Nepenthes dubia
| Nepenthes dubia | |
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| An upper pitcher of Nepenthes dubia | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Core eudicots |
| Order: | Caryophyllales |
| Family: | Nepenthaceae |
| Genus: | Nepenthes |
| Species: | N. dubia |
| Binomial name | |
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Nepenthes dubia Danser (1928) |
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| Synonyms | |
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Nepenthes dubia /nᵻˈpɛnθiːz ˈduːbi.ə/ is a tropical pitcher plant endemic to 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 was first collected on May 29, 1917 by H. A. B. Bünnemeijer on Mount Talakmau, at an altitude of around 1900 m above sea level. Eleven years later, B. H. Danser formally described N. dubia in his seminal monograph "The Nepenthaceae of the Netherlands Indies". Danser noted similarities between N. dubia and the closely related N. inermis and suggested that it might represent a natural hybrid involving this species. He wrote:
N. dubia strongly resembles the striking N. inermis, but the difference is too large to unite these two species. N. inermis, like N. Lowii has only a rudiment of a peristome. N. dubia has a broad and flat one. There are, however, also differences in the other parts: the pitchers are less widely infundibuliform and the lid is not so narrow as in N. inermis. Perhaps N. dubia is a hybrid of N. inermis and another species with normal peristome and in that case N. Bongso could be the other parent species, the more so as the vegetative parts of N. inermis, N. dubia and N. Bongso are very similar, and between the other species of the gymnamphora-group intermediate forms often occur.
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