Distribution and Habitat
Nepenthes sumatrana is endemic to the Indonesian provinces of North Sumatra and West Sumatra. It is best known from the hills around Sibolga, where it was first collected. The species has a patchy distribution and the full extent of its geographical range is uncertain. Specimens collected near Sawahlunto and named Nepenthes spinosa by Tamin and Hotta appear to be conspecific with N. sumatrana, although trips to the area in 1995 and 2001 failed to locate any plants.
Nepenthes sumatrana grows terrestrially in dense, undisturbed lowland forest on sandstone substrates. Moist, shady conditions appear to be vital to the survival of the species, as it has not been recorded from areas that have been cleared due to logging or agricultural activities. These requirements might explain the fragmented nature of its distribution and suggest that N. sumatrana is more seriously threatened with extinction than previously thought.
Plants are often found on very steep slopes. Seedlings of N. sumatrana have been recorded from open cliff faces, but it is uncertain whether these survive to maturity, as larger plants are only known from the forests, where their stems can use surrounding objects for support and climb into the canopy.
Nepenthes sumatrana has been recorded from elevations of between 0 and 800 m above sea level.
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