-7.5 by 5-6 mm, flanged at the base, hairy inside, with 6 ellipsoid or orbicular, glandular bodies (c. 1.5 mm long); tube 15-20 by 2 mm, hairy inside; limb 1-lipped, linear, 45-50 by 7-12 mm, papillate on the upper surface. Stamens 6; anthers oblong, c. 0.7 mm long. Style column 2 mm long, 6-lobed; lobes deltoid, c. 1 mm long, basal parts forming a distinct annular ring. Capsules cylindric, 6.5 by 1.2 cm, slightly 6-furrowed, obtuse on both ends. Seeds broad-ovate, c. 4 by 3 mm, granular on both surfaces, not winged.
Ridge top in primary forest, hill slope in disturbed mixed dipterocarp forest, and also in secondary forest, up to c. 600 m. Fl.--05; fr. June, July.
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