Description
Nepenthes macrophylla is a climbing plant. The stem reaches a length of more than 10 m and is up to 10 mm in diameter. Internodes are up to 35 cm long and circular in cross section.
Leaves are coriaceous and petiolate. The lamina or leaf blade is oblong in shape and reaches exceptionally large dimensions of up to 60 cm by 20 cm. The apex of the lamina is acuminate-obtuse, while the base is abruptly contracted where the petiole begins. The petiole itself is up to 15 cm long. It is canaliculate (grooved lengthwise) and typically bears wings that form a partially amplexicaul sheath around the stem. One to three longitudinal veins are present on either side of the midrib, but pinnate veins are indistinct. Tendrils measure up to 35 cm in length.
The pitchers of N. macrophylla are robust and almost woody in texture. Rosette and lower pitchers are shortly cylindrical in shape, becoming narrower around the midpoint. They can be very large: up to 35 cm high by 15 cm wide. A pair of fringed wings (≤10 mm wide) runs down the ventral surface of the pitcher. Terrestrial pitchers usually have a hip in their lower half. The pitcher mouth is ovate and has an oblique insertion. The peristome is cylindrical and expanded, measuring up to 15 mm wide. It bears a series of highly developed ribs, which terminate in prominent downward-pointing teeth. The pitcher lid or operculum is ovate, very broad, and has a cordate base. An unbranched spur (≤9 mm long) is inserted near the base of the lid. Upper pitchers are similar to their lower counterparts in most respects. They differ in having a more cylindrical shape, reduced wings, and the hip always being located in the upper half. Traps may have a range of colours, although the yellow-pitchered form is more common than the red-pitchered form.
Nepenthes macrophylla has a racemose inflorescence, with both male and female ones having a similar structure. The peduncle is up to 23 cm long and 5 mm wide, while the rachis is up to 55 cm long. Pedicels are one-flowered, bracteate, and measure up to 16 mm in length. Sepals are elliptic in shape and up to 6 mm long.
Most parts of the plants bear an indumentum of very short hairs, although much of this covering is caducous.
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