[click on image to see a larger one]
Human Vision:

UV vision:

Simulated Butterfly vision:

Simulated Bee vision:

This dwarf tulip has a quite visible UV pattern, its center is UV bright, surrounded by long wave UV reflecting tips and all this gets quite nicely visible.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos