Terrestrial climber 6-9 m tall. Climbing stem terete 0.8-1.3 cm diam., sometimes ridged or winged, internodes c. 8 cm long, axillary buds not seen. Leaves chartaceous, petiolate, those of climbing stems lanceolate, elliptic or oblong, 30-39 by 7-12 cm; apex acute or rounded, sometimes peltate by < 1 mm, base attenuate or obtuse, petiole short, 7-15 by c. 1 cm, narrowly winged, these wings running down stem, to 0.3 cm broad, 5 cm long or petiole clasping stem by 1/3 its circumference and stem completely unwinged. Longitudinal nerves 3-7, some arising from midrib, running in outer 2/3 of blade, conspicuous. Pennate nerves numerous, oblique initially, then curving towards margin, reticulate in outer part of blade. Lower pitchers urceolate-globose, to 20 by 10 cm, fringed wings to 1.9 cm broad, fringe elements 0.3-0.5 cm long, dense; peristome rounded, to 1.5 cm wide, ribs 0.3-0.5 mm apart, outer margin entire, inner margin with teeth to 0.3 mm long, 1.5 mm long towards lid; lid orbicular, to 8 cm, apex rounded, base slightly cordate, lower surface lacking appendages, nectar glands dense throughout, thinly bordered or pit-like, shallow, orbicular, 0.2-0.4 mm diam.; spur simple. Upper pitchers infundibulate or broadly infundibulate, constricted at the mouth, (11-) 14-24 by 6-7.5(-9) cm, broadest 2/3 from base and then narrowing gradually to the mouth by 1.5-3 cm, rarely dilating at the mouth; wings in lower half 0.3-1 cm wide, unfringed, upper half with ridges, or the whole pitcher with ridges only; mouth subelliptic, almost horizontal, slightly or highly concave, the rear half rising to form a column; peristome rounded, 4-12 mm wide, ends at lid folding outwards forming two obtuse angles c. 2 cm long, ribs 0.5 mm apart, 0.3 mm high, conspicuous, outer edge entire, inner with teeth 0.5 mm long, decreasing to 0.3 mm long near lid; lid suborbicular(-elliptic), 5-6.3 by 5.2-6.5 cm, apex rounded to slightly retuse, base shallowly cordate to rounded, lower surface lacking appendages, glossy, nectar glands scattered over whole surface or absent from the central area, orbicular, pit-like, 0.2 mm diam.; spur filiform, c. 9 mm long, entire or shortly bifid. Male inflorescence c. 40 by c. 5 cm; peduncle c. 11 cm long, 0.7 cm diam. at base; partial peduncles c. 80, 1-or 2-flowered, 0.5-0.7(-2.5) cm long, bracts inserted along length; bracts filiform, patent, 1-2 mm long; pedicels 14-22 mm long; tepals 5-6 by 3-3.5 mm; androphore 3.5-5 mm long; anther head 1.5 by 1.5 mm. Fruit with stipe 2-3 mm long; valves 18-19 by 3.5 mm. Seed fusiform, 7-9 mm long. Indumentum generally sparse, simple on leaf margins and tendrils, stellate on pitcher surface and leaf underside, 0.15-0.3 mm wide, especially dense beneath blade margin; inflorescence brown puberulous with stellate hairs 0.1-0.2 mm diam. Colour of pitchers and flowers not known.
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