Nepenthes albomarginata /nɪˈpɛnθiːz ˌælboʊmɑːrdʒɪˈnɑːtə/ is a tropical pitcher plant native to Borneo, Peninsular Malaysia, and Sumatra.

[9] A dense band of short white trichomes is present directly below the peristome, although these may be missing from pitchers that have caught termites.

[13] Its typical habitat consists of kerangas forest, but it has also been recorded from the summit vegetation of lowland peaks.

According to botanist Marlis A. Merbach and coworkers, this specialization to a single prey taxon is unique amongst carnivorous plants.

[15][16][17][18][19] Nepenthes albomarginata has a unique morphological feature: a rim of living white trichomes directly below the peristome.

Merbach said "For several days, nothing would happen, then — after a single night — pitchers would fill with termites and their rim hairs would disappear."

Merbach counted up to 22 individuals per minute falling into the pitchers and noted that the capture rate could easily exceed this for denser columns.

Merbach detected no long-range olfactory attraction during his experiments and noted that "all contacts seemed to happen by chance, with termites often missing pitchers less than 1 cm away from them."

In 2001, Clarke performed a cladistic analysis of the Nepenthes species of Sumatra and Peninsular Malaysia using 70 morphological characteristics of each taxon.

[4] N. albomarginata N. adnata N. gracilis N. reinwardtiana N. tobaica N. angasanensis N. mikei Nepenthes × cincta is a rare plant and, due to the localised distribution of N. northiana, only grows at a few sites in Bau, Sarawak, usually on a substrate of limestone.

The traits of N. albomarginata are very dominant in this hybrid; the wide flared peristome of its larger parent species (N. northiana) is almost completely lost.

Pitchers are narrowly infundibulate (funnel-shaped) throughout and range in colour from cream to dusky purple with red or black spots.