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.
Nepenthes inermis
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
The Nepenthaceae of the Netherlands Indies
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"The Nepenthaceae of the Netherlands Indies" is a seminal monograph by B. H. Danser on the tropical pitcher plants of the Dutch East Indies and surrounding regions. It was originally published in the Bulletin du Jardin Botanique de Buitenzorg in 1928, and reprinted by Natural History Publications (Borneo) in 2006.
Cover showing painting of N. lowii by Sia Yek Chung
A typical line drawing from Danser's monograph, showing three herbarium specimens of the natural hybrid Nepenthes × hookeriana. The plant material illustrated includes a lower pitcher, an upper pitcher, a female inflorescence, an infructescence, and a portion of the stem. This figure was produced by Amir Hamzah, a draughtsman of the Buitenzorg Herbarium, under the direction of B. H. Danser.
Image: Nepenthes hookeriana Danser
Image: Nepenthes mollis Endert 4282