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South African succulent, Stapelia a.k.a. Starfish Flower and nicknamed Carrion Flower because it has a special odour (had to use the "-our") for attracting a certain kind of fly. I forgot what it was after planting it months and months ago, and then, this!
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P.S. Somehow, I didn't take a picture of the bud, which was also way neat, but you can see one at http://home-and-garden.webshots.com/photo/1093867692044675570FxxXRJ.