the base of the lid. Upper pitchers are much larger, growing up to 15 cm high and 10 cm wide. Wings are reduced to ribs that run down the front of the pitcher. The greatly expanded peristome may reach 3.5 cm in width in aerial pitchers. The lid does not cover the mouth completely, being narrowly ovate. It is up to 5 cm long and 2 cm wide. The crater-like glands on the underside of the lid may be up to 1.5 mm wide. These glands are so large that they are visible as swellings on the upper surface of the lid. The spur is simple and up to 1 cm long. Pitchers range in colour from light green to dark purple throughout and may be lightly speckled. The most common form of this species has green pitchers with a red peristome. Nepenthes jacquelineae has a racemose inflorescence. In male plants, the peduncle is up to 12 cm long and the rachis up to 20 cm long, whereas in female plants the peduncle is up to 20 cm long and the rachis up to 10 cm long. The rachis bears one- or two-flowered partial peduncles. Sepals are ovate-lanceolate, up to 7 mm long, and 4 mm wide. Each male inflorescence bears approximately 100 flowers, whereas each female inflorescence bears around 60 flowers. Mature fruits are up to 2.5 cm long. The stem and leaves of N. jacquelineae are glabrous throughout. The outer surfaces of the pitchers are covered with short, white stellate hairs. Developing pitcher buds are densely covered with simple, red-brown hairs, most of which are lost as the pitcher develops, with the exception of those on the spur. Female inflorescences usually have a denser indumentum than male inflorescences. Ecology Nepenthes jacquelineae is endemic to the Barisan Mountains that line the western side of Sumatra. More specifically, it is known only from the Indonesian province of West Sumatra. It usually occurs as an epiphyte, but also grows terrestrially. The species has an altitudinal distribution of 1700–2200 m above sea level. The typical habitat of N. jacquelineae is dense mossy forest, which is almost constantly shrouded in fog and experiences daily rainfall. As a result, humidity levels are always high and the climate is cool. Plants are exposed to relatively low light levels, as sunlight is diffused by fog and vegetation. The species is relatively common at the type locality,