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

Reflected ultraviolet (UV):

Simulated butterfly vision:

Simulated bee vision:

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

This flower shows no very prominent UV pattern, its petals transparently shine somewhat in UV (around 385nm), and all this gets nicely visible, also in simulated bee and butterfly vision.
I have previously written about Saxifraga 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