Updated with the correct spelling (thank you Glen from gardens), I find some more results, including pictures of the fruit and other information.
I visited the Frederick Meijer Gardens and Sculpture Park, Near Grand Rapids last week with my granchildren. Not too many flower shots but I saw this curiosity and chased down a staff person who was kind enough to find another staff person, and another and finally walkie talkies were used. The name I believe I was told is Dranuncula, but I can’t find much about it on the web. I was told that it’s one of the family of meat eaters that attracts its prey by smelling like carrion. It was not smelling bad yet, that I could tell. Click on the small images for a bigger one.