Shrub or climber to 2-3 m tall. Stem rounded or angular, often greatly contracted, 0.1-0.6 mm diam., internodes up to 8 cm long. Leaves thinly coriaceous, sessile, those of climbing stems lanceolate, 5-14 by 1.2-2.8 cm, apex acute, base decurrent as converging wings or ridges for c. 2 cm below the node. Longitudinal nerves (0-)3 or 4 (or 5) on each side of the midrib in outer 1/3-1/4 of the lamina. Pennate nerves distinct or indistinct, running obliquely from midrib and forming an irregular network in the outer 1/2 of the blade, fairly conspicuous. Lower pitchers obovoid throughout, or somewhat cylindric above, c. 11 by 4 cm, with 2 fringed wings up to 8 mm broad, the fringe ele-ments to 4 mm long, or the wings reduced to 2 ridges; mouth suborbicular, straight, oblique; peristome 1-5 mm broad, ribs 0.3-0.5 mm apart, outer edge entire, teeth on inner margin to 0.3 mm long; lid orbicular, flat, 2.5-4 cm diam., apex rounded, base rounded to cordate, lower surface lacking appendages but often with the midline thickened into a low keel c. 1 mm high, nectar glands throughout, dense, orbicular, thinly bordered, 0.1-0.2 mm diam., 1500-2000 glands/cm2, larger (0.4 mm long) and longitudinally elliptic along midline; less usually much larger, 3 mm diam. overall with thickened borders (1.5 mm within borders); spur simple, sometimes flattened, 1-5 mm long. Upper pitchers cylindrical, slightly constricted in the upper 1/2, rarely obovoid throughout, 4-14 by 1-3 cm, lacking fringed wings, otherwise as the lower pitcher. Male inflorescence 8.5-14 cm long; often much contracted; peduncles 5.5-7 cm long, 2 mm diam. at base; partial peduncles 1-flowered; pedicels to 10 mm long; bracts absent; tepals elliptic, 2.2-3 by 1.8-3.3 mm; androphore 1.5-2.5 mm long; anther head 0.7-1.25 by 1.5 mm. Indumentum very sparse, sparsely woolly-scurfy, pale brown, 0.2-0.4 mm long on new innovations, but becoming glabrescent except on inflorescence and tendril where inconspicuously puberulent with patent simple, black hairs c. 0.3 mm long. Colour of pitchers green, the peristome red, interior of pitcher pale green, sometimes suffused with red.
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