The plants were originally thought to be a form of N. truncata. I bought it under the name N. truncata 'Queen of Hearts' x 'King of Spades' (via CP Jungle) from Borneo Exotics in Sri Lanka. The plant's namesake, (Rob Cantley, owner of Borneo Exotics) helped discover this plant and was the sole propagator, introducing this plant into cultivation.
This plant may be extinct in the wild from what I've read. It is described as being "Critically Endangered." as there's always the possibility it exists in the wild elsewhere and no ones been able to find any yet. The original plants were found in the Philippine island of Mindanao. Seed was collected in 1997 to grow the parents of the plant that I have. No one has been able to find them again, as the area has since been logged. CITES restricts taking the plants, (even in the event that the area is set to be deforested) but a small amount of seed collection is one of the few things allowed. It's crazy to me that these are the laws we have to live under (I don't always agree with CITES restrictions), but I'm thrilled someone found them before they were gone forever.
N. robcantleyi will get stunningly large pitchers when mature. I can't add the photos I'd like to due to copyright, but a search for this plant will show you it's potential. Link:<Google Images Search N. robcantleyi
The plants currently being cultivated by those of us who purchased one will see some variation as you never can be 100% certain what characteristics of the parent plants the offspring will show when grown from seed. Nepenthes are either gynoecious (female plants) or androecious (male plants) so you need two to create seed as each flower will have only their sex respective flower parts.
|Here is mine today, still a juvenile.|
|Immature pitcher, but you can see the coloration|