I don't know if there's an Aristolochia thread already, but I decided to start one. These are cool plants that are in no way carnivorous, but they do typically trap their pollinators for a day or so, releasing them when their pollen matures.
Aristolochia chilensis, first time bloom. Plant at my mom's. Origin: Annie's Annuals. All photos are of the same first flower, today, Aug. 5.