Nepenthes dubia
A small highland pitcher plant endemic to Sumatra, known from Mount Talakmau and one other mountain at 1600–2700 m. It grows in stunted, fern-dominated ridgetop vegetation, as an epiphyte lower down and on moss clumps higher up. It is Critically Endangered, and needs cool nights, high humidity and bright filtered light.
Where it grows wild
Montane and upper montane forest with stunted ridgetop vegetation dominated by Dipteris and Dicranopteris ferns. Trees rarely exceed 3 m and few pitcher plants emerge above the vegetation. It grows as an epiphyte in montane forest; above about 2400 m it also grows on the ground on moss clumps. It grows alongside N. gymnamphora, N. izumiae, N. jamban and N. lingulata. Its pitcher fluid is thick and sticky.
Recorded from about 1600 to 2700 m (1800–2700 m on Mount Talakmau). The measured sites give 450, 1260 and 2880 m, so the site altitudes are uncertain.
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