Description
Nepenthes adnata is a diminutive species. The stem is cylindrical in cross section and may be climbing or drooping. It rarely exceeds 2 m in length and 3 mm in diameter. Internodes are up to 10 cm long.
Leaves are coriaceous and sessile. The lamina is lanceolate-ellipsoidal and may be up to 10 cm long and 2 cm wide. It has an adnate base and an obtuse to acute apex. Two to three longitudinal veins are present on either side of the midrib. Pinnate veins are not easily distinguished. Tendrils may be up to 5 cm long.
Rosette and lower pitchers are ovoid in the lower third and cylindrical above. They are small, reaching only 10 cm in height and 2.5 cm in width. A pair of fringed wings (≤3 mm wide) runs down the front of terrestrial pitchers. The glandular region covers only the lower third of the inner pitcher surface. The pitcher mouth is round and slightly oblique throughout. The cylindrical peristome is up to 2 mm wide and bears indistinct teeth. The peristome is roughly symmetrical in cross section, with the inner portion accounting for around 54% of its total cross-sectional surface length. The lid or operculum is orbicular and cordate at the base. Multicellular hairs are sometimes present on its upper surface. An unbranched spur (≤2 mm long) is inserted at the base of the lid.
Upper pitchers are ovoid in the lower quarter and cylindrical to infundibular above. In aerial pitchers, the wings are usually reduced to ribs, but sometimes bear fringe elements. In most other respects, they are similar to lower pitchers.
Nepenthes adnata has a racemose inflorescence. The peduncle is up to 8 cm long. In male plants, the rachis reaches 10 cm in length, while in female plants it rarely exceeds 7 cm. Pedicels lack bracteoles and are up to 10 mm long. Sepals are lanceolate-ovate and around 4 mm long. Fruits are up to 40 mm long.
Short brown hairs are present on the edges of the lamina. The stem and lamina bear a sparse indumentum of simple white hairs (≤2 mm long). Inflorescences are covered with short, red-brown hairs.
The pitchers of N. adnata are generally speckled with reddish-purple blotches. The peristome is usually dark purple. The inner pitcher surface is white to light green. The stem and lamina are green throughout.
Nepenthes adnata varies little across its range. Consequently, no infraspecific taxa have been described.
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