Natural Hybrids
In Nepenthes of Sumatra and Peninsular Malaysia, Charles Clarke lists the natural hybrid N. gracillima × N. macfarlanei. At the time of the book's publication, N. alba was considered a heterotypic synonym of N. gracillima. Since then, however, N. alba has been elevated to a species. As both N. alba and N. gracillima occur on Mount Tahan, from which Clarke recorded the hybrid, it is unknown which taxon was involved in the cross.
Read more about this topic: Nepenthes Gracillima
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