Description
Nepenthes tenuis is a climbing plant. The stem is slender (2–3 mm thick) and angular to rhomboid in cross section. Internodes are 5-6.5 cm long.
Leaves are sessile and coriaceous. The lamina is lanceolate in morphology, 5–6 cm long, and 1-1.5 cm wide. It has an acute apex and is gradually attenuate towards the base, clasping the stem for two-thirds of its width (without a sheath). The lamina has indistinct nervation. Three or so longitudinal veins are present on either side of the midrib, originating from the basal third of the midrib and running parallel to it in the outer half of the lamina. Pinnate veins are oblique and irregularly reticulate, although they are not easily distinguishable. Tendrils are approximately 1.5 times as long as the lamina, growing to 12 cm in length and 0.5–1 mm in thickness. The tendrils may or may not curl around surrounding objects for support.
Nepenthes tenuis is one of the smallest-pitchered species in the genus, possibly only second to N. argentii. Upper pitchers gradually arise from the ends of the tendrils, forming a 10 mm wide curve. They are widely infundibuliform (funnel-shaped) throughout and contracted below the mouth. These aerial pitchers are usually 2.5-4.5 cm high and 1.5-2.5 cm wide. Both lower and upper pitchers lack wings or fringe elements. Instead, they bear two prominent ribs running down the front, 3–5 mm apart. The glandular region covers the entire inner surface of the pitchers. The glands are small and occur at a density of 600-800 per square centimetre. The pitcher mouth is ovate and almost horizontal. The flattened peristome may be up to 6 mm wide, bearing ribs spaced 1/8 mm apart. The lid is narrow-elliptic, lacks appendages, and possesses two prominent veins, one on each side of the midrib. It is usually 1.5-2.5 cm long and 0.5-0.8 cm wide. Glands are evenly distributed on the underside of the lid. An unbranched, 1 mm long spur is inserted close to the base of the lid.
Most parts of the plant are glabrous, although some may be covered with a sparse indumentum of simple hairs. Herbarium specimens are dark brown in colour. On living plants, the pitchers are yellow-green and often have varying amounts of red-brown blotches. The peristome may be yellow to dark brown.
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