Terrestrial climber to 5 m tall. Stem terete, 0.3-0.6 cm diam. Leaves coriaceous, sessile, obovate-oblong, to 16 by 3.1 cm, apex acute to rounded, base clasping at least half stem, auriculate. Longitudinal nerves (0 or) 1-3 (or 4) on each side of the midrib in the outer half. Pennate nerves irregular. Lower pitchers shortly cylindric, 5-10 by 1-2.5 cm; slightly ventricose in lower half, cylindric and somewhat narrowed in the upper half, with two fringed wings, 0.3 cm wide, fringe elements to 0.5 cm long. Upper pitchers long cylindric, to 18(-24) by 2.5 cm, basal half gradually infundibulate, upper half gradually narrowing but broadening again at mouth, and usually broadest there; wings usually absent, or very much reduced; mouth ovate, oblique, slightly concave; peristome cylindrical, 0.5-1 mm wide, ribs 0.25 mm apart, inconspicuous, outer and inner edge entire; lid orbicular, often slightly broader than long, c. 3.2 by 3.8 cm, apex rounded, base cordate, lower surface lacking appendages, nectar glands circular, not bordered, 0.1-0.3 mm diam.; larger and denser near centre where 0.4 mm diam.; spur somewhat flattened at base, with 3-7 branches above, 3-10 mm long. Male inflorescence 20-36 by 1.8-2.8 cm; peduncle 8-11 cm long, 1.5-2 mm diam. at base; partial peduncles 1-flowered, rarely 2-flowered at base, c. 60; bracts filiform, (1-)2-3 mm long, spreading, inserted 0-2 mm from base of pedicel; pedicel 8-10.5 mm long; tepals elliptic, c. 4.5 by 2 mm; androphore 2.5-3 mm long; anther head 1.5-2 by 1.5-2 mm. Fruit valves 20 by 3 mm. Seed fusiform, 12 mm long, central body tuberculate. Indumentum on stems sparingly tomentose, upper and lower surface of midrib tomentose, hairs branched, 0.3-0.5 mm long; other parts subglabrous. Colour of lower pitchers maroon-green to deep blackish green, inner surface glaucous pale green; upper pitchers either purple-green throughout, peristome deep red or pale green, or pale green throughout, inner surface of pitcher glaucous pale green.
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