This is a copy of the post Stewart Mc Pherson made on CPUK forum a few weeks ago. I have copied it here with Stewart's authorization.
"Dear Fellow CP enthusiasts,
I just returned from an expedition with Greg Bourke to study various CPs in the remote Cape York peninsula of Australia. It was a fascinating trip and the three nepenthes there are extremely interesting.
I was a little skeptical about how distinct N. rowanae and N. tenax are from N. mirabilis. However on seeing these plants in the wild, I completely agree with Charles's description. While there are so many hybrids of these three species across the swamplands of Cape York (in fact, the majority of Nepenthes we found are hybrids) the distinct species are very clearly different and easy to see in the field.
Note the spectacular colouration of the N. mirabilis. The plants in Cape York were certainly the most beautiful specimens of this species that I have seen anywhere!