If there was a gothic King of the Nepenthes, surely N. hamata is it.
Native to central Sulawesi, N. hamata is found at fairly high elevations in the montane forests of the region at about 1900 meters. As such, it requires fairly cool conditions in cultivation, with night temperatures into the low fifties and undoubtedly the forties at times (Fahrenheit), and daytime highs rarely exceeding eighty. Coupled with consistent high humidity, these temperature limits must be observed in order to enjoy long term success with the species in cultivation. A relative newcomer to collections, N. hamata is still quite expensive to acquire, and generally what is offered are very small starter plants. If the plant is given ideal growing conditions, fairly quick growth can be expected and a decent specimen can be cultivated in as little as two years from a small tissue cultured “seedling”.
Excerpted from Wikipedia: Nepenthes hamata was first encountered by Western explorers many decades before its formal description and recognition by science. Dutch botanist Pierre Joseph Eyma collected herbarium material of this species as early as 1938; this would later be used to designate a type specimen.
In 1984, two formal descriptions of this species were published in close succession: Shigeo Kurata described it under the name N. dentata in The Gardens’ Bulletin Singapore, while John R. Turnbull and Anne T. Middleton called it N. hamatus in the journal Reinwardtia.
As explained in the introduction to his describing paper on N. dentata, Kurata first became aware of the species more than a decade earlier, on a 1972 visit to Herbarium Bogoriense:
“During my stay at the Herbarium Bogoriense in 1972, for the study of their Nepenthes collection, I was able to examine much undetermined material from several Indonesian islands. While going through those collected by P. J. Eyma in Sulawesi, I came across a very interesting Nepenthes. After subsequent study, I am now able to conclude that it should be described as a new species.”
Read more about this bizarre species on Wikipedia.