I wanted to update this thread for a few reasons:
First, to encourage more discussion and more pictures of this genus, which although unrelated to CPs, does demonstrate some similarities due to convergent evolution. I would expect many Aristolochias would intrigue those interested in CPs. Instead of pitchers, flowers are specialized to catch pollinators for a day or so through the presence of inward pointing hairs. Once the bugs are covered with pollen, the hairs shrivel, so that insects can leave and find another receptive flower to pollinate. So the trapping mechanism is for "catch and release", not digestion.
Second, I ran across an amazing paper on a variety of Aristolochia grandiflora which is the longest known flower on earth. The photos are incredible. The flowers, including the "tail" can get as big as 7.2 ft long.
Finally, I wanted to update some of the photos destroyed by Photobucket or otherwise. I couldn't find a photo of Aristolochia macroura anywhere on the forum, which is one of the coolest species.
I don't grow any Aristolochias at the moment.
First, the Aristolochia grandiflora paper:
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