[click on image to see a larger one]
Visible light image:

UV image:

Simulated bee vision:

Simulated butterfly vision:

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

Also this different specimen of Dandelion flower has quite a prominent UV pattern, its petals are UV bright around 365nm, its center is UV dark, especially the anthers, and this gets quite nicely visible also in simulated bee and butterfly vision.
I have written about this flower 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