IT'S A WINK AND A NOD TO THESE VIOLETS
The plant I've always thought of as Floating Violet is in full bloom at the moment after suffering badly this summer (had to prune it back ruthlessly). I'd managed to save one branch of it and that one frond hung down looking quite forlone so I wound it around inside the pot and now that it's flowering, looks nicely symmetrical. Unlike a true violet, this has no perfume. The flowers seem to float on any gentle breeze, no doubt where it gets that name. It strikes very easily from cutting too.
[Edit - 8/4/10 11pm - Thanks to a kind reader, we have the true name. It's Streptocarpus which is also known as Nodding Violet (they nod in the breeze) and related to the African Violet. More info can be found here. It also grows well as a ground cover and has been used extensively at Flemington Racecourse.]