Nepenthes albomarginata is a tropical pitcher plant native to Borneo, Peninsular Malaysia, and Sumatra.
Nepenthes rafflesiana, or Raffles' pitcher-plant, is a species of tropical pitcher plant. It has a very wide distribution covering Borneo, Sumatra, Peninsular Malaysia, and Singapore. Nepenthes rafflesiana is extremely variable, with numerous forms and varieties described. In Borneo alone, there are at least three distinct varieties. The giant form of this species produces enormous pitchers rivalling those of N. rajah in size.
Nepenthes ampullaria is a very distinctive and widespread species of tropical pitcher plant, present in Borneo, the Maluku Islands, New Guinea, Peninsular Malaysia, Singapore, Sumatra, and Thailand.
Nepenthes gracilis, or the slender pitcher-plant, is a common lowland pitcher plant that is widespread in the Sunda region. It has been recorded from Borneo, Cambodia, Peninsular Malaysia, Singapore, Sulawesi, Sumatra, and Thailand. The species has a wide altitudinal distribution of 0 to 1100 m above sea level, although most populations are found below 100 m and plants are rare above 1000 m. Despite being a widespread plant, natural hybrids between N. gracilis and other species are quite rare.
Nepenthes tentaculata, or the fringed pitcher-plant, is a tropical pitcher plant with a wide distribution across Borneo and Sulawesi. It grows at altitudes of 400–2550 m.
Nepenthes hirsuta, the hairy pitcher-plant, is a tropical pitcher plant endemic to Borneo. It is characterised by an indumentum of thick brown hairs, which is even present on the inflorescence. Pitchers are mostly green throughout with some having red blotches on the inside surfaces.
Nepenthes reinwardtiana is a tropical pitcher plant native to Borneo and Sumatra and to a number of smaller surrounding islands including Bangka, Natuna, Nias, and Siberut. Although some sources have included Peninsular Malaysia and Singapore within the range of this species, these records appear to be erroneous.
Nepenthes veitchii, or Veitch's pitcher-plant, is a Nepenthes species from the island of Borneo. The plant is widespread in north-western Borneo and can also be found in parts of Kalimantan. It grows in lowland Dipterocarp forest, typically near rivers, and on ridgetops in mossy forests, from 0 to 1,600 meters elevation. Nepenthes veitchii usually grows as an epiphyte, though the form from Bario seems to be strictly terrestrial and has not been observed to climb trees.
Nepenthes mirabilis, or the common swamp pitcher-plant and tropical pitcher plant, is a carnivorous plant species. By far the most widespread of all Nepenthes, its range covers continental Southeast Asia and all major islands of the Malay Archipelago, stretching from China in the north to Australia in the south. The species exhibits great variability throughout its range. One of the more notable varieties, N. mirabilis var. echinostoma, is endemic to Brunei and Sarawak and possesses an extremely wide peristome.
Nepenthes stenophylla, or the narrow-leaved pitcher-plant, is a tropical pitcher plant endemic to Borneo. The species produces attractive funnel-shaped pitchers up to 25 cm high. It is listed as Least Concern on the IUCN Red List. Nepenthes stenophylla belongs to the loosely defined "N. maxima complex", which also includes, among other species, N. boschiana, N. chaniana, N. epiphytica, N. eymae, N. faizaliana, N. fusca, N. klossii, N. maxima, N. platychila, and N. vogelii.
Nepenthes sanguinea is a large and vigorous Nepenthes pitcher plant species, native to Peninsular Malaysia and southernmost Thailand, where it grows at 300–1800 metres altitude. It is primarily a terrestrial species, but can grow as an epiphyte in the wet biome of upper montane forests. The pitchers are variable in size, from 10–30 cm tall, and range from green and yellow to orange and red. The insides of the pitchers are usually speckled with its two main colors. It was introduced to Victorian Britain around 1847 by Cornish plant hunter and botanist Thomas Lobb via the Veitch Nurseries.
Nepenthes macfarlanei is a carnivorous pitcher plant species endemic to Peninsular Malaysia. It produces attractive red-speckled pitchers. Lower pitchers are ovoid or infundibular in the lower half and globose or cylindrical above and up to 25 cm high. Upper (aerial) pitchers are of a lighter colour with wings reduced to ribs. The lower surface of the lid is densely covered with short, white hairs. This is a characteristic morphological feature of this species, but at present its function is unknown.
Nepenthes maxima, the great pitcher-plant, is a carnivorous pitcher plant species of the genus Nepenthes. It has a relatively wide distribution covering New Guinea, Sulawesi, and the Maluku Islands. It may also be present on Wowoni Island.
Nepenthes ephippiata, or the saddle-leaved pitcher-plant, is a tropical pitcher plant endemic to Borneo. It occurs in the Hose Mountains of central Sarawak, as well as Mount Raya and Bukit Lesung in Kalimantan. It grows in montane forest from 1,000 to 1,900 meters elevation.
Nepenthes gracillima is a highland Nepenthes pitcher plant species, native to Peninsular Malaysia.
Nepenthes densiflora is a tropical pitcher plant endemic to Sumatra, where it grows at an altitude of between 1700 and 3200 m above sea level.
Nepenthes × trichocarpa, the dainty pitcher-Plant, is a common natural hybrid involving N. ampullaria and N. gracilis. It was originally thought to be a distinct species and was described as such.
Nepenthes × sharifah-hapsahii is a natural hybrid between N. gracilis and N. mirabilis. It has been recorded from Borneo, Peninsular Malaysia, Sumatra, and Thailand, although it was originally described as a species endemic to Peninsular Malaysia, where it was said to grow at elevations below 1000 m.
