We’ve had an interesting flower in our garden for the last couple of years called the balloon flower. You can see how it got that name from this picture:
That’s what the blossom looks like when it first appears. After about a day, it opens up and looks like this:
They produce a lot of flowers, but they’re pretty well behaved. They haven’t spread all over the place like some of the others. Although I’ve heard that some varieties of Balloon flower can do that. These appear to be a dwarf variety, they don’t get much more than 18 inches tall.