Terrestrial or epiphytic shrub or climber 2-8(-20) m tall. Stem triangular, rarely ± rounded, 3-7.5 mm diam., the corners rounded or 2 with wings up to 3 mm broad. Leaves chartaceous, sessile; basal rosette leaves not known; climbing leaves with blade narrowly elliptic to rectangular, or slightly oblanceolate (8-)11-25(-28) cm by 1.1-3.1(-4.5) cm, apex acute, base distinctly attenuate for 4-5 cm, or narrowing slightly at the stem, decurrent as wings by up to 8.5 cm, rarely only slightly decurrent, clasping the stem for 1/2 its circumference. Longitudinal nerves 1 or 2 (or 3) on each side of the midrib, usually in the outer third, ascending from the midrib. Pennate nerves, ascending from the midrib, sometimes extending into longitudinal nerves, inconspicuous. Lower pitchers rarely collected, ellipsoid in the basal half, gradually becoming slightly constricted towards the subcylindrical upper half, up to 11 by 4 cm, 3 cm wide at the apex, with two fringed wings, the mouth ± ovate, oblique, peristome ± cylindrical in section, 0.5-1(-1.25) mm wide, without ribs, the inner edge with a row of minute, deeply sunken hollow glands, not dentate; lid ovate-shortly elliptic, up to 3.9 by 3.7 cm, apex rounded, base truncate, lower surface without appendages, nectar glands thickly to thinly bordered, fairly dense, evenly sized and spread, orbicular, 0.15-0.2(-0.3) mm diam.; spur simple, to 3 mm long. Upper pitchers as the lower but slightly ventricose, 9-19.5(-31) cm long, 3.2-4.8(-6.8) cm wide at the base, 1.8-3.4(-4.1) wide at the waist, 2-5.7(-6.2) cm wide at the mouth; with two ridges to 0.1 cm broad lacking fringing elements; the inner pitcher surface glaucous, usually with 2 (rarely 0, 1, or 3) conspicuous darker eye-like dots 1(-5) mm wide set symmetrically c. 1 cm apart on the dorsal wall of the pitcher more or less level with the front of the peristome; lid 2.1-5.2 (-7.8) by 2.1-4.7(-6.5) cm. Male inflorescence 20-38 cm long; peduncle 2.8-10 cm long, 3 mm diam. at base; partial peduncles 2-flowered, 0.2-1 cm long; bracts absent; pedicels 1-1.5 cm long; tepals ± elliptic 3.5-4 by 2.5 mm; androphore 0.25-0.3 mm long; anther head 0.7-1 by 1.5 mm. Fruits with valves 28-40 mm long. Seeds fusiform, 18-20 mm long, minutely tuberculate at the centre. Indumentum absent from the stem and leaves, rarely present on the pitcher just below the peristome; inflorescence covered, sometimes only sparsely, with appressed brownish hairs c. 0.2 mm long that extend from the rhachis to the lower surface of the tepals, the androphore and the ovary; fruit glabrous. Colour of pitcher light green, rarely suffused red or with red spots; flowers reddish black.
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