Nepenthes neoguineensis

Species of pitcher plant from New Guinea

Nepenthes neoguineensis /n//ᵻ/'/p//ɛ//n//θ//iː//z// /,/n//iː//oʊ//ɡ//ɪ//n//i/'/ɛ//n//s//ɪ//s/ is a tropical pitcher plant native to the island of New Guinea, after which it is named.

Nepenthes neoguineensis was first collected in 1828 by Alexander Zipelius near Triton Bay, New Guinea. Two further collections were made by nl on June 19 and September 25, 1907. N. neoguineensis was again collected on May 10, 1910, by Knud Gjellerup. The first name applied to this species was Nepenthes leptoptera by Hermann Zippel in 1900. However, this name is not valid as it only appeared on the label of a herbarium specimen (HLB.908.154 597) deposited at the National Herbarium of the Netherlands in Leiden. The specimen was collected from New Guinea. The species is relatively widespread in New Guinea, ranging across the entire length of the island and occurring in both Papua New Guinea and the Indonesian portion of the island (Western New Guinea). As such, its conservation status is listed as Least Concern on the 2006 IUCN Red List of Threatened Species. In the wild, N. neoguineensis occurs sympatrically with N. ampullaria and N. maxima.

Danser considered N. tomoriana from Sulawesi and N. distillatoria from Sri Lanka to be the closest relatives of N. neoguineensis. He also noted its similarity to N. papuana, stating: "N. papuana is so much alike N. neoguineensis in its vegetative parts, that only the complete knowledge of the generative parts has suggested me to establish a new species".

Where their ranges overlap, N. neoguineensis is known to hybridise with N. ampullaria and N. maxima. The hybrid plants are generally intermediate in appearance between their parent species.