I have a young plant of Nepenthes aristolochioides in my greenhouse, and it has produced a fine little pitcher recently, the first in my care:
What a crazy species! Love it. (By the way, the title of this post comes from a comment Sam Estes once shared with me in regard to the aristolochioides pitcher morphology.)
Here is a superb new aristolochioides hybrid from Borneo Exotics (I believe), this time using N. belii as the female parent. This is a smart hybrid in that belii, being a warm-growing species, will make this hybrid much easier to cultivate in a cool-to-intermediate greenhouse/growspace.