Natural Hybrids
In the wild, N. macrophylla is only known to hybridise with N. lowii. N. lowii × N. macrophylla was discovered on Mount Trus Madi by Johannes Marabini and John Briggs in 1983. Later that year, it was described as N. × trusmadiensis by Marabini. Briggs returned to Mount Trus Madi in 1984, but found only one small group of plants.
Nepenthes × trusmadiensis has petiolate leaves measuring up to 50 cm in length. The pitchers of this hybrid are some of the largest of any Bornean Nepenthes species, reaching 35 cm in height. They are roughly intermediate in form between those of its parent species. The lid is held away from the mouth as in N. lowii and bears short britles on its lower surface. The peristome has prominent ribs and teeth, but is not as developed as that of N. macrophylla. The inflorescence of N. × trusmadiensis may be up to 50 cm long and has two-flowered pedicels. Despite the size of the pitchers, this hybrid is not large in stature.
Nepenthes × trusmadiensis is restricted to the summit ridge of Mount Trus Madi and has been recorded from elevations of 2500 to 2600 m above sea level.
Read more about this topic: Nepenthes Macrophylla
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