How about I add even more confusion for you!?
That picture by Triffid park, is quite removed from what most of the N. 'Allardii' they offer look like. *This could be due to age, form (since there are varying forms) or growing conditions.
TP say they have 2 different forms of the Allardii. *Both have striped peristomes but with varying colours. *They were even more surprised when I told them that my TP Allardia had no visible stripes on the peristome at all and was nowhere near as red in colour overall (I keep mine in high natural light equal to or greater than what TP keep them in).
Even when looking at 100ís of them during my visit last week I could see quite *a large range of variations in pitcher appearance.
Now, I think this is explained in part by the mericloning. *If I understand it correctly there must be some donor, or parent plants, here. *I then assuming they must vary slightly which gives us the variation in the Allardi clones that TP then on-sell.
The thing I guess is near on impossible to find out is where the donor/parent plants came from to start with. *I was given a lead to someone that supposedly introduced the first seed here in Aus. but I was unable to get a response about that.
I'd say Hamish pretty much summed it up, in that unless the plant is descendant from the original hybrid then it is not ACTUALLY Allardii or Tiveyii but simply a very closely parented from.