Nepenthes dubia
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Nepenthes dubia is a tropical pitcher plant endemic to the Indonesian island of Sumatra, where it grows at an altitude of 1600–2700 m above sea level. The specific epithet dubia is the Latin word for "doubtful".
Nepenthes dubia
An upper pitcher
A young climbing plant in mossy forest at around 1600 m
Numerous plants growing among stunted ridgetop vegetation
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