Epiphytic or terrestrial climber (rarely a shrub) 0.5-6(-10) m tall, climbing by means of the clasping, distichous leaf blades. Stem often flexuose, ± terete, rarely 2-ridged, 4-10 mm diam. Leaves coriaceous, petiolate, obovate to oblanceolate, rarely suborbicular (10-)14-25 by 4-10 cm, apex truncate to retuse, rarely acute, base cuneate to ob-tuse; petiole to 5 cm long, canaliculate, sheathing the stem, not auriculate, but rarely with two decurrent wings reaching the node below. Longitudinal nerves 2-4 on each side of the midrib in the outer half, often inconspicuous. Pennate nerves slightly oblique, faint near margin, inconspicuous. Lower pitchers broadly cylindrical, broadest near the middle, 15-28 by 4-10 cm, with two fringed wings 4-5 mm wide, fringed elements 5-7 mm long, 3-4 mm apart; mouth ovate, horizontal in front, abruptly concave behind, rising into a long, broad, stout column terminating c. 9 cm above the front of the mouth; peristome flattened, 4-15 mm wide at front, 10-80 mm wide near lid, the ribs 0.5-1 mm apart, outer edge undulate, inner edge with teeth 2-4 mm long; lid held towards vertical, at obtuse angle with mouth, narrowly ovate or elliptic, 3-9 by 1.75-5 cm, apex acute to rounded, base rounded, with a laterally flattened asymmetrical appendage c. 6 mm high, 20 mm long on the lower surface near the peristome and often a smaller one at the apex, glands dense, crater-like, orbicular, c. 0.2 mm diam., on the appendages elliptic, 1.75 mm long; spur entire, slender, 3-14 mm long, inconspicuous. Upper pitchers as the lower, to 30 by 8.5 cm, with two fringed wings 5-10 mm wide, fringed elements c. 10 mm long, 2-7 mm apart. Male inflorescence 17-45 cm long; peduncle 14-27 cm long; partial peduncles c. 50, 2-(or 3-)flowered, 0.5-2 mm long; bracts absent; pedicels 9-14 mm long; tepals elliptic, 4 by 1.5 mm; androphore 2.5-4 mm long; anther head 1 by 1.5 mm. Fruit long and slender, valves 35(-40) by 2-2.5 mm. Seed fusiform, c. 18 mm long, central part tuberculate. Indumentum dense, spreading, of simple, coppery hairs 3 mm long, on stem, lower leaf, tendril and pitcher, including lower surface of lid when young, becoming sparser, in places glabrous, when mature. Colour of pitcher golden yellow or green, rarely splashed with red, peristome striped red and yellow or all green, yellow or brown.
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