Terrestrial climber 1-4 m tall. Stem terete, 4-5(-8) mm diam., internodes of short stems 0.5-1 cm long, of climbing stems 2-4.5(-10) cm long. Leaves coriaceous, subsessile; leaves of short shoots and rosettes oblanceolate, 10-19 by 3-5.5 cm wide, the lowermost 1/8-1/10 narrowed to a winged, poorly defined petiole, leaf bases shortly sheathing, amplexicaul, encircling the entire stem circumference; leaves of climbing shoots narrowly elliptic, 18-27(-28.5) by 4-6 cm wide, tapering to an acute apex, the basal 1/5-1/6 (i.e. up to 4-5 cm long), usually narrowed to c. 1 cm wide and resembling a winged petiole, base sheathing, encircling c. 1/3 the stem circumference, upper-most leaves smaller, 6-10(-14) by 1.6(-3.2) cm, subsessile. Longitudinal nerves 3-5 on each side of the midrib in the outer half, conspicuous above and below. Pennate nerves numerous, held at ± 90° from the midrib, inconspicuous, not reaching the marginal nerve. Lower pitchers ovoid or ellipsoid, tapering into a shortly cylindrical upper part, 11-18 cm long, 5-6(-7.5) cm wide at the base, tapering to 2.5-4(-5) cm wide below the peristome, with two fringed wings 2.5-3(-6) mm broad, the fringed elements 3-6(-15) mm long, (1-)2-2.5(-3) mm; mouth ovate, apex long-acuminate, oblique; the peristome cylindrical to slightly flattened, 3-5(-15) mm wide, with pronounced ribs 0.25-0.5 mm apart, 0.1-0.2 mm high, outer edge rarely slightly sinuate in largest pitchers, inner surface with broad stiff, slightly forward curved teeth 0.3-1 (-2) mm long; column short and broad, the peristome teeth expanded in two protuberant ridges; lid broadly to narrowly ovate or elliptic, 2.5-4.5(-6.2) by 2.7-3.2 cm, apex rounded, base shallowly cordate, lower surface without appendages, with several large circular or elliptic crater-like glands along the midline 0.3-0.5 mm long and numerous smaller, circular ones 0.2-0.1 mm diam., towards the margin, absent at the edge; spur simple 4-15 mm long. Upper pitchers as the lower, but much less commonly produced, cylindrical, rarely ovoid-cylindrical or infundibuliform-cylindrical, 10-15.5 by 2.5-4.7 cm, with wings 0.5-4 mm wide, usually fringed, the fringed elements up to 13 mm long, 3-4 mm apart; peristome 2.5-5 mm wide; lid ovate or ovate-oblong, 2-4.7 by 1.8-2.7 cm. Male inflorescence (18-)22-25 by 3 cm; peduncle 10.5-12 cm, 2 mm diam. at base; partial peduncles 2-flowered, 35-65, 1-3 mm long, bract 0.25-0.5 mm long, inconspicuous; pedicels (4-)5-8 mm long; tepals elliptic, (3.75-)5-5.5 by 2-2.5 mm, apex rounded; androphore (3.5-)6 mm long; anther head 1.25 by 1.25 mm. Fruits with valves 35-42 by 3.5-4 mm. Seeds filiform, 25 by 0.25 mm. Indumentum of stems, lower surface of midribs and inflorescences densely, less usually feebly, substrigose to pilose, with fragile, but not caducous, brown, subappressed, stiff, simple (rarely a few 1-3-branched) hairs (0.5-)1-2 mm long, hair bases swollen; lower leaf blade with sessile red glands very sparsely scattered with patent simple hairs c. 0.5 mm long. Colour of lower pitchers green or grey-green splashed with red; upper pitchers always green; tepals red with black spots on inner surface; androphore maroon; anthers white.
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