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 abgracilis is a tropical pitcher plant native to the Philippines. It is known only from northeastern Mindanao, including Mount Legaspi. Little is known about the altitudinal distribution of this species, but the holotype was collected at 670 m.