[2] Briggs wrote the following account of its discovery:[3][5] We were about to leave the summit around 8.00 a.m. when Johannes Marabini emerged from a dense bush [...] holding two huge pitchers quite unlike any other species.

So, after collecting a few specimens we set off down the mountain for the three-day trek back to Tambunan.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,[5][6] reaching 35 cm in height.

The lid is held away from the mouth as in N. lowii and bears short bristles on its lower surface.

[4] 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.