Dutchmans Pipe

I believe this vine is Central American, but I found it near the back of the Herb Garden. The flower itself is about a foot long. When I turned the flower around, it had a chamber like a carnivorous plant would. The chamber is used to trap insects for just a short period of time in order to have the insect flying around inside to collect pollen or pollinate the stigma. Then it lets the insect go to pollinate more.