Terrestrial climber 1-3 m tall. Rosette and short stems unknown, climbing stems slightly flexuose, terete or 2-ridged, (2-)3(-4) mm diam., internodes 1-2 cm long. Leaves thinly coriaceous, sessile, glossy above, those of rosettes with bases semi-amplexicaul, those of climbing stems narrowly oblanceolate-oblong to lanceolate-oblong, 4.2-6.5 by 1.1-1.7(-2) cm, apex acute to rounded, not peltate, base slightly attenuate, clasping the stem for 1/3-1/2 its circumference, not decurrent. Longitudinal nerves 3 or 4 on each side of the midrib, scattered fairly evenly, fairly conspicuous above and below. Pennate nerves numerous, patent, straight, fairly conspicuous above and below. Lower pitchers not seen but reported similar to those of N. tentaculata (Clarke in Nepenthes of Borneo (1997) 109). Upper pitchers subcylindrical, the basal 1/4 obcampanulate, gradually becoming slightly constricted in the middle and then dilating slightly at the mouth, (5.2-)6.8-8.5(-9) by (1.4-)1.6-2.2(-2.5) cm, with two narrow, non-fringed wings 0.3-0.7 mm wide; mouth elliptic to broadly elliptic, slightly concave, oblique, peristome rounded, 0.8-1 mm wide, ribs indistinct, c. 0.2 mm apart, outer edge entire, inner edge without teeth; lid orbicular to transversely elliptic, (1.1-)1.5-2.1 by (1.4-)1.7-2.4 cm, apex rounded to truncate, base cordate to truncate, lower sur-face lacking appendages, midrib forking 3-4 mm before the apex; nectar glands conspicuous, sparsely scattered over the whole surface, bordered, circular, 0.1-0.2 mm diam.; upper surface lacking tentacles; spur stout, entire, dorsiventrally flattened, unbranched, 2.5-3 by 1 mm, apex rounded. Male inflorescence 9.5 by c. 1.8 cm; peduncle 1.5 cm long, 1.5 mm wide at base; partial peduncles 1-flowered, bracts absent; pedicels c. 50, 4-6 mm long; tepals elliptic, 3-3.5 by 1.5 mm, apex obtuse; androphore 2-2.5 mm; anther head 1.5 by 1.5 mm. Infructescence c. 8 cm long, with 11-13 fruits. Fruit with valves elliptic, (13-)15-19 by 5.5-7 mm. Seeds c. 90 per fruit, fusiform, 10-12 by 0.6-1 mm. Indumentum of sessile red glands on stem and lower surface of blade; midrib conspicuously pubescent with erect orange-brown simple hairs c. 0.2 mm long; pitcher, including spur, glabrous; inflorescence from peduncle to lower surface of tepals and base of androphore with scattered appressed coppery simple hairs 0.1-0.2 mm long. Colour on drying matt black; live plants with stems black or dark red, “pitchers ranging from dark red to almost black, with cream blotching. Lid of pitcher creamy white, often tinged pink. Lip yellow. Flower pale green maturing brown. Fruit like two pyramids end to end, upper half yellowish, lower half red.” (Lewis 354).
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