Joe's Nana Mott had one of these - I remember it on her back deck. I regret not getting a cutting of it when she died. A gardening friend gave me this one - which has now multiplied & fills several hanging pots. This is a great pass-along plant, because much like a spider plant, it drops many new plantlets than can be easily rooted.
The bloom lasts only one day. Here's one popping open: