Terrestrial or epiphytic, climbing shrub to 15 m tall. Stem terete, 5-10 mm diam., internodes of climbing stems 20-35 cm long. Leaves coriaceous, petiolate; blade narrowly oblong, 15-20 by 4-6 cm, apex acute, base cuneate; petiole 6-10 cm long, canaliculate, clasping the stem for up to 3/4 its circumference, not auriculate or decurrent. Longitudinal nerves 2 or 3 on each side of the midrib in the marginal half, conspicuous. Pennate nerves numerous, patent, reaching the margin, conspicuous. Lower pitchers rarely collected, as the upper pitchers, but with two fringed wings 1-7 mm wide, fringed elements 2-3 mm long, 3-5 mm apart. Upper pitchers papery, subcylindrical, lower 1/4-1/3 ovoid, upper part narrowly cylindrical to infundibuliform, 10-35(-50) by 2-6(-15) cm, lacking fringed wings, but with two low ridges; mouth elliptic, markedly oblique, concave, gradually rising to the vertical or overarching the mouth, forming a stout column; peristome rounded, 6-12(-25) mm broad, ribs 4-6 mm high, 3-9 mm apart, outer edge not sinuate or curved, inner edge coarsely dentate, teeth up to 10 mm long; lid orbicular, 3-8.5 cm diam., apex rounded, base cordate, lower surface lacking appendages, nectar glands, sparsely scattered, minute, pit-like, not bordered, c. 0.2 mm diam.; spur stout, entire, ± 10 mm long. Male inflorescence 30-40 by 3.5 cm; peduncle 15 cm long, 5 mm diam. at base; partial peduncles 1-flowered; pedicels 6-20 mm long; bracts absent; tepals elliptic, 4 by 1.5-2 mm; androphore 2-3 mm long; anther head 1 by 1 mm. Fruit valves 20 mm long. Seed fusiform, 8 mm long, central part smooth. Indumentum of stem, midrib, pitcher and inflorescence sparsely hairy with simple red-brown hairs 0.5-0.75 mm long, eventually glabrescent. Colour of pitcher yellowish green, sometimes suffused with orange; peristome darker; inner pitcher white.
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