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

Reflected UV:

Simulated butterfly vision:

Simulated bee vision:

Quadriptych of human vision, UV, simulated butterfly and bee vision (left to right, top to bottom):

Sedum flowers have a distinct UV reflection, its petals have a quite UV dark center and the outside part is quite UV bright around 365nm and all this gets nicely visible, also in simulated bee and butterfly vision.
I have written about that flower before HERE
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