Nepenthes macrophylla, one of the most striking of all the highland species. You wouldn’t know it from my specimen, of course; it is still just a toddler 😉
A bit of a description of the species and its habitat, from Wikipedia:
Nepenthes macrophylla is known with certainty only from the summit area of Mount Trus Madi in Sabah, Borneo, despite the presence of a number of nearby peaks (such as Mount Pinesowitan) that fall within its altitudinal range. However, there are unconfirmed reports that it also grows “on the summit of a neighbouring peak”. Older sources list a number of different values for the altitudinal distribution of N. macrophylla, with some giving a narrow range of 2200–2400 m and others a much wider span of 2000–2600 m. It is now known that this species occurs between 2200 m and the summit at 2642 m.
The typical habitat of N. macrophylla is mossy montane forest along ridge tops, where the vegetation is dominated by Leptospermum and Rhododendron. Like most highland Nepenthes species, N. macrophylla experiences marked temperature fluctuations between day and night, from a noon maximum of around 30 °C to a nighttime minimum of 5 °C. Relative humidity is always high and in the late evening the summit of Mount Trus Madi is often shrouded in mist and clouds.
Nepenthes macrophylla occurs both terrestrially and as an epiphyte. The species is sympatric with N. lowii and N. tentaculata. A natural hybrid between N. lowii and N. macrophylla, described as N. × trusmadiensis, has been recorded.
Please see the full Wikipedia entry here, for more details and some great photos.