BU-1 and BU-2 are clones derived from seed that was supposedly collected from Mt. Halcon in Mindoro, Philippines, tha type localle for N. burkei. I'm still undecided about this species and actually took BU-1 and BU-2 off the market until I could be more sure I wasn't peddling N. ventricosa under another name! The size of the lid and the realtive lack of ventricose characteristic to the pitcher seem inconsistent with N. ventricosa though.
Unfortunately, taxanomic data is extremely sparse. I spoke with Charles Clarke about this briefly in Tokyo and he was undecided too.
I feel one way to decide the issue would be to go to Mt. Halcon myself and check out wht grows up there. I've been meaning to go for years and have actually been within sight of the mountain on over 30 occasions since 1991, but either typhoons or scuba diving got in the way [img]http://www.**********.com/iB_html/non-cgi/emoticons/tounge.gif[/img] Perhaps I'll make it this year.
I do now agree Jeff that your plant is probably a less mature version of the one shown in the Exotica photo. If anyone has a mature plant of either BU-1 or BU-2, I'd love to see a photo!