Nepenthes talangensis
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Nepenthes talangensis is a tropical pitcher plant endemic to Sumatra, where it grows in upper montane forest at elevations of 1800–2500 m above sea level.
Nepenthes talangensis was for a long time confused with N. bongso (freshly opened lower pitcher pictured)
Nepenthes talangensis growing in mossy upper montane forest
Nepenthes talangensis has a greatly incurved peristome that extends for only a few millimetres on the outside of the pitcher
Nepenthes inermis
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Nepenthes inermis is a tropical pitcher plant endemic to the Indonesian island of Sumatra. The specific epithet inermis is Latin for "unarmed" and refers to the upper pitchers of this species, which are unique in that they completely lack a peristome.
Upper pitchers of N. inermis from Mount Belirang
Closeup of the pitcher mouth of N. inermis. The upper pitchers of this species are the only ones in the genus to completely lack a peristome.
An upper pitcher of N. × pyriformis